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

Table 9 Operating System and File System Capacity
Pool Capacity ConsumedMetadata WritingFile SystemOperating
System
Size of V-VOL.
If you change the Allocation Group
Size settings when you create the
file system, the metadata can be
written to a maximum of 64 MB.
Approximately 65% of the pool is
used.
Writes metadata in 8 MB intervals.JFSAIX
Small (one page).Writes metadata to first block.JFS2
Small (one page).Writes metadata to first block.VxFS
Small (one page).Writes metadata to first block.JFS (VxFs)HP-UX
Size of V-VOL.Writes metadata in 10 MB
intervals.
HFS
Depends on allocation group size.
The amount of pool space
consumed is approximately [V-VOL
Size]*[42 MB/Allocation Group
Size].
Writes metadata in Allocation
Group Size intervals.
XFSLinux
About 33 % of the size of the
V-VOL.
The default block size for these file
systems is 4 KB. This results in 33%
of the V-VOL acquiring pool pages.
If the file system block size is
changed to 2 KB or less, the V-VOL
Page consumption becomes 100%.
Writes metadata in 128 MB
intervals.
Ext2
Ext3
Size of V-VOL.Writes metadata in 52 MB
intervals.
UFSSolaris
Small (one page).Writes metadata to first block.VxFS
Small (one page).
The allocated capacity increases if
the update of the file is repeated,
and the effectiveness of reducing
the pool capacity consumption
decreases.
Writes metadata to first block.NTFSWindows
Server 2003
Small (one page).
If you perform the standard format
operation when creating the file
system, the size of the pool
capacity as same as the file system
capacity is consumed. In this case,
we recommend the quick format.
The allocated capacity increases if
the update of the file is repeated,
and the effectiveness of reducing
the pool capacity consumption
decreases.
Writes metadata to first block.NTFSWindows
Server 2008
Small (one page).Writes metadata to first block.VFSTru64
Small (one page).Writes metadata to first block.AdvFS
Small (one page).Writes metadata to first block.VMSOpenVMS
Preparing the Storage System and Remote Web Console Computers 25