2 Replies Latest reply: Jul 22, 2014 11:14 AM by Jason Benway RSS

    Failed to Delete vCenter Snapshot

    Jason Benway Adventurer

      I've been getting a warning on both our dev and prod arrays about not being able to delete a vcenter snapshot.

      Failed to delete vCenter snapshot associated with volume collection ESX-Collection schedule ESX-Daily since the vCenter virtual machine snapshot tasks have not yet completed.

       

      I found another post here talking about too many vms on a volume with a recommendation of around 10-12 vms per volume and the discussion went on to talk about queue depth extra...

       

      I'm guessing that's my issue I run many more vms per volume.

       

      this is our first time with storage level snaps. Before with our EMC we didn't pay for them.

      I don't replicate the nimble snaps I'm just doing them once a day because I can.

       

      In prod I have about 220 vms, so I would need about 22 volumes to keep around 10 vms per volume... That's a lot more to manage

       

      jb

        • Re: Failed to Delete vCenter Snapshot
          Nick Dyer Navigator

          HI Jason,

           

          Yes indeed this error may be the case of having to many VMs in a datastore. I think this may be a good point to re-evaluate your storage snapshot strategy, as it may be that only a percentage (say 20% of the 220) only really require consistent snapshots, whereas the rest may be perfectly fine with non-consistent snaps.

           

          By doing the above it will help you create two levels of datastore, which are part of two separate Volume Collections (one which has syncronised snapshots, one which doesnt). Therefore you wouldn't neccessarily need to follow the best practice of 10-12 VMs per datastore, as the majority would be happy doing what you're doing today.

           

          Also the "10-12 VMs Per Datastore" comment isn't just for snapshots, it's an overall Best Practice for ultimate performance & latency. Here's a great blog post by Jason Boche who really went into detail about why this is: VAAI and the Unlimited VMs per Datastore Urban Myth » boche.net – VMware vEvangelist