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Disk replacement
StoreOnce 4900 Backup RAID configuration
The HPE StoreOnce 4900 server unit has two disks only, which are used for the operating system and
filesystem. If one disk fails, the server unit will continue to operate but the failed disk should be replaced
immediately.
The HPE StoreOnce 4900 Backup system always requires one disk enclosure with base storage of 11
disks for user data + 4 hot spare disks. These disks are configured in RAID 6 pools, such that two disks
per pool can be lost without loss of backup data. Up to five additional expansion kits may be added to the
disks in the first disk enclosure to increase the backup data capacity, also RAID 6.
One further disk enclosure can be added to the system, and is connected to the second RAID controller
card. Up to five additional expansion kits may also be added to the disks in the second disk enclosure to
increase the backup data capacity, and the storage expansion model is the same as for the first disk
enclosure.
For instructions on how to connect additional storage by installing a StoreOnce 4900 Backup 44TB or
60TB capacity expansion kit, please see the printed documentation supplied with the additional storage.
Distributing the disk drives correctly
The initial eleven disks (plus four hot-plug disks) in the disk enclosure are installed and pre-configured as
follows when the HPE StoreOnce 4900 Backup is installed.
Table 13: Disk bays populated at installation
Initial storage configuration
Disks in HPE StoreOnce 4900 44 TB Capacity Expansion kits are added to specific bays in the drawers
within the disk enclosure according to the sequence in which the disk set is being added. Each drawer
has a label that specifies the sequence in which each set of 11 disks must be installed. This sequence is
mandatory for StoreOnce software support.
Table 14: Populating disk bays with Capacity Expansion kits
+ Expansion kit 1
+ Expansion kit 2
+ Expansion kit 3
+ Expansion kit 4
+ Expansion kit 5
52
Disk replacement
Drawer 1
Two spare hot disks in bays 34
and 35 and eleven disks in slots
23-33.
Drawer 1
Do not change
Add eleven disks to slots 12-22
Do not change
Add eleven disks to slots 1-11
Do not change
Disk Enclosure 1
Drawer 2
Two spare hot disks in bays 34
and 35.
Drawer 2
Add eleven disks to slots 23-33
Do not change
Add eleven disks to slots 12-22
Do not change
Add eleven disks to slots 1-11
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