6.5 HP StoreAll OS CLI Reference Guide

Deprecated segment preferences and allocation policies
IMPORTANT: HP recommends that you do not use these options. They are currently supported
but will be removed in a future release.
CommentDescriptionName
Should be used only on the advice
of HP support.
Lets the StoreAll software select the allocation policy.AUTOMATIC
Should be used only on the advice
of HP support.
Allocates files to the segment where its parent
directory is located.
DIRECTORY
Should be used only on the advice
of HP support.
Allocates files to one segment until the segment’s
storage limit is reached, and then moves to the next
STICKY
segment as determined by the AUTOMATIC file
allocation policy.
Should be used only on the advice
of HP support.
For clusters with more than 16 file serving nodes,
takes a subset of the servers to be used for file
HOST_ROUNDROBIN_NB
creation and rotates this subset on a regular, periodic
basis.
Use NONE only to set file and
directory allocation to the same
policy.
Sets directory allocation policy only. Causes the
directory allocation policy to revert to its default,
which is the policy set for file allocation.
NONE
How file allocation settings are evaluated
By default, ALL segments are preferred and file systems use the RANDOM allocation policy. These
defaults are adequate for most StoreAll environments; but in some cases, it may be necessary to
change the defaults to optimize file storage for your system.
A StoreAll client or StoreAll file serving node (referred to as “the host”) uses the following precedence
rules to evaluate the file allocation settings that are in effect:
• The host uses the default allocation policies and segment preferences: The RANDOM policy
is applied, and a segment is chosen from among ALL the available segments.
• The host uses a non-default allocation policy (such as ROUNDROBIN) and the default segment
preference: Only the file or directory allocation policy is applied, and a segment is chosen
from among ALL available segments.
• The host uses a non-default segment preference and a non-default allocation policy (such as
LOCAL/ROUNDROBIN): A segment is chosen according to the following rules:
◦ From the pool of preferred segments, select a segment according to the allocation policy
set for the host, and store the file in that segment if there is room. If all segments in the
pool are full, proceed to the next rule.
◦ Use the AUTOMATIC allocation policy to choose a segment with enough storage room
from among the available segments, and store the file.
Synopsis
Set an allocation policy:
ibrix_fs_tune -f FSNAME {-h HOSTLIST|-g GROUPLIST} -p POLICY [-S
STARTSEGNUM] [-R]
The policy is applied to the specified file serving nodes and StoreAll clients (HOSTLIST) or host
groups (GROUPLIST) for file system FSNAME, starting at the segment with the most available
storage.
To specify the starting segment for applying the policy, include the -S STARTSEGNUM option.
88 StoreAll commands