I've narrowed it down to an issue with the "quiesced" parameter. It
does not matter if the RAM is snapshotted, so I'll leave that out.

Creating a snapshot without quiescing works fine:

~ # time vim-cmd vmsvc/snapshot.create 128 TestSnap Blah 0 0
Create Snapshot:
real    0m 2.07s
user    0m 0.20s
sys     0m 0.00s

However, turning on "quiesced" will fail:

~ # time vim-cmd vmsvc/snapshot.create 128 TestSnap Blah 0 1
Create Snapshot:
Create snapshot failed
real    0m 16.29s
user    0m 0.23s
sys     0m 0.00s

After this the VM will become unresponsive and the console displays
lots of messages like this.

task xxx:123 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this.

I will install a VM with the supported tools to check that it works there.
I'll file a bug report for Ubuntu's open-vm-tools package.


On 28 July 2010 23:54, Marcelo Vanzin <mvan...@vmware.com> wrote:
> On 07/28/2010 02:36 PM, Dyonisius Visser wrote:
>>> The only thing I can guess here is that you have the vmsync module loaded. 
>>> Check
>>> it with "lsmod", and disable it if it's loaded; it's currently an 
>>> experimental
>>> module and has some issues in current releases.
>>
>> By just removing the vmsync module, I get this in Vcenter when trying
>> to backup with VCB:
>>
>> "Create virtual machine snapshot Wowza
>> Cannot create a quiesced snapshot because the create snapshot
>> operation exceeded the time limit for holding off I/O in the frozen
>> virtual machine.
>
> Have you tried with the official VMware-distributed Tools?
>
> As I mentioned before, the Tools distributed by Ubuntu are based on unstable
> snapshots of our internal source code, and there might be issues since they've
> not been through our internal QA testing.
>
> This is probably something that will be fixed in the development cycle leading
> to the next stable VMware release, but is not something that's guaranteed to
> work with these unstable snapshots.
>
> --
> - Marcelo
>

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