6.5 HP StoreAll OS User Guide

ibrix_fs_tune -f FSNAME {-h HOSTLIST|-g GROUPLIST} -S {SEGNUMLIST|ALL|LOCAL}
Restoring the default segment preference
The default is for all file system segments to be preferred. Use the following command to reset the
file system policy to the default value on HOSTLIST:
ibrix_fs_tune -f FSNAME {-h HOSTLIST|-g GROUPLIST} -p -U
Tuning allocation policy settings
To optimize system performance, you can globally change the following allocation policy settings
for a file system:
• File allocation policy.
IMPORTANT: Certain allocation policies are deprecated. See “File allocation policies”
(page 391) for a list of standard allocation policies.
• Starting segment number for applying changes.
• Preallocation: number of KB to preallocate for files.
• Readahead: number of KB in a file to pre-fetch.
• NFS readahead: number of KB in a file to pre-fetch on NFS systems.
NOTE: Preallocation, Readahead, and NFS readahead are set to the recommended values
during the installation process. Contact HP Support for guidance if you want to change these
values.
On the Management Console, open the Modify Filesystem Properties dialog box and select the
Allocation tab.
396 Using file allocation