Product Manual Hardware: CDA REFERENCE 77 A1 69UP 00 DPS7000/XTA NOVASCALE 7000 CDA 7 5630
DPS7000/XTA NOVASCALE 7000 CDA 7 5630 Product Manual Hardware: CDA September 1999 BULL CEDOC 357 AVENUE PATTON B.P.
The following copyright notice protects this book under Copyright laws which prohibit such actions as, but not limited to, copying, distributing, modifying, and making derivative woks. Copyright Bull SAS 1999 Printed in France Suggestions and criticisms concerning the form, content, and presentation of this book are invited. A form is provided at the end of this book for this purpose.
Preface Scope and Objectives The CDA 7 subsystem is a very reliable high performance Integrated Cached Disk Array (ICDA) designed for online data storage. The CDA 7 houses both controller and data storage capabilities in a single cabinet. As part of its effort to continuously improve and enhance the performance and capabilities of the Bull product line, Bull from time to time releases new revisions of CDA 7 5630 hardware and microcode.
CDA 7 5630 Product Manual Prerequisites For GCOS 7 systems, the CDA 7 subsystem is available with two disk technologies giving two different disk capacities: 18 GB and 36 GB. 18 GB refers to the formatted disk capacity. This is equivalent to an unformatted disk capacity of 23 GB. 36 GB refers to the formatted disk capacity. This is equivalent to an unformatted disk capacity of 47 GB.
Preface Bibliography Other EMC publications include: Symmetrix Enterprise Storage Platform Product Guide ...................................................................... P/N 200-999-556, EMC Corporation Symmetrix Open Systems Host Environment Product Guide, Volumes I and II ...................................................................... P/N 200-999-563, EMC Corporation Symmetrix Remote Data Facility Product GuideP/N 200-999-554, EMC Corporation SRDF Host Component Product Guide...........
CDA 7 5630 Product Manual DANGER: A danger warning contains information essential to avoid a hazard that can cause severe personal injury, death, or substantial property damage if you ignore the warning.
Table of Contents 1. 2. Introducing CDA 7 1.1 Versions of the Product............................................................................................... 1-1 1.2 CDA 7 Overview ......................................................................................................... 1-2 1.2.1 CDA 7 Capacities........................................................................................... 1-3 1.2.2 Channel Connectivity and Host Integration ..........................................
CDA 7 5630 Product Manual 2.4.3 2.4.4 2.4.5 2.5 3. 4. 5. Channel Attachments................................................................................................ 2-11 2.5.1 Ultra SCSI Channel Attachement ................................................................. 2-11 2.5.2 Fibre Channel Attachments .......................................................................... 2-12 CDA 7 Input/Output Operations 3.1 ICDA Operation...........................................................
A. B. 5.2 Reliability and Availability Features ............................................................................. 5-4 5.2.1 Reliable Components ..................................................................................... 5-4 5.2.2 Redundant Power Subsystem ........................................................................ 5-4 5.2.3 System Battery Backup .................................................................................. 5-4 5.2.3.
CDA 7 5630 Product Manual B.5 SCSI Cable Precautions.............................................................................................
Table of Graphics Figures 1-1. 2-1. 2-2. 2-3. 2-4. 3-1. 3-2. 3-3. 3-4. 3-5. 3-6. 3-7. 3-8. 3-9. 3-10. 3-11. 3-12. 5-1. 5-2. 5-3. B-1. CDA 7 Cabinet ............................................................................................................ 1-2 CDA 7 (Interior View) .................................................................................................. 2-2 CDA 7 Block Diagram .................................................................................................
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Introducing CDA 7 1. Introducing CDA 7 This chapter provides an overview of the Bull CDA 7 and highlights its performance and reliability features. This chapter also describes hardware and software options. • CDA 7 Overview • Channel Configurations • CDA 7 Options 1.1 Versions of the Product For GCOS 7 systems, the CDA 7 subsystem is available with two disk technologies giving two different disk capacities: 18 GB and 36 GB. 18 GB refers to the formatted disk capacity.
CDA 7 5630 Product Manual 1.2 CDA 7 Overview CDA 7 is a reliable high performance Integrated Cached Disk Array (ICDA) designed for on-line data storage. The following figure provides a front view of the exterior of the CDA 7 model. Figure 1-1.
