An administrator receives a report that a failover event has occured on a storage device. Following the event, multiple Microsoft Windows based virtual machines experienced blue screen errors. Only Microsoft Windows based virtual machines were affected.
What can be done to ensure that these virtual machines remain up and running?
A.
Change the Microsoft Windows guest operating system disk timeout from 30 seconds to 60 seconds.
B.
Change the Microsoft Windows guest operating system disk timeout from 60 seconds to 90 seconds.
C.
Ensure that the Windows VMs are using LSI logic virtual SCSI controllers.
D.
Ensure that the Windows VMs are using Buslogic virtual SCSI controllers.
Correct answer is B.
Explanation:
Path Failover and Virtual Machines
Path failover occurs when the active path to a LUN is changed from one path to another, usually because of a SAN component failure along the current path.
When a path fails, storage I/O might pause for 30 to 60 seconds until your host determines that the link is unavailable and completes failover. If you attempt to display the host, its storage devices, or its adapters, the operation might appear to stall. Virtual machines with their disks installed on the SAN can appear unresponsive. After failover is complete, I/O resumes normally and the virtual machines continue to run.
However, when failovers take a long time to complete, a Windows virtual machine might interrupt the I/O and eventually fail. To avoid the failure, set the disk timeout value for the Windows virtual machine to at least 60 seconds.
see http://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.vsphere.storage.doc_50%2FGUID-EB427F68-6CA1-4A1B-A90E-17D21B913E2E.html
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@Francesco – A is correct. The article you mention states ‘at least 60 seconds’. The vmware kb belows says change to 60 seconds. The default setting is 30 seconds. So, you would go from the default (30) to 60.
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1014
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Thanks Kevin you are completely right I made a mistake reading article.
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The correct answer is B.
As Kevin pointed out it saids “at least 60 secs” 30-60 seconds is for storage. Which means that guest OS would require a longer time out than the storage. I.E 60-90 seconds
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It’s “A”. The default in Windows is 30 sec, so you cannot change it from 60 to 90, since it’s 30.
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