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Disk_Queue_Length is CRITICAL or high Expand / Collapse
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Posted Thursday, April 25, 2013 11:58 AM
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This is regarding the Cluster servers 723/722/721 3 Nodes (Active/Active/Passive). At around Fri Mar 29 11:05:42 EDT 2013, We have got alert from monitoring agent Nagios that “Disk_Queue_Length is CRITICAL” and during that time SQL stopped responding for a couple minutes and this happened about 3 times.
Since that time I disabled the Nagios alert on that particular event.

Storage Team/Backup Team/Wintel Team - saying that no issues found from their end.

Windows Administration team says its everything normal on their side.

SQL Team - Saying that when this issue happened that time there was no jobs were running on this cluster and no issues.

Can any one suggest here where exactly issue is and how to resolve this issue.
Thanks a million in advance.
Post #1446661
Posted Thursday, April 25, 2013 1:26 PM


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you run anti-virus on those nodes? I always check anti-virus logs when all else appears normal.
Post #1446688
Posted Wednesday, May 1, 2013 2:16 AM
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hi Geoff A
Thanks for your reply,

I gone through the antivirus log file, but could not find any thing related to the mdf or ldf files.
will there be any other issues ?, because we disabled the monitoring alert on the cluster nodes regarding this issue,

I think, I should go for Microsoft support.

Thanks alot.
Post #1448334
Posted Wednesday, May 1, 2013 2:37 AM


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Before you call CSS, I would check the underlying SAN LUNs and be sure there isn't contention there. The SAN admins often look at averages, but if they've carved up physical disks and shared them among LUNs, there can be some contention from other systems.

No A/V is good, have you also checked if some type of backup or snapshotting was occurring at this time? Anything that might have frozen disk access briefly for SQL Server?







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Post #1448340
Posted Thursday, May 2, 2013 6:40 AM


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There are quite a number of things that could be at fault here, especially given the clustering setup you have. I would review every error log you can get your hands on before going to external support. I believe you can get better and MUCH less expensive help than Microsoft CSS too, but I am a tad biased on that statement.

Best,

Kevin G. Boles
SQL Server Consultant
SQL MVP 2007-2012
TheSQLGuru at GMail
Post #1448788
Posted Thursday, May 2, 2013 9:48 AM


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Can you check your error log for IO take longer duration warning message?
Post #1448873
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