Re: [Veritas-bu] Netbackup 6.5 DSSU fragmentation

It's not just a fragmentation issue - a defrag'ed file system may also give you poor destage performance.

A bunch of people have reported this issue but so far nobody has found the smoking gun. It's an issue on multiple platforms as well.

.../Ed

On Wed, May 6, 2009 at 4:10 AM, owiking <netbackup-forum AT backupcentral DOT com> wrote:

Im having problems with my diskstage getting to fragmented and thus getting very slow performance when duplicating to tape. Running defrag isnt an option since the files are reaplced fequently and the defrag job will take to long time to run.
>From what Ive seen and read, this is a major problem for alot os users of Netbackup.

Is there a way to force Netbackup to preallocate space on the diskstage for each backupjob, instead as it is now that they are all written in fragments all over the disk?

Ive read some about the differences with Basic and Advanced diskstages in Netbackup, Im running Basic atm, but havent found any information that Advanced could preallocate space?

My diskstage is 5.5tb large, is it better to make to divide it to 2-3 partitions to avoid fragmentation?

.../Ed

Ed Wilts, RHCE, BCFP, BCSD, SCSP, SCSE
ewilts AT ewilts DOT org

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