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тАО04-23-2009 01:40 AM
тАО04-23-2009 01:40 AM
VMware ESX what happens if a NSM node restarts
My question is that since each ESX server creates a single connection to one NSM node to access a volume what happens if that node fails, would the virtual machine stop and need to be restarted by HA or would it just pause while ESX connects to another node?
We run terminal servers and web servers and database servers so having them just die while in use would be a big issue.
Thanks
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тАО04-24-2009 05:05 AM
тАО04-24-2009 05:05 AM
Re: VMware ESX what happens if a NSM node restarts
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тАО04-24-2009 05:09 AM
тАО04-24-2009 05:09 AM
Re: VMware ESX what happens if a NSM node restarts
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тАО04-24-2009 05:38 AM
тАО04-24-2009 05:38 AM
Re: VMware ESX what happens if a NSM node restarts
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тАО05-20-2009 01:36 PM
тАО05-20-2009 01:36 PM
Re: VMware ESX what happens if a NSM node restarts
Is there any config parameter on the ESX side we should look at? Some sort of time out we can increase perhaps??
Thanks
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тАО05-20-2009 04:26 PM
тАО05-20-2009 04:26 PM
Re: VMware ESX what happens if a NSM node restarts
I have one LH cluster that you can lose a NSM node and it just reconnects to one of the other nodes in the cluster going on it's happy way. Assuming 2 way replication.
Then my other LH cluster, you lose a node and all hell breaks lose. Any volumes served off that node are not able to be seen by the ESX nodes no matter how many rescan or reboots you do in ESX. I have even deleted all the iscsi config files manually in ESX to try to resolve the issue. I also tried shutting down my entire second LH cluster. Eventually the LH cluster seems to fix things but it is many hours later.
So it depends on how your cluster reacts. It is supposed to work like my first cluster.
BTW, both clusters are running SANIQ7SP1 and the ESX is 3i fully patched.
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тАО08-24-2009 10:05 AM
тАО08-24-2009 10:05 AM
Re: VMware ESX what happens if a NSM node restarts
I am fortunate enough to have our setup work the same way (I.e. - Node failure has np/minimal impact on the VM) except... with our Solaris based VMs. All of our Windows VMs continue working as if it was nothing more than a hiccup, the Solaris VMs will exhibit the black screen in the console and require a reboot. I haven't yet figured out a way to resolve this other than to sVMotion the VM to a datastore that is not on the node that will be taken offline (assuming regular maint not random failure).
I reccomend ensuring you have the back end network setup correctly to avoid the issues others have seen. I've found that having it Gig-E, seperated w/ Jumbo frames ensures not only best performance during regular operating periods, but also great response during node failure/maintenance.
Tyler
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тАО10-16-2009 03:52 PM
тАО10-16-2009 03:52 PM
Re: VMware ESX what happens if a NSM node restarts
When we updated our clusters from San/IQ 7SP1 to 8, it resolved our issues with the cluster that would fail when it lost a node. Now both cluster successfully (and correctly) don't skip a beat when they lose a node.
Thanks,
Damon