HP XP P9500 Storage - Manual (Page 72)

Requirements Items
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.
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. For pool-VOLs in a pool: RAID level for a
Smart Tiers pool
•
RAID 6 is recommended to be applied as the RAID level of pool-VOLs, especially the pool-VOL
where the recovery time from the drive failure is not allowed.
• If hard disk drive types are same, RAID levels in a pool must be same.
•
If pool-VOLs are external volumes, set the cache mode to enable.
• If Enable is displayed for Mixable in the Remote Web Console window, the volume of RAID
1 and external volume can be registered in a pool. However, if Disable is displayed for
Mixable in the Remote Web Console window, a volume of RAID 1 or an external volume
cannot be registered in a pool.
SAS15K, SAS10K, SAS7.2K, SSD, SATA-E, SATA-W/V, and the external volume can be used
as hard disk drive types. Hard disk drive type
for a Smart Tiers
pool
Pool-VOLs registered in a pool can have up to three different hard disk drive types.
Caution: HP recommends that the SATA-E volume and SATA-W/V volume do not coexist in one
pool.
From 8 GB to 4 TB Volume capacity
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 system. Any number of available THP-VOLs can be associated with apool. Maximum number of
THP V-VOLs
Up to 63,232 volume groups per system.
Volume capacity from 46.87 MB to 59.9 TB per volume. Volume capacity
• TB: 0.01 to 59.99
•
GB: 0.04 to 61,439.99
• MB: 46.87 to 62,914,556.25
•
Blocks: 96,000 to 128,849,011,200
However, if you use the volume as a P-VOL or S-VOL of Business Copy, Continuous Access
Synchronous, Continuous Access Journal, or External Storage Access Manager, the volume
capacity must be 4 TB or less.
Total maximum volume capacity of 5.0 PB per storage system.
Available. Path definition
Available (Quick Format is not available.) LDEV format
When you format an LDEV on the THP V-VOLs, the storage system initializes data only in the
consumed pool pages of the THP V-VOLs. However, after you format an LDEV, the free space
in the pool does not increase because the pages are not released.
72 Configuring thin provisioning