Virtual Disk Not on Preferred Path Due to Failover

I encounter an issues with Dell MD3820i (ISCSI) 10Gb SAN Storage, and it will always prompt Virtual Disk Not on Preferred Path Due to Failover and flash a red light in the SAN Storage

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I did check my MPIO configuration in Windows 2008 R2 & 2012 R2, and noticed that 1 of the path will suddenly show Unavailable due to some unknown reason

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We had log a case to DELL technical support for this issue, and they advise to put the Controller #1 to Offline Mode, and manually remove and insert back during non-peak hours

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Manually put the Controller #1 in Offline Mode

Once we had manually remove and insert back, wait for few minutes and everything look working fine now

Verification on the Preferred Owner & Current Owner, it show both on the same controller now – Previously was Preferred Owner is Controller #1 , but Current owner is Controller #0

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“Mpclaim –s –d” show all the path are Active

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“dsmutil –g 0” show all the path are Active

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We will continue to monitor this issues, and hopefully it will not happen again.

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