HP XP20000XP24000 Disk Array - Manual (Page 28)

Table 10 Pool-VOL Requirements
Item Requirement
Volume type
Logical volume (LDEV)
Note: Separating normal volumes and pool-VOLs into different parity groups is
recommended for best performance.
You cannot specify the following volumes as XP Thin Provisioning Pool-VOLs:
• Volumes used by Business Copy, Auto LUN, Continuous Access, Continuous
Access Asynchronous, or Continuous Access Journal
• LUSE volumes
• Volumes defined by Cache Residency Manager
• Volumes already registered in pools for XP Snapshot or XP Thin Provisioning
• Volumes used as an XP Snapshot P-VOL or S-VOL
• Data Retention Utility volumes with a Protect, Read Only, or S-VOL Disable
attribute
• Volumes created by External Storage
• Volumes whose LDEV attribute is not NORMAL
• External volumes
Emulation type OPEN-V
RAID level
All RAID levels
Pool-VOLs whose RAID levels are different can be registered in the same pool.
However, in view of performance, HP recommends that you specify the same
RAID level for pool-VOLs registered in the same pool.
Drive type
All drive types
Pool-VOLs whose drive types are different can be registered in the same pool.
However, in view of performance, HP recommends that you specify the same
drive type for pool-VOLs registered in the same pool.
Volume capacity
8 GB to 2 TB
Note: Dividing a parity group into 16 volumes is recommended for best
performance.
LDEV format
When you change volumes that are used as normal volumes to pool-VOLs,
perform LDEV formatting before you register the volumes to a pool. Once you
register volumes in a pool, you cannot perform LDEV formatting on the pool-VOLs.
Deleting pool-VOLs
You cannot delete pool-VOLs registered in pools. You need to delete pools
themselves, and then delete the pool-VOLs.
Path definition
Not available.
A volume with a path definition cannot be specified as a pool-VOL.
28 Preparing for XP Thin Provisioning Operations