ESXi 5.1: can’t create multiextent node Error

I just upgrading my VMware ESXi 5.0 to VMware ESXi 5.1 using installation disc and I found one of my VM inside this machine cannot be started using vSphere client with following error:

Cannot open the disk '/vmfs/volumes/4a365b5d-eceda119-439b-000cfc0086f3/examplevm/examplevm-000002.vmdk' or one of the snapshot disks it depends on.

Further troubleshooting required me to SSH into the ESXi host and analyze the vmware.log under datastore for this VM and I found following error:

DISKLIB-CHAINESX : ChainESXOpenSubChainNode: can't create multiextent node 6b8b4567-MyServer-flat001.vmdk failed with error The system cannot find the file specified (0xbad0003, Not found)

It turn out that the multiextent module is not loaded inside ESXi 5.1 and following command fix my problem:

$ vmkload_mod multiextent
Module multiextent loaded successfully

Add the command into /etc/rc.local.d/ to make sure it will auto start on boot:

/sbin/vmkload_mod multiextent

Once done, try to turn on the VM once again using vSphere client.


4 thoughts on “ESXi 5.1: can’t create multiextent node Error

  1. Thanks for posting, this fixed our problem too. FYI in case anyone else comes across this – there is no /etc/rc.local.d folder in ESXi 5.0.

    I’ll continue looking for how to auto-start it


  2. Hi

    Do you know if there’s a way to convert a VM disk from Multiextent without causing down-time to the VM? All documentation I find online suggests cloning out the disk but this requires downtime for the VM


    1. I am sorry, I do not have any resource or experience as per requested.


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