topic Re: Va7100 - bottleneck in Disk Enclosures

Va7100 - bottleneck

Sylvie Vezina — Sat, 08 Feb 2003 07:16:00 GMT

Hello,

I run with L2000 11.0, 3 CPU's 4.5 of memory and we think the array va7100 is our bottleneck.
Could you give me a clue to increase the performance of disks
I don't have glance on this machine...

Re: Va7100 - bottleneck

Marc Heinrich — Sat, 08 Feb 2003 12:05:53 GMT

just some thoughts when the Disk is really the issue:
* are you on the current Firmware (not shure but should be something like HP18)
* does the box run in Raid 1/0 or Autoraid ?
I prefer 1/0.
* use more Disks -> stripe over more Disks or have more 1/0 Space in Autoraid Mode.
* is application "well behaving" ?

Re: Va7100 - bottleneck

Vincent Fleming — Sat, 08 Feb 2003 14:00:31 GMT

You have "sar", which can be used to check your system's performance. Use "sar -d" to see disk performance.

In general, in your "sar" output, your "wio" should remain < 10% if your disk performance is good. If it's > 10%, you would benefit from some tuning.

With the VA, be sure that your primary path (in LVM) is Controller-1 on the VA. This will give the best performance.

That's about it for the general stuff... tell us more about your environment, and we can probably make more suggestions.

Good luck,

Vince

Re: Va7100 - bottleneck

Roger_22 — Sun, 09 Feb 2003 05:34:07 GMT

First,

If your not on HP18, then get HP to upgrade your array.

With HP18, set Prefetch Enabled, and Normal Resiliency - these are KEY settings!

After you've tried the above, and you still have poor performance then (in this order);

- Add more disks until you're in RAID 1+0.

- If it's a single controller configuration, consider adding the second controller (this enables write cache)

- If these don't help and this array is full, consider adding more arrays. If you can't afford that, conside removing cpus from the L2000.

Re: Va7100 - bottleneck

Eugeny Brychkov — Fri, 14 Feb 2003 19:34:58 GMT

Sylvie,
please attach 'armdsp -a' command output for this VA to your next reply
Eugeny