HP XP P9500 Storage - Manual (Page 312)

Create Pools wizard
Create Pools window
Use this window to create new pools for Thin Provisioning, Fast Snap, or Snapshot.
CAUTION: When you create the Thin Provisioning or Thin Provisioning Z pool, if you specify
Any for RAID level to display the Select Pool VOLs window, external volumes with the cache mode
set to disabled are not displayed in the Available Pool Volumes table because they cannot coexist
with volumes of the other RAID levels:
When you select these volumes in the Select Pool VOLs window, specify a hyphen (-) for RAID level.
312 Thin Provisioning and Smart Tiers GUI reference