HPE STOREONCE 5500

Disk replacement
Overview
This chapter describes:
• The storage RAID configuration
• How to identify a failed disk
• How to replace a disk
• How to rebuild the RAID if several disks fail
NOTE:
For instructions on how to connect additional storage by installing a StoreOnce 5500 System 44TB or
60TB capacity expansion kit, see the printed documentation supplied with the additional storage.
RAID configuration
Overview
The StoreOnce System head 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 StoreOnce 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.
Three further disk enclosures can be added to the system. The first additional disk enclosure is connected to
the second RAID controller card. The second and third disk enclosures are daisy-chained, so that up to two
disk enclosures may be connected to each RAID card. Up to five additional expansion kits may also be added
to the disks in each additional disk enclosure to increase the backup data capacity, and the storage expansion
model is the same as for the first disk enclosure.
Hot spare disks for the 5500 and 6600 disk enclosures
There are two hot spare disks in each drawer of the disk enclosure, bays 34 and 35. If a data disk fails, the
hot spare disk is automatically used until the failed disk is replaced. The disk is only returned to its status of
hot spare disk when the data is fully rebuilt on the replacement disk. The hot spare disks maintain RAID 6
redundancy for the volumes within each drawer when a drive has failed. However, it is important to replace
failed or predictive failing disks as soon as possible. If more than two disks fail in the same RAID volume, the
system will fail and data will be lost.
StoreOnce disk bay locations for 5500, 6500, and 6600 disk enclosures
The following drawing identifies disk bay locations within a drawer.
Disk replacement 37