HP StorageWorks XP24000/XP20000 Thin Provisioning Software User Guide (T5227-96015, May 2011)

Table 9 Operating System and File System Capacity (continued)
Pool Capacity ConsumedMetadata WritingFile SystemOperating
System
Small (one page).Writes metadata to first block.NSKNonStop
Small (one page).
VMware eager-zeroed thick
formatting is not recommended
because it forces the volume to fully
allocate space in the pool.
VMware thin formatting is not
supported due to unpredictable
results.
Writes metadata to first block.VMWVMware (ESX
Server)
Volume and Pool Requirements
Pool-VOL requirements are described in Table 10 (page 26). Pool requirements are described in
“Pool Requirements” (page 27). V-VOL requirements are described in “V-VOL Requirements”
(page 27).
Table 10 Pool-VOL Requirements
RequirementItem
Logical volume (LDEV). Separating pool-VOLs from other volumes into different
parity groups is recommended for best performance.
You cannot specify the following volumes as XP Thin Provisioning pool-VOLs:
• Volumes used by XP Business Copy, XP Auto LUN, XP Continuous Access, XP
Continuous Access Asynchronous, or XP Continuous Access Journal
• LUSE volumes
• Volumes defined by Cache Residency Manager
• Volumes already registered in XP Snapshot or XP Thin Provisioning pools
• Volumes used as XP Snapshot P-VOLs or S-VOLs
• Data Retention Utility volumes with a Protect, Read Only, or S-VOL Disable
attribute
• Volumes whose LDEV attribute is other than normal or Normal (Quick Format)
• System disks
• Command devices
• Quorum disks
You cannot store any pool-VOLs in a pool, including external volumes with a cache
mode attribute.
Volume type
OPEN-VEmulation type
Any RAID level.
• Volumes with different RAID levels in a pool is not recommended.
• RAID-6 is recommended for large pools and where recovery time due to drive
failure may be unacceptable.
RAID level
FC, SATA, and flash drive can be used as drive type.
Internal Volume pool-VOLs: Cannot be intermixed in the same pool if drive types
are different.
External Volume pool-VOLs: Cannot be intermixed in the same pool if drive types
are different; however, this configuration is not recommended for performance
reasons.
Drive type
8 GB to 4 TB.Volume capacity
26 Preparing for XP Thin Provisioning Operations