Introducing CDA 7 1.2.1 CDA 7 Capacities The CDA 7 is available with various numbers of disk devices and storage capacities. CDA 7 can host both system and user data. In a GCOS 7 environment, diskmodules are 18 formatted capacity. The 18 GB physical disks have to be split into two 9 GB logical disks. The larger capacity models are particularly suitable in a shareable context with Open Systems. Table 1-1 outlines the CDA 7 model capacities when the CDA 7 is attached to a DPS 7000 system host.
CDA 7 5630 Product Manual 1.2.2 Channel Connectivity and Host Integration The CDA 7 supports connectivity • To the Bull DPS 7000/GCOS 7 through Ultra SCSI channels, • To Open Systems, when Enterprise Storage Platform (ESP) software is added, through Ultra SCSI or Fibre channels. The CDA 7 channel directors are available with the following ports: • 4-port Ultra SCSI directors, • 2-port Fibre Channel directors.
Introducing CDA 7 1.2.3 Performance Features CDA 7 offers improved performance over conventional Storage Control Units (SCU). These CDA 7 features enhance performance and increase throughput: • Large non-volatile cache • Asynchronous I/O • Multiple storage directors • Parallel processing • 100% Fast Write capabilities • Rotation Position Sense (RPS) miss elimination • Segmented device-level buffer • Ultra SCSI channel speeds up to 40 MB/sec • Fibre Channel speeds up to 100 MB/sec 1.2.
CDA 7 5630 Product Manual 1.2.5 Serviceability Features Every CDA 7 unit has an integrated service processor that continuously monitors the CDA 7 environment. The service processor communicates with the Bull Competence Centers via a customer-supplied, direct phone line. It automatically dials the Customer Support Center whenever CDA 7 detects a component failure or environmental violation.
Introducing CDA 7 1.3 CDA 7 Options Bull offers the following hardware and software options for the CDA 7. Consult your Bull Systems Engineer for the latest information on these options. 1.3.1 Hardware Option 1.3.1.1 Phone Multiplexer Bull offers a Phone Multiplexer for domestic customer sites with multiple CDA 7 units (Integrated Remote Adaptor). The CDA 7 Phone Multiplexer consists of a PBX with a Direct Inward Systems Access (DISA) board set that switches incoming calls to the correct CDA 7 unit.
CDA 7 5630 Product Manual 1.3.2 Software Options The following software options are used: • Enterprise Storage Platform (ESP) • Remote Data Facility (SRDF) 1.3.2.1 CDA 7 Enterprise Storage Platform (ESP) CDA 7 ESP software enabler is a software option that allows simultaneous storage and access of mainframe data and open systems data on the same CDA 7 system. Data must reside on separate physical disks for each platform in the system.
CDA 7 Hardware 2. CDA 7 Hardware This chapter describes the main hardware components of the CDA 7 including: • Major Components • Operator Panel • Disk Devices and SCSI Disk Emulation • Directors and Cache • Channel Attachments 2.1 Major Components The CDA 7 is a disk subsystem that houses all Storage Control Unit functions and Disk in a single cabinet.
CDA 7 5630 Product Manual The following figures show the location of the main components of the CDA 7 . DISK DEVICES FAN ASSEMBLIES SERVICE PROCESSOR ADAPTER CARDS REAR Open Position BATTERY SUBSYSTEM Closed Position DIRECTOR AND CACHE CARDS FRONT POWER SUBSYSTEM INTERNAL ETHERNET HUB Figure 2-1.
CDA 7 Hardware 2.1.1 Component Location These components have the following functions: Cooling Fan Modules Contains fans for maintaining air circulation and cooling the unit internally. Card Cage and Backplane Contains eight slots to accommodate director, cache, and adapter cards. The directors and cache cards connect to the front of the backplane. The adapter cards connect to the rear of the backplane. Disk Devices Contain up to 32 x 3.5-inch disk-devices for data storage.
CDA 7 5630 Product Manual Integrated Service Processor Downloads the CDA 7 configuration to the directors and provides diagnostic and maintenance utilities for CDA 7. It connects to the CDA 7 subsystem via an RS-232 interface and uses an external modem for communicating with the Bull Competence Center when CDA 7 detects an error condition. Dual Power Cords EMC offers dual power cords on the CDA 7. This allows you to connect the power subsystem to two dedicated or isolated power lines.
CDA 7 Hardware 2.1.2 CDA 7 Block Diagrams The following figure illustrates the interconnection of the major components of the CDA 7 .
