5 Replies Latest reply on Feb 6, 2018 1:50 PM by VirtualRay

    luns not accessible

    VirtualRay Hot Shot


      We had a problem with our P2K recently but after we bring back the storage array some of the hosts are not able to access the LUNS.




      018-02-05T17:18:07.272Z cpu18:36053 opID=42052f24)World: 14369: VC opID 92D4B216-0000587C-db-cc maps to vmkernel opID 42052f24

      2018-02-05T17:18:07.272Z cpu18:36053 opID=42052f24)Partition: 423: Failed read for "naa.600c0ff000195c8a26ea705301000000": I/O error

      2018-02-05T17:18:07.272Z cpu18:36053 opID=42052f24)Partition: 1003: Failed to read protective mbr on "naa.6xxxxxxx" : I/O error

      2018-02-05T17:18:07.272Z cpu18:36053 opID=42052f24)WARNING: Partition: 1112: Partition table read from device naa.XXXXXXX failed: I/O error

      2018-02-05T17:18:17.283Z cpu12:32817)ScsiDeviceIO: 2369: Cmd(0x413642d33b40) 0x1a, CmdSN 0x3215 from world 0 to dev "naa.600c0ff000195c8ae7e9705303000000" failed H:0x5 D:0x0 P:0x0 Possible sense data: 0x0 0x0 0x0.


      Any suggestions..

        • 1. Re: luns not accessible
          daphnissov Guru
          vExpertCommunity Warriors

          Check with the storage vendor. I/O errors like those can often mean data corruption has occurred.

          • 2. Re: luns not accessible
            continuum Guru
            Community WarriorsvExpert

            So you can still read the content from some hosts ?
            Then do the following:
            - unmount the volume on those hosts that can no longer read it. - DO THIS ASAP
            - select one host that still can read the volume and unmount the volume on all other hosts
            - use this one host to copy all VMs to another datastore
            - rebuild the affected datastore from scratch and avoid RAID 5
            Assume that the situation may deteriorate if you do not act soon - so do not waste too much time in the current state.

            • 3. Re: luns not accessible
              dekoshal Hot Shot

              Try performing LUN reset (KB below) followed by below command in sequence.


              VMware Knowledge Base


              1. esxcfg-rescan -A

              2. vmkfstools -V

              3. Check the availability of the datastore in question.


              For further troubleshooting check storage array logs if required.


              If you found this or any other answer helpful, please consider the use of the Correct or Helpful to award points.


              Best Regards,

              Deepak Koshal



              • 4. Re: luns not accessible
                continuum Guru
                Community WarriorsvExpert

                > Check with the storage vendor. I/O errors like those can often mean data corruption has occurred.
                From several years of VMFS-recovery I have learned that if one host in a cluster complains about I/O errors this does not necessarily means that the actual data is corrupted.
                Often another host or a linux system can still read the data without problems.
                So whenever I come across this issue I first try to read the data using another host or a Linux LiveCD.
                So the surprising lesson here is that I/O errors in a vmkernel log basically do not immediatly mean corruption but rather that "this" host does not want to cooperate.
                Yes - I know how crazy that sounds
                Also when one host complains that a LUN has no partitiontable it does not mean that there is no partitiontable.

                • 5. Re: luns not accessible
                  VirtualRay Hot Shot

                  i shutdown all vms and esxi's and restarted both storage array controllers  and then power them up.


                  thank you everyone.