vCenter - maximum number of concurrent tasks

[Danooo]

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Hi All,

I have a question regarding maximum number of concurrent tasks in vCenter. We

are in the process of developing a tool which will automatically clone multiple

virtual machines from templates and when we apply few cloning tasks at the same

time, some of them starts immediately and some wait in the queue (you see only

in progress status). The thing is that number of concurrent tasks changes -

sometimes we can clone only two VMs at the same time (the rest wait in the queue)

and sometimes it is three, four or even five tasks that run simultaneously.

This number changes randomly. The VM's that are in the queue runs once

current task is finished. Does vCenter manage the tasks intelligently ? Do you

have any idea what’s happening? Any answer will be appreciated.

Daniel.

[AndreTheGiant]

See: http://www.vmware.com/pdf/vsphere4/r40/vsp_40_config_max.pdf

Andre

[RParker]

I think the limit is based upon LUN. so if you clone 4 VM's at the same time, and the VM's are on different LUN's, all 4 can run.

If however 3 of the VM's are on the same LUN, only 2 will run concurrently. I am pretty sure it's based upon the LUN activity.

[Danooo]

Hi Guys,

Thanks both of you for quick answer.

Andre - unfortunately I couldn't track the information about concurrent cloning tasks in pdf file which you have provided. Maybe I missed something?

RParker - well this theory would have a sense, but in our case we keep all templates and VM's on the same LUN. This LUN is designed only for tests and only one person can perform tasks on that LUN. The thing is that sometimes we are able to start two simultaneous tasks and sometimes more - three or four tasks so this has no sense for me. If it is a LUN activity issue, is there any chance to change that somehow to perform more simultaneous cloning tasks on one LUN?