HP StoreOnce 2700, 4500, 4700 and 4900 Backup System User Guide

• The HP StoreOnce 4500 Backup system has 12 disks in the storage system itself; two of these
disks (disk 1 and 2) are dedicated for use by the operating system and are in a mirrored
configuration, such that one disk can be lost without the failure of the system. The remaining
10 disks in the system are in a RAID 6 set which contains the backup data, two disks can be
lost in this system without loss of the backup data.
The HP StoreOnce 4500 Backup system can be expanded with up to three additional enclosures
of 12 disks to increase the backup data capacity. Two expansion options are available, a
24TB Capacity Upgrade Kit and a 48TB Capacity Expansion Kit. These disks are in a RAID
6 set, such that two disks per enclosure can be lost without loss of backup data. The 48TB
enclosure includes a hot spare disk in Slot 12; when not in use its LED indicators will be off
and it will show as a spare disk in the Hardware tree. This spare provides an extra level of
resiliency required with large capacity disks to allow for the longer RAID rebuild times, which
allow a larger window for multiple drive failure events. The 24TB expansion does not have
the hot spare and all disks are active in the RAID.
• HP StoreOnce 4420/4210 and 4430/4420 Backup systems all have 12 disks in the storage
system itself; two of these disks (disk 1 and 2) are dedicated for use by the operating system
and are in a mirrored configuration, such that one disk can be lost without the failure of the
system. The remaining 10 disks in the system are in a RAID 6 set which contains the backup
data, two disks can be lost in this system without loss of the backup data.
• The HP StoreOnce 4420/4210 and 4430/4420 Backup systems can be expanded with
additional enclosures of 12 disks to increase the backup data capacity, these disks are in a
RAID 6 set, such that two disks per enclosure can be lost without loss of backup data. The HP
StoreOnce 4430 supports up to four expansion shelves; daisy chaining; is not supported.
• HP StoreOnce 2700 and 2620 Backup systems have 4 disks in a RAID 5 system, the operating
system and backup data are both stored on this RAID Set. RAID 5 allows for a single drive
failure without loss of either the backup data or OS partitions.
IMPORTANT: It is very important that failed disks are replaced promptly.
In order to ensure that you are alerted to disk failures ensure that either or both of SNMP traps
and email alerts are configured so that in the event of a disk failure you are notified immediately
and can take action to replace the disks.
Note that ALL enclosures of storage must be working for the system to operate; if the RAID fails on
any one enclosure due to exceeding the maximum amount of failed disks in a pool then ALL data
is lost. In the case of the HP StoreOnce 2700 and 2620 Backup system, if more than one disk
fails then the data and operating system are lost and a “Quick Restore” of the appliance OS will
be required before the unit can be used again.
Identifying a failed disk
WARNING! Replace failed or predictive failed disks as soon as possible. Any subsequent disk
failure within the same pool or array will result in complete data loss.
Using the StoreOnce GUI
If you configured recipients for SNMP traps or email alerts, they will be notified of a disk failure.
Use the Hardware page of the GUI to find detailed information, see Hardware (page 126).
160 Storage management