HP XP7 User Manual page 67

The following table shows the effects of some combinations of operating system and file system
capacity. For more information, contact your HP representative.
OS File System
Windows Server NTFS
2003 and Windows
Server 2008*
Linux XFS
Ext2
Ext3
Solaris UFS
VxFS
AIX JFS
JFS2
VxFS
HP-UX JFS (VxFs)
HFS
Explanatory notes:
O: Indicates an effective reduction of pool capacity.
X: Indicates no effective reduction of pool capacity.
Metadata Writing
Writes metadata to first block.
Writes metadata in Allocation
Group Size intervals.
Writes metadata in 128-MB
increments.
Writes metadata in 52-MB
increments.
Writes metadata to the first
block.
Writes metadata in 8-MB
increments.
Writes metadata to the first
block.
Writes metadata to the first
block.
Writes metadata to the first
block.
Writes metadata in 10-MB
increments.
Pool Capacity Consumed
O
Small (one page)
If file update is repeated, allocated
capacity increases when files are
updated (overwritten). Therefore, the
effectiveness of reducing the pool
capacity consumption decreases.
O
Depends upon allocation group size.
The amount of pool space consumed
will be approximately [THP V-VOL
Size]*[42 MB/Allocation Group Size]
O
About 33% of the size of the THP
V-VOL.
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%.
X
Size of THP V-VOL.
O
Small (one page).
X
Size of THP V-VOL.
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.
O
Small (one page).
O
Small (one page).
O
Small (one page).
X
Size of THP V-VOL.
Thin provisioning requirements 67