CDA 7 5630 Product Manual 2.2 Operator Panel This section describes the functions of the various operator panel components. The CDA 7 operator panel is located at the top of the front door. It has two displays: one for the disk directors and one for the channel directors. The operator panel shows the current activity of each channel director. The following figure shows an example of the operator panel.
CDA 7 Hardware 2.2.2 Channel Director Display The channel director display is located on the right side of the operator panel. There is a separate display for each channel director. The operator panel displays the current activity and status of each channel director. The switches control physical channel on-line/off-line activity. The channel director display components function as follows for the channel directors: POWER Light indicating that the CDA 7 operator panel is powered on.
CDA 7 5630 Product Manual 2.3.1 FBA Data and Command Format FBA disk devices store data in fixed sized blocks (typically 512 bytes). A disk device using FBA format is viewed as a large array of blocks. The physical position of the block (cylinder and track) is usually not significant to the host. When requesting disk access for read or write, the host addresses the device by the logical block address (LBA) of the starting block and a count of the total blocks needed.
CDA 7 Hardware 2.4 Directors and Cache This section describes the CDA 7 directors and cache capacity. The channel directors and cache manage the storage control functions. The disk directors handle the data storage functions. 2.4.1 Ultra SCSI Channel Director The Ultra SCSI director is a single card that occupies one slot on the CDA 7 backplane. Each SCSI director interfaces to the host channels via a SCSI adapter connected to the opposite side of the backplane.
CDA 7 5630 Product Manual NOTE: For more information, call your Bull Sales Engineer. 2.4.4 Disk Director The CDA 7 disk director provides an interface between cache and the disk devices. The CDA 7 contains two disk directors. Each director, with its two advanced microprocessors, supports up to sixteen 23 or 47 GB 3.5-inch disk devices— one to four disk devices per SCSI bus (C, D, E, and F).
CDA 7 Hardware 2.5 Channel Attachments 2.5.1 Ultra SCSI Channel Attachement CDA 7 can attach to Ultra SCSI channels and Fibre Channels, or a mix of channel types. The physical connection to a CDA 7 SCSI channel interface occurs at the connectors on the channel adapters. The following figure illustrates the type of SCSI attachments. DIFFERENTIAL WIDE SCSI HCST ULTRA FAST-WIDE SCSI DIRECTOR Figure 2-4.
CDA 7 5630 Product Manual 2.5.2 Fibre Channel Attachments The CDA 7 Fibre Channel adapter provides an interface between the director and host channels. Each Fibre Channel adapter is located at the rear of the backplane, opposite its corresponding channel director. These adapters provide the connectivity between the host channels and the Fibre Channel directors (FC-0 layer of the Fibre Channel standard).
3. CDA 7 Input/Output Operations This chapter describes input/output operations between the CDA 7 and a host system. • Integrated Cached Disk Array Operation • Elements of a CDA 7 I/O Operation 3.1 ICDA Operation Integrated Cached Disk Array operation is based on the principle that the currently active data at any given time is relatively small when compared to the total subsystem storage capacity. If this data is in cache, there is a significant improvement in performance.
CDA 7 5630 Product Manual Data Reuse If a given piece of information is used, there is a high probability that it will be reused shortly thereafter. This cache principle has been in use for years on host systems (CPU and storage devices). The following figure illustrates this type of host cache use. The cache used in this manner is often a high speed, high cost storage unit used as an intermediary between the CPU and main storage. HOST CACHE CPU Figure 3-1. 3.1.
CDA 7 Input/Output Operations 3.1.1.1 LRU Algorithm The directors replace the least recently used data in cache with new data when needed. The LRU algorithm optimizes cache performance through high hit ratios by ensuring that the most appropriate data is stored in cache. The following figure illustrates data flow with the LRU algorithm. NEWLY STAGED CACHE SLOT PROMOTED TO TOP READ or WRITE HIT CACHE CAPACITY OLDEST SLOT Figure 3-2.
CDA 7 5630 Product Manual 3.1.1.2 Prefetch Algorithm The Prefetch algorithm dynamically detects sequential data access patterns to the disk devices. The directors improve the hit ratio of these accesses by promoting blocks from the disk devices to cache slots before a read miss can occur. The Prefetch algorithm can stage between a single block and a full track of data to a cache slot. The LRU algorithm adds the cache slot to the top of the LRU list.
