Operating system and file system capacity
Operating systems and file systems, when initializing a DP-VOL, consume some Dynamic Provisioning pool space. Some combinations initially take up little pool space, while other combinations take as much pool space as the virtual capacity of the DP-VOL.
The following table shows some combinations of the operating system and file system capacity. For more information, contact your representative.
|
OS |
File System |
Metadata Writing |
Pool Capacity Consumed |
|---|---|---|---|
|
Windows Server 2003 and Windows Server 2008* |
NTFS |
Writes metadata to first block. |
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. |
|
Linux |
XFS |
Writes metadata in Allocation Group Size intervals. |
O Depends upon allocation group size. The amount of pool space consumed is approximately [DP-VOL Size]*[42 MB/Allocation Group Size] |
|
Ext2 Ext3 |
Writes metadata in 128-MB increments. |
O About 33% of the size of the DP-VOL. The default block size for these file systems is 4 KB. This results in 33% of the DP-VOL acquiring HDP pool pages. If the file system block size is changed to 2 KB or less then the DP-VOL Page consumption becomes 100%. |
|
|
Solaris |
UFS |
Writes metadata in 52-MB increments. |
X Size of DP-VOL. |
|
VxFS |
Writes metadata to the first block. |
O Small (one page). |
|
|
AIX |
JFS |
Writes metadata in 8-MB increments. |
X Size of DP-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. |
|
JFS2 |
Writes metadata to the first block. |
O Small (one page). |
|
|
VxFS |
Writes metadata to the first block. |
O Small (one page). |
|
|
HP-UX |
JFS (VxFs) |
Writes metadata to the first block. |
O Small (one page). |
|
HFS |
Writes metadata in 10-MB increments. |
X Size of DP-VOL. |
|
|
Explanatory notes: O: Indicates an effective reduction of pool capacity. X: Indicates no effective reduction of pool capacity. |
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