Compaq StorageWorks HSG60 ACS Solution V8.6 for SGI IRIX Installation and Configuration Guide

Planning Storage 2–3
Configuration Rules
Review these configuration rules to ensure your planned configuration meets the
following requirements and conditions:
■ Maximum of 128 LUNs: if Command Console LUN is enabled, the result is 127
visible LUNs and one CCL
■ Maximum 1.024 TB LUN capacity
■ Maximum 72 physical drives with 2 optional expansion enclosures per storage
system
■ Maximum 24 physical devices
■ Maximum 20 RAID-5 storagesets
■ Maximum 8 partitions per storageset or individual disk
■ Maximum 6 physical devices per RAID 1 (mirrorset)
■ Maximum 14 physical devices per RAID-5 storageset
■ Maximum 24 physical devices per RAID 0 (stripeset)
■ Maximum 24 physical devices per striped mirrorset
Device PTL Addressing Convention
The controller has two SCSI I/O device ports, each of which connects to a SCSI bus. In
dual-controller subsystems, these device buses are shared between the two controllers.
(SWCC calls the device ports “channels.”) The standard Model 2100-Series UltraSCSI
Controller enclosure provides a maximum of 12 SCSI target IDs for each device port.
The controller identifies devices based on a Port-Target-LUN (PTL) numbering
scheme, shown in Figure 2–1. The physical location of a device in its enclosure
determines its PTL.
■ P—Designates the controller's SCSI device port number (1 or 2).
■ T—Designates the target identification (ID) number of the device. Valid target ID
numbers for a single-controller configuration and dual-redundant controller
configuration are 0 - 5 and 8 - 13.
■ L—Designates the logical unit (LUN) of the device. For disk devices the LUN is
always 0.