topic Re: VA 7100 running at 100% Disk Utilization............HELP! in Disk Enclosures

VA 7100 running at 100% Disk Utilization............HELP!

Khalid Dogar — Wed, 11 Dec 2002 17:34:59 GMT

We are running Oracle 8i on 7410 system attached to a VA7100. The Disk utilization is 100% solid since we put the box up in production enviroment. We are afraid to loose the array if it continues..

The VA is set to Autoraid..( Don't know if this has to do with it not)

Anybody any ideas ..why it is doing that..

Thanks
Khalid

Re: VA 7100 running at 100% Disk Utilization............HELP!

Eugeny Brychkov — Wed, 11 Dec 2002 19:26:49 GMT

Khalid,
where did you find disk utilization value? Please clarify. If possible attach file stating this and 'armdsp -a' output
Eugeny

Re: VA 7100 running at 100% Disk Utilization............HELP!

Khalid Dogar — Wed, 11 Dec 2002 20:06:59 GMT

Glance shows the 100% utilization. We can also see the Array physically going crazy. It is a new system, just move to production. I don't know it Oracle has to do with it.

Thanks

Re: VA 7100 running at 100% Disk Utilization............HELP!

Eugeny Brychkov — Wed, 11 Dec 2002 20:20:07 GMT

If you really SEE disk array going crazy (not a sar bug :o) ) then please attach:
- "armdsp -a" output
- "ioscan -fn" output
- describe how VA is connected to host (direct, switch, hub);
- HBA you use and FC HBA software version
Eugeny

Re: VA 7100 running at 100% Disk Utilization............HELP!

Eugeny Brychkov — Wed, 11 Dec 2002 21:18:46 GMT

Here's something about sar
http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xf73106350fe2d61190050090279cd0f9,00.html
Eugeny

Re: VA 7100 running at 100% Disk Utilization............HELP!

Vincent Fleming — Thu, 12 Dec 2002 13:46:53 GMT

From the looks of your glance output, the disk array should be very busy - one of the data points was 967 IOPS... that's >60 IOPS per drive (if you have 15 drives).

There's nothing wrong with loading the array that much - the most that would happen is you experience a slightly higher than normal drive failure rate (because of the higher wear rate). I would not worry about it.

Higher service times would also be typical with heavy loading of the array.

If you want lighter loading on your array, then it appears that the array is undersized. You do not mention the configuration of your VA7100, but more drives are better for performance. If you have 15 73GB drives, consider a VA7410 with about 30 36GB/15K drives for better performance with about the same capacity.

If you have empty slots in your VA7100, try adding some 36GB/15K drives in those slots. It should lighten the load on the remaining drives.

Good luck!

Re: VA 7100 running at 100% Disk Utilization............HELP!

Pal Szabo_1 — Thu, 12 Dec 2002 14:53:50 GMT

Hi!

Please include:
armdsp -a

Maybe you require a fw upgrade ...

Regards:
Paul

Re: VA 7100 running at 100% Disk Utilization............HELP!

KD Kim — Tue, 31 Dec 2002 05:34:40 GMT

My thought is that you will see 100% disk utilization depending on how your DB is configured. You would rather see 100% utilization on a 2GB fiber channel then a Ultra2 or 3.... as long as you have users on the system, or running jobs, reports, etc. then you will see 100%.

What does perf view look like in a trend over a day and week.

Glance only shows you a snap shot of time...