Air Cleaner User Manual

Enabling this support does not affect I/O performance, but the filesystem
cannot be remote mounted to another system that does not support this
feature. To change the current value, enter “y” or “n”
Allocation Group (AG) Size
Indicates the current allocation group size. The allocation group is a
grouping of inodes and disk blocks similar to BSD cylinder groups. This
field appears only on AIX 4.2 or later systems.
You can enter a new value in megabytes, which must be 8, 16, 32 or 64.
The valid values will differ depending on the value in the Number of
Bytes Per Inode (NBPI) field. The valid values are shown at the bottom of
the screen.
Advanced Journal Filesystem?
Specify “y” or “n” to make this file system a JFS2 file system.
Note: If you do not already have a JFS2 log in this file system’s volume
group, and you have not specified to enable an Inline JFS Log, then
SysBack will automatically create a JFS2 log for you provided that
you have enough disk space assigned to support it.
Fileystem Block Size
Use this option to specify the JFS2 block size in bytes. A file system block
is the smallest unit of disk storage that can be allocated to a file. Valid
options are 512, 1024, 2048, and 4096. This option only applies to JFS2 file
systems.
Note: This option only applies to backups created on systems running AIX
5.1 or later.
Dense Filesystem?
This option specifies when files are created with holes JFS2 will allocate
disk blocks for those holes and fill them with 0’s. However, this option
was mistakenly documented in the AIX 5.1 and 5.2 product manuals. At
the time of this publication’s creation, this option is not supported by AIX.
This option should always be set to “n” If you mistakenly set this option to
“y”, or you have restoring a backup created with and older level of
SysBack, the latest SysBack code will automatically correct this value and
set it to no.
Use Inline JFS Log?
Specify “y” to this option to place the JFS2 log for this file system in the
logical volume along with file system. Valid options are “y ”and “n”.
Inline Log Size?
If you have set the Use Inline JFS Log to “y”, then use this option to
specify the desired size of that log in megabytes. If you do not enter a size
and leave the value set to “0”, AIX will automatically determine the size
based on its algorithms.
Note: The size may not exceed 10% of the size of the file system.
Chapter 11. Changing the Volume Group, Logical Volume and Filesystem Attributes 11-19