VMWare ESXi 5.1: increase size of guest OS virtual disk greyed out

I've got an ESXi 5.1 host running a SBS 2011 guest OS.  I need to increase the size of one of the virtual disks in that OS.  I've powered down, logged in as a user with admin rights to the client, but the functionality to increase the disk size is greyed out.  

The name of the VMDK is servername-000001.vmdk, so I assume a snapshot is involved?  I've checked the snapshot manager and there is a snapshot for Veeam (which I do use for backup).  

I didn't want to go any further and possibly cause problems with the backup by deleting the Veeam snapshot.  

Am I on the right track here?  Suggestions?

Thanks
SupermanTBAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
...so I assume a snapshot is involved?

correct...you will have to remove the snapshots then you will be able to increase the disk size
unless you are also using an IDE disk, the snapshot is the only blocker here
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SupermanTBAuthor Commented:
will removing that snapshot cause problems with the Veeam backup?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Looks like someones has got a snapshot attached....to their VM...

It will not cause problems for Veeam backup...

see my EE Article

HOW TO: VMware Snapshots :- Be Patient

But you will want to deal with the snapshot correctly.

1. Take a new snapshot.
2. Wait 60 seconds.
3. DELETE ALL the Snapshot function.

Wait and Be Patient, but make sure you have free datastore space, before proceeding....

and Be patient, whilst it merges to the parent.
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SupermanTBAuthor Commented:
Thanks for that very helpful link Andrew.  That appears to be my exact situation.  I have a follow up question just to be 100% sure.

My VM definitely appears to be running off that snapshot.  I read in your article that the original VMDK gets set to read only with the new snapshot VMDK acting as a delta.  That being said, you're saying that it's OK to delete that snapshot VMDK file?  Will deleting that file by the process you document put all the data in that delta file into the original VMDK or something along those lines?

Thanks very much.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
DO NOT DELETE THE FILES MANUALLY.

You *MUST* follow the correct procedure to merge the delta into the parent.

The procedure is:-

1. Right Click VM
2. Select Snapshot
3. Take a snapshot. (enter name and description, no need to tick any boxes!)
4. Wait 60 seconds to 2 minutes.
5. Right Click VM
6. Select Snapshot Manager
7. Click the DELETE ALL button to merge/commit the snapshot into the parent disk.
8. Be patient and wait....

depending on snapshot size and how long your VM has been writing to the delta snapshot, it could take seconds, minutes, hours, days or weeks to merge!!!

But it will....it could stick, and appear to hang at 90%, 95%.....wait it out, be patient...

BUT whatever you do, do not mess, cancel, restart VM, Host, Network Management Agents...

Don't look at the screen waiting, go for a walk, go home, get a coffee, get a burger.....

be Patient!
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SupermanTBAuthor Commented:
Thanks very much!  Very helpful
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SupermanTBAuthor Commented:
I closed the question b/c i got a very thorough answer from an expert
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