topic Re: Write Latency with P212 in Operating System - VMware

Write Latency with P212

Brandon Lemoine — Tue, 22 Feb 2011 03:50:59 GMT

We have a new server with a P212 controller 256 cache. This server maintains a write latency of around 28ms, real is around 3ms, even if the servers VM is not doing anything. This server is currently running one VM. We had issues with the server running at all, so we upgraded the firmware on the controller, 2.5 or whatever is the latest version. This helped with just getting it to work but again seems like this is our of the norm, very slow.

Setup:
ESX 4.1.0,260247
HP DL180 G6, (1) 2.66GHz L5520 with 8GB RAM.
Smart Array P212 (Part # 462834-B21) with 2-15K drivers, RAID 1

We have another server with a P410 running 4 VM's with no issues.

Thank you,

Re: Write Latency with P212

Brandon Lemoine — Tue, 22 Feb 2011 04:34:47 GMT

I even paused the VM and the Write Latency is at 27 and the Read is at 3 constantly. I verified this with ESXTOP (D) G & DAVG/cmd is around 30. With (V) nothing as the VM is not running.

Re: Write Latency with P212

Jags_21 — Wed, 23 Feb 2011 07:43:07 GMT

try updating the ESX 4.1 to build no.: 348481 (update 1) also upgrade the firmware of BIOS on the server and monitor

Re: Write Latency with P212

Brandon Lemoine — Wed, 23 Feb 2011 13:49:54 GMT

Yea, did that no luck. Called HP, they are sending a new controller. I hope that helps. I will keep updating.

Re: Write Latency with P212

Brandon Lemoine — Wed, 23 Feb 2011 22:34:49 GMT

This was an off site server. After going on-site it seems the controller cache might have been disabled. We change the controller and cache along with verifying the setup.