HP XP P9500 Storage - Manual (Page 80)

Pool Capacity Consumed Metadata Writing File System OS
Ext3 The default block size for these file
systems is 4 KB. This results in 33% of
the THP V-VOL acquiring THP pool
pages. If the file system block size is
changed to 2 KB or less then the THP
V-VOL Page consumption becomes
100%.
1
Size of THP V-VOL.
2
Writes metadata in 52-MB
increments. UFS Solaris
Small (one page).
1
Writes metadata to the first
block. VxFS
Size of THP V-VOL. Writes metadata in 8-MB
increments. JFS AIX
If you change the Allocation Group
Size settings when you create the file
system, the metadata can be written
to a maximum interval of 64 MB.
Approximately 65% of the pool is
used at the higher group size setting.
2
Small (one page).
1
Writes metadata to the first
block. JFS2
Small (one page).
1
Writes metadata to the first
block. VxFS
Small (one page).
1
Writes metadata to the first
block. JFS (VxFs) HP-UX
Size of THP V-VOL.
2
Writes metadata in 10-MB
increments. HFS
1. There is an effective reduction of pool capacity.
2. There is no effective reduction of pool capacity.
*See “Formatting LDEVs in a Windows environment” (page 143)
Using Thin Provisioning or Smart Tiers with other P9500 products
Interoperability of THP V-VOLs and pool-VOLs
THP V-VOLs and pool-VOLs can be used in conjunction with other P9500 products. The following
table lists the operations that are permitted and not permitted.
Not permitted Permitted Product name (Guide name)
Performing operations on THP
pool-VOLs or THP V-VOLs. Not applicable Cache Residency (HP XP P9000
Performance for Open and Mainframe
Systems User Guide)
Using a THP V-VOL as a Snapshot
P-VOL. The maximum total number of Snapshot (HP XP P9000 Snapshot
User Guide) •
Using a THP V-VOL as a Snapshot
S-VOL or pool-VOL.
pools per storage system is 128.
• Using a Thin Provisioning, Smart
Tiers or Fast Snap pool-VOL as a
Snapshot P-VOL, S-VOL or pool-VOL.
Snapshot pool limits are reduced by
80 Configuring thin provisioning