HP StoreEasy 1000 Administrator's Manual page 94

configuration. Please select pool configuration with less than 12
drives for better data durability. For more information, see the
administrator guide.
HPE recommends to keep 12 or less drives in a pool. When a drive fails in an array, all
logical drives in that array are affected. After a drive failure, additional activities are required
to rebuild the array and these activities might cause additional drive failures. With the number
of drives in an array, the chances for drive failures increases.
CAUTION:
might be unprotected from a drive failure for an extended period during data recovery or a
drive capacity upgrade. To avoid drive failure, you must perform rebuild operations only
during periods of minimal system activity.
When you select a pool configuration that has a usable capacity of more than 64 TB, the
system displays the following message: This configuration might result in
NTFS volumes greater than 64 TB and affect the NTFS capabilities.
Do you want to continue? For more information, see the administrator
guide.
When you create NTFS volumes that are greater than 64TB, a degradation of capabilities
for managing the volume occurs. Deduplication and shadow copying support only up to a
64TB NTFS volume.
Pool Management Best Practices
Pools cannot span enclosures due to the following factors:
◦
During a drive failure, the chance for another drive failure increases due to the amount
of additional activity on the drives during the transition to a spare. When the drive is
replaced, the RAID controller has to touch each drive in the logical volume again to
re-establish the RAID parity.
◦
More drives in a pool increases the amount of time required to complete parity
initialization. Until the parity initialization completes, the performance of the array is
impacted due to the additional activities. During a drive failure, the chance of another
drive failure increases due to the additional activities on the drives during the transition
to a spare. Also, when the drive is replaced, the RAID controller has to touch each drive
in the logical volume again to re-establish the RAID parity.
◦
More drives in a pool increases the amount of time required to complete parity
initialization. Until the parity initialization completes, the performance of the array is
impacted due to the additional activities.
Where applicable, the use of a hot spare is enforced.
When using midline SAS and SATA drives, use the recommended RAID levels, RAID 6 or
RAID 60.
The available pool sets vary depending on the type of enclosure. A pool set defines how the
available physical drives may be used to form pools. For example, if an enclosure contains
23 available drives, one pool set may offer a single 22-drive pool with one drive designated
as a spare. Another pool set may offer two 11-drive pools with drive designated as a spare,
which is available to either pool.
94 Managing HPE StoreEasy 1000 Storage
As data rebuild time operates at the rate of 200GB/15 minutes, the system