Resetting LUNs

At times we get into a situation where LUN are locked after storage nodes was restarted

The issue was related with locking mechanizm ATS +SCSI and later this mechanizm was change to ATS only to avoid this situation in the future.

 

How to investigate and fix the issue with Luns if they are locked.

Step1.  Investigate the locked  lun’s

  • Login to esx
  • run command esxcfg-info | grep -B5 “s Reserved | Pending”
  • or check the logs  cat /var/log/vmkwarning |more

 

if you see any logs like naa.xxxxx is blocked or state is doubt this is the case.

 

 

Step2.  Reset locked LUN

vmkfstools –lock lunreset /vmfs/devices/disks/naa.xxxxxxx

 

 

Step3.    Checking if any locked luns still exist

esxcfg-info | grep -B5 “s Reserved | Pending” or check the logs  /var/log/vmkwarning

 

 

 

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