CDA 7 Input/Output Operations CDA 7 uses these techniques to enhance its performance: Split Director Functions The director operations are split into two functional parts, the channel director and disk director. The channel director services requests from the host. The disk director services requests between cache and disk. Splitting the director functions eliminates the processing overhead and cache locking associated with Control Units that perform both functions.
CDA 7 5630 Product Manual 3.2 Elements of a CDA 7 I/O Operation All I/O operations require a certain response time. An I/O request begins with the application issuing an I/O command and ends when the transfer completes. The time lapse from I/O request to transfer completion is the I/O response time. 3.2.1 I/O Response Time The I/O response time can be divided into a host queuing time, a command connect time, a disconnect time, and a data connect time, as shown in the following figure.
CDA 7 Input/Output Operations 1 Cache Directory Search - Hit 2 Transfer to Host 3 Update Directory CHANNEL 1 2 CHANNEL 1 3 DIRECTORY 3 CHANNEL DIRECTOR CACHE 1 Cache Directory Search - Miss 2 Position R/W Head, Stage Data to Cache 3 Transfer to Host 4 Update Directory DIRECTORY 4 CHANNEL DIRECTOR CACHE DISKS DISK DIRECTOR DISKS 2 DISK DIRECTOR READ HIT 1 Cache Directory Search - Hit 2 Transfer to Cache 3 Update Directory 4 Asynchronous Destage CHANNEL 2 READ MISS CHANNEL 4 1 DIRECTORY
CDA 7 5630 Product Manual In addition to the four types of I/O operation mentioned, CDA 7 performs a background operation that "destages" "written-to" blocks back to disk. The following figure illustrates this "destaging" operation. CHANNEL 1 Destage Block(s) 2 Up date Directory DIRECTORY CHANNEL DIRECTOR CACHE 1 2 DISKS DISK DIRECTOR Figure 3-6. Destaging Operation CDA 7 performs read operations from cache. CDA 7 always caches write operations.
CDA 7 Input/Output Operations 3.2.2 Read Operations There are two types of read operations: read hit and read miss. The following figure illustrates the data flow for read operations. CHANNEL CHANNEL CHANNEL DIRECTOR CHANNEL DIRECTOR CACHE CACHE READ HIT DISKS READ MISS Figure 3-7.
CDA 7 5630 Product Manual 3.2.2.1 Read Hit In a read hit operation (following figure), the requested data resides in cache. It is transferred directly to the host computer through the channel interface. CONNECT TIME OVERHEAD TOTAL SERVICE TIME Figure 3-8. Read Hit Since the data is in cache, there are no mechanical delays due to seek, latency, and RPS miss.
CDA 7 Input/Output Operations 3.2.2.2 Read Miss In a read miss operation, the requested data is not in cache and must be retrieved from a disk device. While the channel director creates space in the cache, the disk director reads the data from the disk device. The disk director stores the data in cache as the channel director simultaneously transfers the cached data to the host.
CDA 7 5630 Product Manual The following figure illustrates the data flow for write operations. CHANNEL CHANNEL DIRECTOR CACHE ASYNCHRONOUS DESTAGE DISKS READ WRITE Figure 3-10.
CDA 7 Input/Output Operations 3.2.3.1 Fast Write In a fast write operation, the channel director stores the data in cache and sends a channel end and device end (or a SCSI "good ending" status) to the host computer. The disk director then asynchronously "destages" the data from cache to the disk device. CONNECT TIME OVERHEAD TOTAL SERVICE TIME Figure 3-11. Fast Write Since CDA 7 writes the data directly to cache and not to disk, there are no mechanical delays due to seek, latency, and RPS miss.
CDA 7 5630 Product Manual 3.2.3.2 Delayed Fast Write In a delayed fast write operation, CDA 7 cannot store the data in cache until space in cache becomes available. A delayed fast write condition can only happen if the cache allocated for writes is currently full with data yet to be "destaged" to the disk devices. The default cache write ceiling is 80% of the cache. CONNECT TIME OVERHEAD DISCONNECT TIME TOTAL SERVICE TIME DELAY Figure 3-12.
4. Performance Features CDA 7 offers improved performance over conventional Storage Control Units and disk device designs. The CDA 7 features described below allow high cache hit ratios and less processing overhead, reducing response time and improving throughput. 4.1 Cache A cache size of up to 8,192 MB and intelligent caching algorithms greatly improve hit ratios and overall subsystem response time. CDA 7 caches all read and write operations making them transparent to the host operating system. 4.
