Acronis backup not deleting snapshot on VMware virtual server

I am running VMware 5.5 on a single ESXi host that has 2 Windows 2012 R2 servers as well as the vCenter appliance and an Acronis appliance.  The server experiencing the issue is the Windows Exchange 2013 server.  I have Acronis 12.5 running backups on these two servers.  Since upgrading from Acronis vmProtect9 to Acronis 12.5 it has been creating snapshots on the Exchange server but not deleting them.  I am now prompted to consolidate my disks for this virtual server but there appears to be a lock on the .vswp file.  I rebooted the ESXi host but the lock still remains.

This customer is current on VMware subscription maintenance but not on the support.

Any help would be greatly appreciated.  I'm a little worried about doing too much because unknown to me they have only been swapping 2 drives in their backup rotation.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Please check if the Acronis VM or Appliance has got the parent virtual disk attached to it, and whilst the parent disk is attached, you will not be able to consolidate the snapshot.

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blkfootAuthor Commented:
Sorry.  What do you mean the appliance has got the parent virtual disk attached?

Thanks for your response.
blkfootAuthor Commented:
Ok, I see what you mean about the virtual server disks showing as attached to the Acronis appliance.  Is it okay to just remove those disks from the appliance without corrupting anything?  There are no backups running.
Acronis True Image 2019 just released!

Create a reliable backup. Make sure you always have dependable copies of your data so you can restore your entire system or individual files.

Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Correct, remove from the appliance virtual disks that are supposed to be attached to other VMs!

(do not delete from disk!).

Leave Acronis disks attached.

This should then let you consolidate the snapshots.

and a trick here do the following...

1. Take a new snapshot.
2. Wait 120 seconds.
3. Select DELETE ALL
4. Be Patient and Wait.

Whilst snapshot is consolidating, see my EE Article I wrote.

HOW TO: VMware Snapshots :- Be Patient
blkfootAuthor Commented:
THANK YOU, Andrew!  One last question and then I will close this and award the points to you.  I'm not sure I have enough space to take another snapshot.  Can I just consolidate and can I do that during business hours without impacting the customer?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
The danger is as the VM writes to a snapshot, if it fills up your datastore the VM will fail and power off, which could cause corruption.

It's doing that NOW...

You should shutdown the VM NOW, and ACT!

Consolidation can cause performance issues, if storage space is disappearing before you eyes, Act NOW!
blkfootAuthor Commented:
Thanks for the advice and the help.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
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