How many times is the locks on files updated (VMFS/NFS)?

If I understand correctly the ESXi host that is running a certain VM which has its files residing on shared storage must update the regularly filelock to show that he is alive and that he still owns the file. And if the host should fail filelock updates should stop appearing, which means that another host can start the virtual machine by using HA for example.

So my question is, how many times is that these locks to update the file? And is there a difference between VMFS and NFS in this case? (Also NFS using *.lck files to save the lock state, but the time interval).

From the top of my head, it's 15 seconds until the lock is declared dead and released. Indeed, this could be a race condition as HA will restart the virtual machines on the 16th second. Don't get me wrong, it is designed in such a way that it will work, but I still generally recommend increasing the das.failuredetectiontime.

Also, I think the locking area is updated about every 3 seconds.

Duncan (VCDX)

Available now on Amazon: vSphere 4.1 HA and DRS technical deepdive

Tags: VMware

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