A VMFS volume is not available
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A VMFS volume is not available

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Article ID: 373701

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Updated On:

Products

VMware vSphere ESXi

Issue/Introduction

  • A VMFS volume is not available
  • Can't have the partition outside the disk 
  • Error: The primary GPT table states that the backup GPT is located beyond the end of disk.
  • The LVM or the VMFS header will be either blank or invalid

Environment

VMware vSphere ESXi 7.x
VMware vSphere ESXi 8.x

Cause

 

  • This may happen if the disk has shrunk or partition table is corrupted
  • The available space to /dev/disks/naa.xxxxxxxxxxxxxx appears to have shrunk

    partedUtil getptbl /vmfs/devices/disks/naa.xxxxxxxxxxxxxx

    Error: Function not implemented during read on /dev/disks/naa.xxxxxxxxxxxxxx
    Error: The primary GPT table states that the backup GPT is located beyond the end of disk. This may happen if the disk has shrunk or partition table is corrupted. Fix, by writing backup table at the end? This will also fix the last usable sector appropriately as per the new reduced size. diskPath (/dev/disks/naa.xxxxxxxxxxxxxx) diskSize (468792000) AlternateLBA (468862127) LastUsableLBA (468862094)

    Warning: The available space to /dev/disks/naa.xxxxxxxxxxxxxx appears to have shrunk. This may happen if the disk size has reduced. The space has been reduced by (70128 blocks). You can fix the GPT to correct the available space or continue with the current settings ? This will also move the backup table at the end if it is not at the end already. diskSize (468792000) AlternateLBA (468862127) LastUsableLBA (468862094) NewLastUsableLBA (468791966)

    Error: Can't have a partition outside the disk!
    Unable to read partition table for device

  • Error: Function not implemented during read on /dev/disks/naa.xxxxxxxxxxxxxx

    partedUtil fixGpt /vmfs/devices/disks/naa.xxxxxxxxxxxxxx
    FixGpt tries to fix any problems detected in GPT table.
    Please ensure that you don't run this on any RDM (Raw Device Mapping) disk.
    Are you sure you want to continue (Y/N): Y
    Error: Function not implemented during read on /dev/disks/naa.xxxxxxxxxxxxxx
    Retry/Ignore/Cancel?

  • ON-DISK ERROR: The backup GPT table is corrupt

    voma -m ptbl -f check -d /vmfs/devices/disks/naa.xxxxxxxxxxxxxx
        Scsi 2 reservation successful
    Running Partition table checker version 0.1 in check mode
    Warning !! Using default disk block size of 512. Pass -b <diskblocksize> for 4Kn devices
    Phase 1: Checking device for protective MBR
    Phase 2: Checking device for a valid primary GPT
    Detected valid GPT signatures
        Number    Start          End                Type
        1         64             204863             Efi System
        5         208896         8595455            Linux Native
        6         8597504        16984063           Linux Native
        8         268437504      468862094          vmfs
    Phase 3: Checking device for a valid backup GPT
    ON-DISK ERROR: The backup GPT table is corrupt, but the primary appears OK
    Found a valid partition table on the device
    Total Errors Found:           1
  • Function not implemented during read on /vmfs/devices/disks/naa.###########
  • In this state the LVM or the VMFS header will be either blank or invalid entries.

Resolution

  • Discard the present datastore
  • Present a new lun and recreate a new datastore
  • Restore the vm's from backup
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