HP XP P9500 Storage - Manual (Page 65)

Requirements Items
• For internal and external pool-VOLs to coexist, the cache mode of the external volume must
be set to enable.
•
Mixable on the Remote Web Console window must be enabled for the internal volume and
external volume to coexist.
• The pool-VOL of RAID 1 cannot coexist with pool-VOLs of RAID 5, RAID 6, or an external
volume.
Pool-VOLs of RAID 5, RAID 6, or an external volume can coexist in a pool. Pool-VOLs of RAID
1 cannot be registered. Pool-VOLs of RAID 5, RAID 6, or 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 on the Remote Web Console window is enabled, internal volumes and external
volumes can coexist. If Mixable is disabled, external volumes cannot be used.
SAS 15K, SAS 10K, SAS 7.2K, SATA-W/V, SATA-E, SSD, and external volumes can be used
as drive types. 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.
Therefore, if different drive types are registered in the same pool, ensure that the I/O
performance is the same for each drive.
•
Unless intentionally transitioning between SATA drive types, a SATA-E volume and a
SATA-W/V volume should not coexist in a pool.
SAS 15K, SAS 10K, SATA-E, SATA-W/V, SSD, and an external volume can be used as drive
types. Drive type for a
Smart Tiers pool
Pool-VOLs registered in a pool can have up to three drive types.
Caution: Unless intentionally transitioning between SATA drive types, a SATA-E volume and a
SATA-W/V volume should not coexist in a pool.
Internal volume: From 8 GB to 2.99 TB Volume capacity
External volume with Mixable enabaled: From 8 GB to 2.99 TB
External volume with Mixable disabled: From 8 GB to 3.99 TB
You must format the LDEV before the volume is registered in a pool. You cannot format an LDEV
once it is a pool-VOL. LDEV format
You cannot specify a volume with a path definition as a pool-VOL. Path definition
THP V-VOL requirements
Requirements Items
THP V-VOL. Volume type
The LDEV number is handled in the same way as for normal volumes.
OPEN-V Emulation type
Up to 63,232 per pool. Maximum number of
THP V-VOLs
Up to 63,232 volume groups per system.
Thin provisioning requirements 65