HP XP P9500 Storage - Manual (Page 71)

Pool-VOL requirements
Pool-VOLs make up a THP-pool.
Requirements Items
Logical volume (LDEV) Volume type
For best performance, pool-VOLs for a pool should not share a parity group with other volumes.
Pool-VOLs cannot be used for any other purpose. For instance, you cannot specify the following
volumes as Thin Provisioning 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 Snapshot, Thin Provisioning, or Smart Tiers pools
•
Volumes used as 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 a 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 must also have the same RAID level.
•
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 Mixable displayed on the Remote Web Console window is Enable on, the Remote Web
Console window must be enabled for theinternal volume and external volume tocan coexist.
If Mixable displayed on the Remote Web Console window is Disable, the internal volume
and external volume cannot coexist.
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 a 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.
•
Only one RAID level can be used for the pool-VOLs of a drive type (tier).
• Pool-VOLs of an external volume must have cache mode enabled.
•
If Mixable displayed on the Remote Web Console window is Enable, the internal volume
and external volume can coexist. If Mixable displayed on the Remote Web Console window
is Disable, the external volume cannot be used.
SAS 15K, SAS 10K, SAS 7.2K, SATA-W/V, SATA-E, SSD, and external volumes. Drive type for a Thin
Provisioning pool
If Mixable on the Remote Web Console window is Enable, up to three different drive types of
pool-VOLs can be registered in the same pool. If Mixable is Disable, only one drive type of
pool-VOLs can be registered in a 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.
Thin provisioning requirements 71