topic Re: Performance degrading on full backup in Operating System - HP-UX

Performance degrading on full backup

Haimysh — Sun, 26 Aug 2007 23:57:14 GMT

Well, this is my first post so I'm hoping someone can help.

The problem,
HP-UX B.11.11 U 9000/800
Legato Networker 7.1.2.Build.325

What’s happening is every third weekend our full backups "fail". Legato starts consuming vast amounts of CPU time and also seems to be affecting Oracle in that it starts consuming CPU as well.
Backups don't actually stop, just goes VERY slow. This is writing to LTO2, normally get up to 45MB/s, when the problem occurs it drops to about 500KB/S.
No errors show up in syslog.log or nsr.log. Our DBA reports no errors in the Oracle logs.
Things just slow down due to lack of CPU time.

This started to happen after installing Oracle 10g AND the latest Gold patch bundle and kernel changes (required for Oracle 10g)

Rebooting the system fixes the problem for two weeks. The odd thing is it does not seem to affect the incremental backup?

Any help would be appreciated.

Re: Performance degrading on full backup

whiteknight — Mon, 27 Aug 2007 00:42:34 GMT

Hi Haimysh,

Could you please log case to Legato support?

WK

Re: Performance degrading on full backup

tkc — Mon, 27 Aug 2007 00:52:12 GMT

Try download this document for help :

http://h71028.www7.hp.com/ERC/downloads/5982-9971EN.pdf

Re: Performance degrading on full backup

Steven E. Protter — Mon, 27 Aug 2007 08:12:33 GMT

Shalom,

I would tend to think this is a fault in the Legato application. You may need an updated version of it.

SEP

Re: Performance degrading on full backup

Haimysh — Mon, 27 Aug 2007 21:35:44 GMT

Thanks for the input so far..

I ran another test with our DBA present, it failed after an hour. This occurred exactly when Oracle 8i tried to write an archive log to disk (yes we are running 8i & 10g on this system), something we never noticed before.

Sys spec..
Model: 9000/800/rp3440
Main Memory: 6142 MB
Processors: 2
OS mode: 64 bit

This would explain why it does not happen during incremental backups.