[THIN] Re: Disk Queue Length Question
- From: "Raffensberger, Stephen D" <sraffens@xxxxxxxxxxxxxxxxx>
- To: <thin@xxxxxxxxxxxxx>
- Date: Mon, 8 Jun 2009 12:00:22 -0400
VM's often give false readings as well. Your EMC should have performance
monitors that can either verify or refute your findings.
Your note is confusing. Avg Disk Read & Write? Do you mean Avg Disk
sec/Read & Write?
Steve Raffensberger
CSG Citrix Administrator
Sovereign Bank
________________________________
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On
Behalf Of Webster
Sent: Monday, June 08, 2009 11:35 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Disk Queue Length Question
Greetings,
Have a customer having an issue with frozen sessions on a TS2003/XA5
x86server. The issue happens with both RDP and ICA. And happens
remotely or logged in to the console.
Issue: When using Adobe Acrobat 9.1 Pro to create PDFs from various form
of documents, the sessions freeze for very long periods of time. i.e. >
20 minutes
Info: TS/XA server is a VM under Hyper-V. My Docs and Roaming Profiles
are redirected to File Servers that are also VMs under Hyper-V.
My Docs and Roaming Profiles are stored on an EMC SAN connected via 4GB
FC. Both are configured for RAID5 as that is the only option available
to them until they do a major upgrade on the SAN sometime this summer.
Problem: Avg Disk Queue Length is > 1,300
Avg Disk Read > 4,500
Avg Disk Write > 22,000
Question: Of course I know that taking, on avg, 22 SECONDS to write a
block of data is going to cause MAJOR issues and is more than likely the
cause for the session hangs/freezes. But, on a FC SAN, are Avg Disk
Queue Length and or Current Disk Queue Length valid counters to monitor
for a Terminal Server/XenApp Server?
I am finding conflicting advice on whether the Disk Queue Length
counters are valid for either SANs or Roaming Profiles and redirected My
Docs stored on a SAN.
Thanks
Webster
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