CDA 7 5630 Product Manual 4.4 Fast Write Capabilities CDA 7 caches write operations, eliminating the need to write data to the disk immediately. This results in faster response times and improved overall subsystem performance. The write ceiling is 80% of the usable cache. Channel directors and disk directors dynamically allocate cache space between reads and writes depending on I/O activity. 4.
5. Managing Critical Data This chapter discusses the CDA 7 features and options that affect data availability and reliability. • CDA 7 Data Management Overview • Reliability and Availability Features • Data Integrity Protection • Data Protection Guidelines • Mirroring 5.1 CDA 7 Data Management Overview CDA 7 has many features and options to ensure a high degree of system and data availability. Many of these features and options are built into the CDA 7 design.
CDA 7 5630 Product Manual These basic CDA 7 features provide protection against loss of system and data availability due to a power loss or failed component. A redundant design allows CDA 7 to remain online and operational during component repair. For example, if a power supply fails, the remaining power supplies share the load until the failed component is replaced. The system battery backup prevents any loss of data due to a power failure.
Managing Critical Data 5.1.3 Data Protection Options Although the CDA 7 has standard features that provide a higher level of data availability than conventional disk, the options listed below ensure an even greater level of data recoverability and availability. You can choose from the following CDA 7 data protection options to match your critical data requirements: • RAID-1 Mirroring • CDA 7 Remote Data Facility (SRDF) 5.1.3.
CDA 7 5630 Product Manual 5.2 Reliability and Availability Features CDA 7 has several features that allow it to maintain data integrity and maximize system availability. This section discusses several features in detail. 5.2.1 Reliable Components CDA 7 uses components that have a mean time between failure (MTBF) of several hundred thousand to millions of hours for a minimal component failure rate. A redundant design allows CDA 7 to remain online and operational during component repair.
Managing Critical Data The backup battery subsystem allows CDA 7 to remain online to the host system for three minutes in the event of an AC power loss. This three minute window allows CDA 7 to support frequent power outages because the battery is able to fully recharge during Initial Microcode Load (IML) time. CDA 7 continually recharges the battery subsystem whenever it is under AC power.
CDA 7 5630 Product Manual This sophisticated fencing mechanism determines a disk management hardware failure at two levels: 5-6 Level 1: a director discovers through use of its online self-testing that one of its SCSI paths is failing. The director signals CDA 7 of this condition and the director it is paired with automatically takes control of the failing path. Level 2: CDA 7 determines a director has failed and fences it out.
Managing Critical Data TO/FROM MEMORY DISK DIRECTOR 1 DISK DIRECTOR 2 PROCESSOR A PROCESSOR B PROCESSOR A PROCESSOR B PC PD SC SD PC PD SC SD PC PD SC SD PC PD SC SD DISKS DISKS DISKS DISKS DISKS DISKS DISKS DISKS PC = PRIMARY C BUS PD = PRIMARY D BUS SC = SECONDARY C BUS SD = SECONDARY D BUS Figure 5-1.
CDA 7 5630 Product Manual In the following examples, disk director 1 and disk director 2 are paired. Each CDA 7 disk director services 16 disk devices. EXAMPLE 1: Disk director 1 fails. Disk director 2 automatically performs any I/O operations with all of the devices normally serviced by disk director 1 as well as all its own disk devices with no interruption in processing. ❑ EXAMPLE 2: On disk director 1, processor A, primary SCSI bus C fails. On disk director 2, processor B, primary SCSI bus D fails.
Managing Critical Data In summary, dual-initiator provides the following advantages: • Ensures continuous data availability if a CDA 7 disk management component fails • Provides continuous operation by switching data pathing to the alternate disk director without interruption when a communications failure occurs with one or more disk devices • Re-establishes normal data pathing after repair of the defective component Dual-initiator provides an additional level of data availability in mirrored configurat
CDA 7 5630 Product Manual 5.2.6 Microcode Upgrades and Loads Microcode upgrades, performed by the Product Support Engineers (PSE) at the Bull Competence Center, allow you to take advantage of enhancements to performance algorithms, error recovery and reporting techniques, diagnostics, and microcode fixes. It is possible to upgrade the microcode from one level to an adjacent level. Problems can happen when upgrading to a much higher microcode level. 5.2.6.
