RequirementsItems
• Volumes already registered in Fast Snap, Thin Provisioning, or Smart Tiers pools
• Volumes used as Fast Snap P-VOLs or S-VOLs
• Data Retention volumes with a Protect, Read Only, or S-VOL Disable attribute
• 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
• Quorum disks used by High Availability
OPEN-VEmulation 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 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 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.
• Because the speed of RAID 6 is slower than other RAID levels, tiers that use other RAID levels
should not be placed under a tier that uses RAID 6.
• Pool-VOLs of an external volume must have cache mode enabled.
SSD*, SAS15K, SAS10K, SAS7.2K, and 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
Thin Provisioning
pool
Cautions:
• HP recommends that drives with different types do not coexist in the same pool. 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.
• If multiple data drives coexist in the same pool, HP recommends not using data drives that
are same types and different capacity sizes.
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 pool
64 Configuring thin provisioning
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