HP XP P9500 Storage - Manual (Page 76)

Pool-VOL requirements
Pool-VOLs make up a THP-pool.
Requirements Items
Logical volume (LDEV) Volume type
While pool-VOLs can coexist with other volumes in the same parity group, for best performance:
•
pool-VOLs for a pool should not share a parity group with other volumes.
• pool-VOLs should not be located on concatenated parity groups.
Pool-VOLs cannot be used for any other purpose. For instance, you cannot specify the following
volumes as Thin Provisioning and Smart Tiers pool-VOLs:
• Volumes used by Business Copy, Auto LUN, Continuous Access Synchronous, External Storage
Access Manager, or Continuous Access Journal
•
LUSE volumes
• Volumes defined by Cache Residency
•
Volumes already registered in Fast Snap, Snapshot, Thin Provisioning, or Smart Tiers pools
• Volumes used as Fast Snap, Snapshot 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.
•
System disks
•
Command devices
• Quorum disks
OPEN-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 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.
•
RAID 1 pool-VOLs with SATA-E drive types cannot be registered in a pool.
•
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:
◦
If there are pool-VOLs of the same hard disk drive type in a pool, unify the RAID levels.
◦
Although you can set four or more of hard disk drive types for pool-VOLs in the same
pool, you should use three or fewer types.
• 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.
•
If Enabled is displayed for Mixable in the Remote Web Console window, the volumes of
RAID 1, RAID 5, RAID 6 and external volumes can coexist in the same pool. If Disabled is
displayed for Mixable in the Remote Web Console window, the volumes of RAID 1, RAID
5, RAID 6 and external volumes cannot coexist in the same pool.
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.
•
RAID 1 pool-VOLs with SATA-E drive types cannot be registered in a pool.
76 Configuring thin provisioning