Sunday, October 14, 2012

SCSI reservation conflict error in ESX

Basically, if you encounter such an error in your ESX environment,

WARNING: SCSI: 5532: Failing I/O due to too many reservation conflicts

WARNING: SCSI: 5628: status SCSI reservation conflict, rstatus 0xc0de01 for vmhba1:0:7. residual R 919, CR 0, ER 3
WARNING: J3: 1970: Error committing txn to slot 0: SCSI reservation conflict

you should follow VMware kb 1005009

On the storage side, make sure you follow best practise guide.  For example, array fan in limitation.  For Symmetrix, make sure the front end port is dedicated for ESX connection only and do not mix with other host running other OS. 

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