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тАО07-30-2010 11:37 PM
тАО07-30-2010 11:37 PM
P4000 failover
I have a P4000 cluster with 2 nodes and a failover manager. On each server there are running several VMs. When I do a failover test by powering off the VSA VM on Server1 the storage stays available for all VMs on Server2 and they continue their work without a failure.The Vms on Server1 stop responding. but stay powered on. The ESX on Server1 also shows the storage with status "normal" but it is not browseable.When I power on the VSA VM on Server1 again all VMs on Server1 continue their work without a problem.They don't even have to be restartet.
Is that a normal behavior?
Thanks in advance,
madmax.
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тАО08-02-2010 03:30 AM
тАО08-02-2010 03:30 AM
Re: P4000 failover
This pause state will also occur when the management node that handles the VIP goes down as well.
For your situation though, are you using Network RAID 2 or higher?
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тАО08-02-2010 05:39 AM
тАО08-02-2010 05:39 AM
Re: P4000 failover
I'm using network raid 2. Is it the same behavior with 3 storage nodes?
madmax
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тАО08-02-2010 06:30 AM
тАО08-02-2010 06:30 AM
Re: P4000 failover
Nonetheless, if you have three nodes in a cluster and use NW Raid2, with one node failure...everything should continue to function just fine. You may see a blip in access, where the machines will pause (<30 seconds or so), if the node that fails holds the VIP.
The behavior you have seen is "normal" when the storage is not available.
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тАО08-02-2010 06:51 AM
тАО08-02-2010 06:51 AM
Re: P4000 failover
Hope it is a little bit clearer now. :-)
madmax
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тАО08-02-2010 09:31 AM
тАО08-02-2010 09:31 AM
Re: P4000 failover
As for your situation, that sounds familiar to a problem we had a few years ago when we didn't have the load balancing option set on the Server properties of the ISCSI connection in the CMC. You may want to make sure it is set.
Generally, your storage should continue to function if the other VSA's and your FOM continue to work (since you have NW Raid 2). Everything may freeze for a very short time as soon as the VSA goes down, but it should then continue to function when it fails to the still functioning VSA.