HP XP P9500 Storage - Manual (Page 77)

Requirements Items
• 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 in a tier, 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.
◦
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.
•
If Enabled is displayed for Mixable in the Remote Web Console window, the internal volume
and external volume can coexist. If Disabled is displayed for Mixable in the Remote Web
Console window, the external volume and the RAID 1 pool-VOLs cannot be used.
If Mixable in the Remote Web Console is Enable up to three different drive types of pool-VOLs
can be registered in the same pool. If Mixable is Disable in the Remote Web Console, only one
drive type of pool-VOLs can be registered in the same pool. Hard disk drive for a
Thin Provisioning
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 required
I/O performance is not degraded by using less desirable drive types.
•
Unless intentionally transitioning between SATA drive types, a SATA-E volume and a
SATA-W/V volume should not coexist in a pool.
• RAID 1 pool-VOLs with SATA-E drive types cannot be registered in a pool.
SAS15K, SAS10K, SAS7.2K, SSD, SATA-E, SATA-W/V, and the external volume can be used
as the hard disk drive type. These hard disk drive types can coexist in the same pool. Hard disk drive type
for a Smart Tiers
pool
HP does not manufacture or sell SATA drives.
Cautions:
•
It is recommended that the SATA-E volume and SATA-W/V volume do not coexist in one
pool.
• RAID 1 pool-VOLs with SATA-E drive types cannot be registered in a pool.
Internal volume: From 8 GB to 2.9 TB Volume capacity
External volume: From 8 GB to 4 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 (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 system. Any number of available THP-VOLs can be associated with a pool. Maximum number of
THP V-VOLs
Up to 63,232 volume groups per system. If external volumes and V-VOLs are used, the total
number of external volumes and V-VOLs must be 63,232 or less.
Thin provisioning requirements 77