HP XP7 Storage - Manual (Page 56)

Requirements Items
• Volumes whose LDEV status is other than Normal or Normal (Quick Format)
You cannot specify volumes in blocked status or volumes in copying process.
• Command devices
The following pool-VOLs cannot exist in the same pool:
• Internal volumes with external volumes whose cache mode is disabled.
•
External volumes whose cache mode is enabled and external volumes whose cache mode
is disabled.
3390-V Emulation type
All RAID levels of pool-VOLs can be added. Pool-VOLs of RAID 5, RAID 6, RAID 1, and the
external volume can coexist in the same pool. For pool-VOLs in the same pool: RAID level for a Thin
Provisioning Z pool
• RAID 6 is the recommended RAID level for pool-VOLs, especially for a pool where the recovery
time of a pool failure due to a drive failure is not acceptable.
•
Pool-VOLs of the same drive type with different RAID levels can coexist in the same pool.
Note that HP recommends that you use the following configuration:
◦
Set one RAID level for pool-VOLs.
If you register pool-VOLs with multiple RAID levels, the I/O performance depends on the
RAID levels of pool-VOLs to be registered. In that case, note the I/O performance of the
disks.
• Pool-VOLs on external volumes cannot have a mix of cache modes set to enable and disable.
•
For internal and external pool-VOLs to coexist, the cache mode of the external volume must
be set to enable.
All RAID levels of pool-VOLs can be added. Pool-VOLs of RAID 5, RAID 6, RAID 1, and the
external volume can coexist in the same pool. RAID level for a
Smart Tiers Z pool
For pool-VOLs in a pool:
•
RAID 6 is the recommended RAID level for pool-VOLs, especially for a pool where the recovery
time of a pool failure due to a drive failure is not acceptable.
• Pool-VOLs of the same drive type with different RAID levels can coexist in the same pool.
Note that HP recommends that you use the following configuration:
◦
Set one RAID level for pool-VOLs.
If you register pool-VOLs with multiple RAID levels, the I/O performance depends on the
RAID levels of pool-VOLs to be registered. In that case, note the I/O performance of the
disks.
•
If pool-VOLs are external volumes, set the cache mode to Enable.
SAS15K, SAS10K, SSD, SAS7.2K, and SSD. Data drive type for
for a Thin
Provisioning Z pool
Up to three different drive types of pool-VOLs can be registered in the same pool.
Cautions:
• If multiple pool-VOLs with different drive types are registered in the same pool, the I/O
performance depends on the drive type of the pool-VOL to which the page is assigned.
Therefore, if different drive types are registered in the same pool, ensure that the required
I/O performance is not degraded by using less desirable drive types.
SAS15K, SAS10K, SAS7.2K, SSD, and the external volume can be used as the data drive type.
These data drive types can coexist in the same pool. Data drive type for a
Smart Tiers Z pool
Internal volume: From 8 GB to 695 GB (from 9,676 cyl to 837,760 cyl). Volume capacity
External volume: From 8 GB to 927 GB (from 9,676 cyl to 1,117,760 cyl).
56 Configuring thin provisioning