Managing Critical Data 5.2.6.2 Dynamic Reconfigurations CDA 7 supports dynamic reconfiguration activity without disruption to online applications, such as: • Establish/de-establish mirrored pairs. • Modify channel assignments. 5.2.6.3 Online SCSI-to-Fibre Channel Migration Beginning with CDA 7 microcode revision 5265, CDA 7 systems with SCSI channel directors can be upgraded to Fibre Channel directors without taking nonSCSI channels offline and without requiring a backup and restore of data.
CDA 7 5630 Product Manual 5.3 Data Integrity Protection CDA 7 preserves data integrity by performing extensive error checking and correction on all data and addresses it passes internally. 5.3.1 Error Checking, Correction, and Data Integrity Protection In conventional disk, the subsystem adds error checking and correction bytes to each data record field, as shown in the following figure. It uses these error checking and correction bytes to check the data and correct it if possible.
Managing Critical Data 5.3.1.1 Parity All data and control paths have parity generating and checking circuitry that verify hardware integrity at the byte level. 5.3.1.2 ECC The directors detect and correct single-bit and double-bit errors and report uncorrectable 3-bit or more errors in cache. 5.3.1.3 LRC The LRC calculation further assures data integrity. The check bytes are the XOR (exclusive OR) of the accumulated bytes.
CDA 7 5630 Product Manual 5.3.3 Cache Error Correction and Error Verification The disk directors use idle time to periodically read cache, correct single-bit errors (one hard and one soft), and write the corrected data back to cache. This process is called “error verification.” When the directors detect an uncorrectable error in cache, CDA 7 reads the data from disk and takes the defective cache memory block offline until an Bull Customer Engineer can repair it.
Managing Critical Data 5.5 Mirroring Mirroring provides the highest level of performance and availability for all mission critical and business critical applications. Mirroring maintains a duplicate copy of a logical volume on two physical disk devices. CDA 7 maintains these copies internally by writing all modified data to both devices. The mirroring operation is transparent to the host.
CDA 7 5630 Product Manual 5.5.3 Error Recovery with Mirroring Should one volume in the mirrored pair fail, CDA 7 automatically uses the other volume without interruption. CDA 7 notifies the Bull Competence Center of this condition. When the defective device containing the volume is replaced, CDA 7 re-establishes the mirrored pair and automatically copies data to the new disk. During the copy operation, CDA 7 gives priority to host I/O requests over copying to minimize the effect on performance.
Managing Critical Data In case of disaster occuring at the Production Site, the back-up procedures entitle the Back-up Site to take over the application workload and to resume the production tasks thanks to the remote copy of user’s databases and system data.
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A. Power Sequences This Appendix provides step-by-step instructions for powering the CDA 7 on and off. The unit is powered on and off via the power switches on the rear door of the unit. • • • • A.
CDA 7 Product Manual 4. When the IML procedure completes (all directors show "0F" in their LED displays on their front panels), place the operator panel switches (channel director and disk director) in their enable position. When "0F" clears from all director LED displays, the CDA 7 is then available to the host system(s). A.2 Routinely Powering Down CDA Perform these steps to power off the CDA 7 using the AC power switch. 1. Stop all processes to the CDA 7. 2.
Power Sequences A.4 Powering Up After an Emergency Shutdown CAUTION: This unit contains no user-serviceable parts, so it should not be opened for any reason by untrained personnel. If the CDA 7 is in need of repair, only qualified personnel familiar with safety procedures for electrical equipment and the CDA 7 should access components inside the unit. When the CDA 7 is powered down via the red EPO switch, a breaker switch on the power subsystem trips.
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B. ESP Installation Requirements This Appendix covers the tasks you need to perform when planning or verifying the physical configuration of CDA 7 in your system or creating I/O addressing schemes. B.1 CDA 7 Hardware Checklist Make sure you discuss with and obtain the following site profile information with the Customer Engineer and/or Systems Engineer. This information is necessary for each CDA 7 subsystem you are installing (following table). Table B-1.
CDA 7 5630 Product Manual B.2 Open Checklists for ESP Connection Make sure you discuss with and provide the following host information to the Customer Engineer and/or Systems Engineer. This information is necessary for each host you are attaching to the CDA 7 subsystem. Make a copy of this form for each host you will attach to CDA 7. When you are done you should have a checklist for each host. Table B-2.
