ESX 5.0 - Task virtual machine disks consolidation succeeded


We have a ESX 5.0 , and we found in events some task "Virtual Machine disk consolidation succeeded", and have some questions:

- What is this?
- In some case the VM that are processing this kind of task are unavailable for a few seconds/minutes, Why?
- When this task will be launched? Can I scheduled it?

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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Are you using snapshots, or third party backup applications, that are leaving snapshots on the datastore, and later the virtual machines disks, required disk consolidation?

Snapshots can be scheduled from vCenter, to Scedule a Consolidation task would need a script using PowerCLI.

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If you have Veeam, vDR (VMware Data Recovery), or any other backup solution as mentioned above by @hanccocka, you more than likely have automated backup and/or replication jobs running. When they run, they create a snapshot of the VM that you're backing up or replicating. When the job is done, it will delete the snapshot file, which commits the data attained in the snap (delta) file to the parent virtual disk (or snap). Then, once all data is committed, the delta file (snap file) is deleted.

lnriveraAuthor Commented:
And how can I schedule the consolidation task?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Why do you need to Consolidate, you get a warning when you need to Consolidate, you can only Consolidate if you have leftover snapshots?
lnriveraAuthor Commented:
I dont wan't to consolidate, the problem is that the consolidation task run in a unexpected time and in some case have a impact in the performance of the VM.

The VM doesn't has snapshots open
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Check the datastore.
Do you have a VM image backup running or scheduled?
lnriveraAuthor Commented:
Yes, I use trilead backup software
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
This will be the issue.
Then check your b/u schedule
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