6.5 HP StoreAll OS CLI Reference Guide

ibrix_rebalance
Redistributes files among segments to balance segment utilization and server workload.
Description
Rebalancing files
The StoreAll Rebalancer redistributes files among segments in a file system to balance segment
utilization and server workload. Only segments containing files can be rebalanced.
During rebalancing, StoreAll software calculates the average aggregate utilization of all of the
source segments, and then moves files from sources to destinations to bring each source segment
as close as possible to the calculated utilization threshold. The final per-segment usage depends
on the average file size for the target file system.
If you do not specify sources or destinations, candidate segments are sorted into sources and
destinations and then rebalanced as evenly as possible.
If you specify sources, all other candidate segments in the file system are tagged as destinations,
and vice versa if you specify destinations. Following the general rule, StoreAll software calculates
the utilization threshold from the sources and then brings the sources as close as possible to this
value by evenly distributing excess files among all the destinations. If you specified sources, the
end result is that only those segments are rebalanced, and the overflow is distributed among all
remaining candidate segments. If you specified destinations, the end result is that all segments
except the specified destinations are rebalanced, and the overflow is distributed only to the
destinations.
If you specify both sources and destinations, only the specified sources are rebalanced and the
overflow is distributed among only the specified destinations.
If there is not enough aggregate room in destination segments to hold the files to be moved, StoreAll
software issues an error message and does not move any files. The more restricted the number of
destinations, the higher the likelihood of this error.
Synopsis
Rebalance segments:
ibrix_rebalance -r -f FSNAME [[-s SRCSEGMENTLIST] [-S SRCLVLIST]] [[-d
DESTSEGMENTLIST] [-D DESTLVLIST]] [-v]
The command rebalances all segments or selected segments in file system FSNAME. The file system
must be mounted before it can be rebalanced. If you do not enter source and destination segment
lists, all segments are rebalanced. If you enter source and destination segments, specified by either
segment name or logical volume name, rebalancing activity is restricted to those segments.
Display a summary of rebalancing and segment evacuation tasks:
ibrix_rebalance -l [-f FSLIST]
Use FSLIST to limit the command to specific file systems.
List status information about rebalancing tasks:
ibrix_rebalance -i [-f FSLIST]
The report lists jobs by task ID and file system and indicates whether each job is running or stopped.
Jobs that are in the analysis (“Coordinator”) phase are listed separately from those in the
implementation (“Worker”) phase. Use FSLIST to limit the command to specific file systems.
Stop a rebalancing task:
ibrix_rebalance -k -t TASKID [-F]
The job is specified by TASKID. To force the job to stop, include the -F option. To obtain the
TASKID, run ibrix_rebalance -i.
ibrix_rebalance 169