Exchange 2003 and High Average Disk Queue Length and Pages/sec val
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From: Pearl on 17 May 2010 14:06 We have 3 mailbox servers. Exch1 and Exch2 hold the bulk of our mailboxes, approx 1500 each. Both servers are Virtual Machines but this problem was experienced even while they were physical servers. The Logs and databases exist on different SAN Luns. On each of these servers, the Average Disk Queue Length and Pages/sec values run continuously high. We are unsure why this is occurring. As I am new to Exchange Troubleshooting, I am seeking advice. We also run Enterprise Vault, BES and our employees use Outlook 2007/SP2. I've run Perfmon on the servers and reviewed different settings to include: Disk send and receive counters (altho I don't think this is of any value since we are using SAN LUNs, correct?); Database page fault stalls; RPC Averaged Latency; Log Record Stalls/sec ;Log Threads Waiting ; Paging File\% Usage. The values of these counters appeared normal. Can anyone assist?
From: Rich Matheisen [MVP] on 17 May 2010 17:01
On Mon, 17 May 2010 11:06:01 -0700, Pearl <Pearl(a)discussions.microsoft.com> wrote: >We have 3 mailbox servers. Exch1 and Exch2 hold the bulk of our mailboxes, >approx 1500 each. Both servers are Virtual Machines but this problem was >experienced even while they were physical servers. The Logs and databases >exist on different SAN Luns. On each of these servers, the Average Disk >Queue Length and Pages/sec values run continuously high. We are unsure why >this is occurring. As I am new to Exchange Troubleshooting, I am seeking >advice. We also run Enterprise Vault, BES and our employees use Outlook >2007/SP2. I've run Perfmon on the servers and reviewed different settings to >include: Disk send and receive counters (altho I don't think this is of any >value since we are using SAN LUNs, correct?); Database page fault stalls; RPC >Averaged Latency; Log Record Stalls/sec ;Log Threads Waiting ; Paging File\% >Usage. The values of these counters appeared normal. Can anyone assist? Start here: http://pal.codeplex.com/ http://blogs.technet.com/mikelag/archive/2008/08/20/performance-troubleshooting-using-the-pal-tool.aspx Get, and install, the necessary tools (including PerfWiz for E2K3) and get a better handle on what's out of line. Excessive paging and long disk queues may be pointing out that you're sharing a LUN between the page file and some Exchange files. Or it may mean your server's misconfigured. But until you look at the overall perfromance picture you may be picking the wrong things to fix. --- Rich Matheisen MCSE+I, Exchange MVP |