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тАО05-08-2011 02:20 PM
тАО05-08-2011 02:20 PM
VSA 2 Node Cluster + FOM
Hello, I am trying to eliminate the need to have the FOM on a third physical machine, is it possible for example to run the FOM as a virtual machine on the VSA cluster, then enable vsphere fault tolerance on it? if one of my nodes fails will FT activate the secondary fom in time to keep quorum and allow vmware HA to failover the rest of my vm's?
3 REPLIES 3
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тАО05-09-2011 01:48 AM
тАО05-09-2011 01:48 AM
Re: VSA 2 Node Cluster + FOM
We thought about this one with two physical nodes and a vSphere cluster. In teh end we did use the FOM as a VSA but disabled HA/FT on it and had the FOM on manual restart.
The problem with enabling HA/FT is that you run a very serious risk of 'split brain' with it. Say cluster node A loses contact with node B, then node B will spin up your FOM and the B VSA/B FOM will have quorum. But as A is still running but not talking to B, it will still have a FOM running and will also have quorum. Hence both nodes will function independantly, resulting in a potential split brain.
Also, we ran with the FOM on seperate mirrored SAN hardware. If you're talking about running the FOM from the VSA itself, then that's a whole other rats nest of issues, and I'm pretty sure thats not advised either.
The problem with enabling HA/FT is that you run a very serious risk of 'split brain' with it. Say cluster node A loses contact with node B, then node B will spin up your FOM and the B VSA/B FOM will have quorum. But as A is still running but not talking to B, it will still have a FOM running and will also have quorum. Hence both nodes will function independantly, resulting in a potential split brain.
Also, we ran with the FOM on seperate mirrored SAN hardware. If you're talking about running the FOM from the VSA itself, then that's a whole other rats nest of issues, and I'm pretty sure thats not advised either.
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тАО05-09-2011 01:50 AM
тАО05-09-2011 01:50 AM
Re: VSA 2 Node Cluster + FOM
Sorry, correction... we ran the FOM as a VM, not (obviously) as a VSA.
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тАО05-12-2011 07:55 AM
тАО05-12-2011 07:55 AM
Re: VSA 2 Node Cluster + FOM
No, FOM should not be on the SAN.
When the Host with the FOM goes down, your SAN will go down.
It is best to run it on a 3rd unit.
It can be run off a VMplayer which is free..
When the Host with the FOM goes down, your SAN will go down.
It is best to run it on a 3rd unit.
It can be run off a VMplayer which is free..
I work for HPE
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