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ibrix_rebalance

Redistributes files among segments to balance segment utilization and server workload, or evacuates

all files from specific segments.

Description

Rebalancing files

The X9000 Software Rebalancer redistributes files among segments in a file system to balance

segment utilization and server workload. Normally all segments are rebalanced, possibly as a

cron job, but a rebalancing can be limited to specific segments. Only segments containing files

can be rebalanced.

During rebalancing, X9000 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, X9000 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, X9000

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.

Rebalancing runs in two modes: corrective and analytical. Corrective mode, the default, makes

all rebalancing calculations and implements the results. Analytical mode, specified with the -a

option, makes all rebalancing calculations and reports the results without actually migrating the

files.

Evacuating a segment

Before retiring storage, you will need to move, or evacuate, all files from the segments on that

storage to other segments in the same file system. If segments with adequate space are not available,

you will need to use ibrix_fs to extend the file system. The evacuation operation is transparent

to users or applications accessing the file system. The amount of IO activity on the segment affects

the time required for the operation.

Synopsis

Rebalance segments:

ibrix_rebalance -r -f FSNAME [-a] [-e] [[-s SRCSEGMENTLIST] [-S

SRCLVLIST]] [[-d DESTSEGMENTLIST] [-D DESTLVLIST]] [-m INACTIVESECONDS]

[-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

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