ESP Installation Requirements Table B-2.
CDA 7 5630 Product Manual B.3 SCSI Cable Worksheet The physical connection to a Ultra channel interface occurs at the connectors on the SCSI adapters located at the rear of the CDA 7 unit. When connecting to hosts with differential Ultra or differential narrow SCSI interfaces, use differential P-cables that are designed for wide SCSI applications (see labeling on cable). NOTE: For a list of the Ultra SCSI cables available from Bull, refer to the manual CDA 7 Site Preparation.
ESP Installation Requirements B.4 ULTRA SCSI Channel Adapters Several Fast-Wide / Ultra SCSI adapters are available in CDA 7, depending on the host channel connection requirements, such as terminated and non-terminated channels, and Y-cable cluster configurations. NOTE: Contact your Bull Sales Representative to obtain SCSI adapter part numbers. For cluster configurations, refer to the Symmetrix High Availability Environment Product Guide. B.
CDA 7 5630 Product Manual Four-Port Dual-Processor, Ultra SCSI Director SDA Operator Panel Designations C Physical Channel Designations SA-1, SIDE B, PORT A A B-SIDE B D SA-1, SIDE B, PORT B HOST CHANNELS A SA-1, SIDE A, PORT A B X-BUS A SA-1, SIDE A, PORT B B ADAPTER Figure B-1.
Glossary This glossary contains terms related to disk storage subsystems. Many of these terms are used in this manual. A Actuator A set of access arms and their attached read/write heads, which move as an independent component within a head and disk assembly (HDA).
CDA 7 5630 Product Manual B Backplane Card that accommodates the director, cache, and adapter cards. Bit The smallest unit of computer memory. A bit can hold a value of 0 or 1. Byte Term that indicates an 8-bit hexadecimal construction. C Cache Random access electronic storage used to retain frequently used data for faster access by the channel. Cache Slot Unit of cache equivalent to one track.
Glossary Diagnostics System level tests or firmware designed to inspect, detect, and correct failing components. These tests are comprehensive and self-invoking. Differential Interface An electrical signal configuration that uses a pair of lines for transfer. This configuration (as compared to a single-ended interface) has a higher tolerance for common-mode noise and little crosstalk when used with twisted pair cables. It supports cables lengths to 25 meters (82 feet). See also Single-ended Interface.
CDA 7 5630 Product Manual F Fast Write In Symmetrix, a write operation at cache speed that does not require immediate transfer of data to disk. The data is written directly to cache and is available for later destaging. FBA Fixed Block Architecture. Disk device data storage format using fixed size data blocks. Fibre channel Fibre channel speeds up to 100 MB/sec. Field Replaceable Unit (FRU) A component that is replaced or added by service personnel as a single entity. G Gigabyte (GB) 109 bytes.
Glossary Index Point The reference point on a disk surface that determines the start of a track. IOCP Input/Output Configuration Program. I/O Device An addressable input/output unit, such as a disk device. IPL Initial Program Loading. K Kilobyte (K) 1024 bytes. L Least Recently Used Algorithm (LRU) The algorithm used to identify and make available the cache space by removing the least recently used data. Logical Unit A physical or virtual device addressable through a target.
CDA 7 5630 Product Manual M Media The disk surface on which data is stored. Megabyte (MB) The MB2 value is based on the convention: 1 MB = 1024x1024 bytes. The MB10 value is based on the convention: 1 MB = 1000x1000 bytes. Mirrored Pair A logical volume with all data recorded twice, once on each of two different physical devices. Mirroring The Symmetrix option that maintains two identical copies of a designated volume on separate disks. Each volume automatically updates during a write operation.
Glossary Record Zero The first record after the home address. Reselect The function that occurs when a target disconnects from an initiator in order to perform a timeconsuming function and, then after performing that function, reestablishes the connection. Reserved The term used for bits, bytes, fields, and code values that are set aside for future standardization. S SCSI Small Computer System Interface. SCSI Adapter A circuit board used to interface the SCSI bus with an internal bus.
CDA 7 5630 Product Manual SRDF for GCOS 7 This is a disaster recovery solution that maintains a mirror image of data in two CDA 7 5330-23 subsystems that are located in physically separate sites. Stage The process of writing data from a disk device to cache. See also the term "Destage". Storage Control Unit (SCU) The component in the Symmetrix subsystem that connects Symmetrix to the host channels. It performs channel commands and communicates with the disk directors and cache. See also Channel Director.
