Hi,
Lets assume for a second that the host has been network isolated but a master doesn’t own the datastore on which the VMs config files are stored, what happens? Nothing happens. Isolation response will not be triggered as the host knows that there is no master which can restart these VMs, in other words there is no point in powering down a VM when it cannot power it on. The host will of course periodically check if the datastore is claimed by a master.
There’s also a scenario where the complete datastore could be unavailable, in the case of a full network isolation and NFS / iSCSI backed storage for instance. In this scenario the host will power off the VM when it has detected another VM has acquired the lock on the VMDK. It will do this to prevent a so-called split brain scenario, as you don’t want to end up with two instances of your VM running in your environment. Keep in mind that in order to detect this lock the “isolation” on the storage layer needs to be resolved. It can only detect this when it has access to the datastore.
I guess there’s at least a couple of you thinking but what about the scenario where a master is network isolated? Well in that case the master will drop responsibility for those VMs and this will allow the newly elected master to claim them and take action if required.
I hope this clarifies things.
In case of any doughts kindly provide the vxpd logs if possible for more accurate results
Thanks n Regards
Umesh Ahuja
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