Speed down

[lasombramtb]

A media server doing backup of it self (over suse). At the beginig the velocity it is about 26 MB per second, but after an hour it reduces until 5 MB, why it can be happend. Any idea,

Netbackup 7.0.1.

thank in advance.

[Marianne]

You need to determine what folder'filesystem is being backed up when you see the slow-down in performance.

Do read-tests outside of NBU to determine read speed from disk/filesystem.

Example: use OS tar command to backup to /dev/null:
# time tar cf /dev/null /folder

Check size of folder:
# du -sk /folder

Calculate KB/sec using above output.

You can also use NBU bpbkar command to test read speed of each filesystem:
Create bpbkar log dir on server. Run:

# /usr/openv/netbackup/bin/bpbkar -nocont -dt 0 -nofileinfo -nokeepalives /filesystem > /dev/null

Check results in bpbkar log.

More info about performance tuning and troubleshooting slow backups:

http://www.symantec.com/docs/TECH147296

Planning and Performance Guide  http://www.symantec.com/docs/TECH62317