Smart array SAR stats

[Nicolas Mailhot]

I've just found out Smart array sisk stats are not collected by SAR like on a normal SCSI disk.

When specifying the device iostat works though.

What should be done in the kernel or sysstat to get those stats collected ? Writing a cron that runs iosstat to collect io stat seems really silly, sar is supposed to do it automatically in a better way. I suppose it's only a matter of registering the raid devices somewhere.

The system is RH 7.3 on a few ML-350s though the problem appears to be generic.

[I_M]

What's version of sysstat are you using?

http://perso.wanadoo.fr/sebastien.godard/

You may download and try latest sysstat. 4.0.3 is almost 1year ++ now.

Good luck

[Nicolas Mailhot]

I tried both RH 7.3 sysstat and the latest one on systat's site.

In both version iostat works with -x and the device only but this switch does not seem to exists for the cron jobs that are supposed to gather system stats.

So I can get current numbers, but I can't get history like with classic disks.

This is very annoying when you have to work on scaling problems, for example.