6.5 HP StoreAll OS CLI Reference Guide

ibrix_fs_tune
Overrides the default file allocation behavior on file serving nodes and clients.
Description
File allocation policies are set per file system on each file serving node and on StoreAll clients.
The policies define the following:
• Preferred segments. The segments where a file serving node or StoreAll client creates all new
files and directories.
• Allocation policy. The policy that a file serving node or StoreAll client uses to choose segments
from its pool of preferred segments to create new files and directories.
The segment preferences and allocation policy are set locally for StoreAll clients. For NFS, SMB,
HTTP, and FTP clients (collectively referred to as NAS clients), the allocation policy and segment
preferences must be set on the file serving nodes from which the NAS clients access shares.
Segment preferences and allocation policies can be set and changed at any time, including when
the target file system is mounted and in use.
IMPORTANT: It is possible to set separate allocation policies for files and directories. However,
this feature is deprecated and should not be used unless you are directed to do so by HP support.
NOTE: StoreAll clients access segments directly through the owning file serving node and do not
honor the file allocation policy set on file serving nodes.
IMPORTANT: Changing segment preferences and allocation policy will alter file system storage
behavior.
The following tables list standard and deprecated preference settings and allocation policies.
Standard segment preferences and allocation policies
CommentDescriptionName
This is the default segment preference. It is suitable
for most use cases.
Prefer all of the segments available in the file
system for new files and directories.
ALL
No writes are routed between the file serving nodes
in the cluster. This preference is beneficial for
Prefer the file serving node’s local segments for
new files and directories.
LOCAL
performance in some configurations and for some
workloads, but can cause some segments to be
overutilized.
This is the default allocation policy. It generally
spreads new files and directories evenly (by number
Allocate files to a randomly chosen segment
among preferred segments.
RANDOM
of files, not by capacity) across all of the preferred
segments; however, that is not guaranteed.
This policy guarantees that new files and folders
are spread evenly across the preferred segments
(by number of files, not by capacity).
Allocate files to preferred segments in segment
order, returning to the first segment (or the
designated starting segment) when a file or
directory has been allocated to the last segment.
ROUNDROBIN
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