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Mounting VMFS3 Volumes in VMware ESXi 5

You have a network with a mix of VMware ESXi 4 and VMware ESXi 5 machines with shared iSCSI storage.  The ESXi 5 machines will not mount the iSCSI datastores, giving only an option to format them.

Solution

  1. Enable SSH to the ESXi 5 machine and connect to it.
  2. Run the  esxcfg-volume -lcommand; you should get output similar to the following:
    # esxcfg-volume -l
    
    An live legacy host (8.46) with mac address 00:22:19:58:e4:73 is detectedVMFS UUID/label: 50b21fca-60af79f8-a0a6-00221958e473/vmfs2
    Can mount: Yes
    Can resignature: No (the volume is being actively used)
    Extent name: naa.6001405259add7ed88c5d4137dadcadc:1 range: 0 - 818943 (MB)
    
    An live legacy host (8.46) with mac address 00:22:19:58:e4:73 is detectedVMFS UUID/label: 4f6906a6-c7048238-6d83-00188b50a70a/vmfs1
    Can mount: Yes
    Can resignature: No (the volume is being actively used)
    Extent name: naa.6001405a50a660dd67cad411ad83ded3:1 range: 0 - 524031 (MB)

    In this case, there are 2 iSCSI shares that the ESXi 5 machine can see but neither will mount.

  3. For each volume you wish to mount, run the esxcfg-volume -M <UUID>. For examples above:
    #esxcfg-volume -M 4f6906a6-c7048238-6d83-00188b50a70a
    Persistently mounting volume 4f6906a6-c7048238-6d83-00188b50a70a
    # esxcfg-volume -M 50b21fca-60af79f8-a0a6-00221958e473
    Persistently mounting volume 50b21fca-60af79f8-a0a6-00221958e473
  4. Return to the vSphere client; you should now see the 2 missing volumes as usable stores

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