Qlogic scsi command timeout

Hi,
I am doing some testing for Windows 2008 R2 SP1 boot from SAN with Qlogic HBAs.
We noticed that a logical path failure will hang IO on the server for about 30 seconds...
From traces it looks like 20 seconds is some king of timeout waiting to be expired (I suspect some kind of scsi command timeout)
Another 7 seconds is spent with MPIO to disable that logical path...
I tried searching the internet for such a timeout on windows and could not find any.
Any of you know about this? Is there a way to verify this parameter value?
Thanks
Offer Baruch
You may increase default 30 seconds timeout to whatever you want (don't go too high however, 180 sounds like a maximum working one).
Changing the disk timeout on Microsoft Windows Server
Learn how to change the disk timeout value on Windows Server 2000, 2003, and 2008 operating systems.
On your Windows Server hosts, change the disk I/O timeout value to
xxx in the Windows registry, as follows:
In Windows, click Start > Run.
In the dialog text box, type <samp class="ph codeph">regedit</samp> and click Enter.
In the registry browsing tool, locate the HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Disk\TimeOutValue key.
Confirm that the value for the key is xxx (decimal value). If necessary, change the value to
xxx.
You can read more info here:
http://blogs.msdn.com/b/san/archive/2011/09/01/the-windows-disk-timeout-value-understanding-why-this-should-be-set-to-a-small-value.aspx
Hope this helped. Good luck!
StarWind VSAN [Virtual SAN] clusters
Hyper-V without SAS, Fibre Channel, SMB 3.0 or iSCSI, uses
Ethernet to mirror internally mounted SATA disks between hosts, starts with just a pair of boxes and scales-out to infinity.

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Edited by: Bonowow on Feb 24, 2010 11:38 AM
Edited by: Bonowow on Feb 24, 2010 11:42 AM

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