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  3. May 2003

Re: Journal performance problems

You should have the Disk controller with the 104MB of write cache (or better if you have PCI-X towers/technology), if you have the older controllers it will slow writing the Journal Rcvrs. I would also recommend adding another mirrored disk set to spread your I/O.

Pete Massiello

oliver.wenzel@xxxxxxxxxxxxxxxxxxxxxxx wrote:

Hello,

well, we are currently setting up our HA solution (DataMirror). Therefore, we had to start journalling on all production files.

The journals are located in ASP2, which has 1 (mirrored) disk drive with about 17.5GB capacity (type 6718).

We now find we have severe performance problems some times. There's an invoicing job that normally runs about 1:30 hours and now takes 2:30 w/o much change in database activity. The only other active batch job at that time is also database intensive and runs longer than normally.

My guess is these jobs are waiting for journal entries to be written. The ASP2 disk drive is very busy at that time.

Any ideas on how to confirm this?

Also, we could add a disk drive to ASP2, which should help some. Or might it be better to cancel ASP2 and add the disks to ASP1?

I've started Management Central performance monitoring to get a better look at system activity.

Any suggestions?

Regards,

Oliver
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