Glossary V Volume A general term referring to a storage device. In the Symmetrix subsystem, a volume corresponds to single disk device. W WSP Wide SCSI Processor.
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Index A Active LED 2-7 Actuator Definition G-1 Adapter Definition G-1 ADT Definition G-1 Alternate Track Definition G-1 ANSI Definition G-1 Asynchronous Transmission Definition G-1 Attachments SCSI Channel 2-11 Availability Dual-initiator 5-2 Features 1-5, 5-1, 5-4 Non-disruptive Component Replacement 5-9 Redundant Power Subsystem 5-4 Upgrades and Loads 5-10 B Backplane 2-3 Definition G-2 Battery Usage in Power Failure Battery Subsystem 2-3 Bit Definition G-2 77 A1 69UP Rev00 5-5 Bull Competence Center
CDA 7 5630 Product Manual ESP Connection B-2 Hardware Checklist B-1 Major Components 2-1 Mirroring 5-16 Overview 1-2 Performance Features 1-5, 4-1 Phone Multiplexer 1-7 Powering Down A-2 Powering Up A-1, A-3 Reliability and Availability 5-1, 5-4 SCSI Cable Worksheet B-4 Serviceability Features 1-6 Channel CDA 7 Configurations 1-4 Channel and Device End 3-11 Connection Precautions B-5 Director Display 2-7 Interfaces B-5 Power Failure (Open System) 5-5 SCSI Adapters B-5 SCSI Attachments 2-11 SCSI Director 2-
Index Fencing Mechanism 5-6 With Mirrored Configurations 5-9 Dynamic Path Reconnection G-3 Reconfiguration 5-11 Sparing G-3 Dynamic Mirror Service Policy 4-2 E ECC 5-13 Emergency Power Off Procedure A-2 Powering Up After Shutdown A-3 Enable/Disable Switch 2-7 Enterprise Storage Platform (ESP) 1-8 EPO Definition G-3 EREP File 5-14 Error Checking 5-12 Checking Cache 5-14 Checking LRC 5-13 Checking Parity 5-13 Correcting Cache 5-14 Correcting Parity 5-13 Correction 5-12 Detection 5-12 ECC 5-13 Verification G
CDA 7 5630 Product Manual Definition G-4 ID Definition G-4 IML Definition G-4 Index Marker Definition G-4 Index Point Definition G-5 Integrated Cached Disk Array 3-1 IOCP Definition G-5 IPL Definition G-5 L LEDs Power 2-7 Ready/Active 2-7 Loads Microcode 5-10 Logical Unit G-5 Unit Number G-5 Volume G-5 Volume Manager G-5 Long Miss Definition G-5 LRC Definition G-5 Description 5-13 Usage 5-12 LRU Algorithm 3-3 Definition G-5 LUN Definition G-5 LVM Definition G-5 Battery Subsystem 2-3 Bus and Tags Connec
Index Cache 4-1 CDA 7 4-1 Fast Write Capabilities 4-2 Multiple Channel Directors 4-1 Parallel Processing 4-1 RPS Miss Elimination 4-2 Physical Partition Definition G-6 Power Emergency Power Off A-2 Failure on Open System Channels 5-5 LED 2-7 Powering Down A-2 Powering Up A-1 Powering Up After Emergency Shutdown A-3 Redundant Subsystem 5-4 Subsystem 2-3 PP Definition G-6 Prefetch Algorithm 3-4 Primary Track Definition G-6 Promotion Definition G-6 Protection Error Verification 5-2 Guidelines 5-14 Mirroring 5
CDA 7 5630 Product Manual Definition G-7 SIO Definition G-7 Slots Cache 2-10 Soft Error Thresholds 5-13 Speed Channel 4-2 SRDF Definition G-7 for GCOS 7 G-8 Remote Link Director 2-9 SRDF for GCOS 7 5-16 Stage Definition G-8 Storage Control Unit Definition G-8 Storage Directors 4-1 Striping Definition G-8 Switches Enable/Disable 2-7 Synchronous Transmission Definition G-8 System Battery Backup 5-4 System Check Tests 5-2 U Ultra SCSI Channel Adapters B-5 Channel Attachment 2-11 Channel Director 2-9 Definiti
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