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тАО06-08-2009 10:47 PM
тАО06-08-2009 10:47 PM
Dual FC Path failure stalls VM guest server
I have the following setup.
Two DL380 G5 servers each with 2 FC HBAs, attached via switches to an MSA1500.
ESX u4 is installed on both servers, and the MSA1500 is running V7.00 FW Active/Active.
I have a single LUN used as a VMFS Datastore presented to both servers where my guest servers live. The Esx servers are able to access the LUN via either HBA, when failover was tested,breaking one fibre path at a time.
I decided to see what would happen if both paths failed and found the following.
The guest server does not fail over to the other Esx server.
The guest server "appears" to respond to pings.
But when attempting to open a console there is a message across the top of the console window that there is no path to the guest servers disks.
My question - Is this a limitation of VMware HA, or is there something I should be tweaking to enable guest server failover to the other Esx server.
ta
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тАО06-09-2009 07:41 AM
тАО06-09-2009 07:41 AM
Re: Dual FC Path failure stalls VM guest server
It only kicks in if no heartbeats from an ESX server are received for some time.
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тАО06-09-2009 09:41 AM
тАО06-09-2009 09:41 AM
Re: Dual FC Path failure stalls VM guest server
Steven
HP Master ASE, Storage, Servers, and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5, vSphere 6.x)
RHCE
NPP3 (Nutanix Platform Professional)
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тАО06-09-2009 10:15 AM
тАО06-09-2009 10:15 AM
Re: Dual FC Path failure stalls VM guest server
But this is a 'ping timeout' between service consoles - is does not detect if a VM 'hangs' due to storage problems.
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тАО06-09-2009 10:12 PM
тАО06-09-2009 10:12 PM
Re: Dual FC Path failure stalls VM guest server
I had adjusted the heartbeat settings, but there was no difference, as Uwe mentioned it's based on a "ping" response.Seems that only if the comms are affected, only then fail over happens.
thanks for the replies
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тАО06-09-2009 11:30 PM
тАО06-09-2009 11:30 PM
Re: Dual FC Path failure stalls VM guest server
So If you have 2 ESX Hosts and one of them goes off, then depending upon the resource pools and HA policies the other ESX will try and start those VM's which are suppose to be started.
There is a heartbeat connection between both the ESX boxes and once the heartbeat is lost the other ESX will try and start the VM's which are defined as per HA policy.
So HA Clusters the ESX Boxes and not the VM's living inside them.
Regards,
Sunny
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тАО06-15-2009 02:15 PM
тАО06-15-2009 02:15 PM
Re: Dual FC Path failure stalls VM guest server
With this Microsoft Clustering will literally go for a TOSS.
Regards,
Sunny
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тАО06-15-2009 08:55 PM
тАО06-15-2009 08:55 PM
Re: Dual FC Path failure stalls VM guest server
As of today there are many limitations (latest processors required for the lockstep, one vCPU per VM, must have enough bandwidth on the FT logging link, ...) -- so it is not just a matter of flipping some bits...
Or did you talk about some enhancements of VM HA? I am not confident it will really deal with all kind of failures at the storage layer. Last time I checked it just looked at the VMware Tools heartbeat.