VMs going inaccessible then accessible again

[jroper73]

We have a new NFS Storage that is much faster than our previous appliances.

However I am migrating a machine. And all the offline VMs on this new datacenter keep going inaccessible. Then after a while they will be accessible again. Up to half of the offline VMs can be inaccessible at a time. Sometimes only 1-2 machines are.

It does not seem to be affecting online VMs. There do not appear to be having performance issues.

I am Running ESX 4.1 and vcenter.

[marcelo_soares]

Check (and send us if possible) the /var/log/vmkernel logs from your host. You SHOULD be having some communication issues with the NFS of maybe with local disks that may be affecting your storage layer.

[jeff9565]

What storage vendor are you using?  I know that NetApp changes some advanced settings for NFS datastores for optimized performance.  I put these options below.  You may want to give these a try.

Net/TcpipHeapSize --int-value 30

Net/TcpipHeapMax --int-value 120

NFS/HeartbeatMaxFailures --int-value 10

NFS/HeartbeatFrequency --int-value 20

NFS/HeartbeatTimeout --int-value 10

NFS/MaxVolumes --int-value 128

Jeff

[jroper73]

We ended up switching software on the Remote Storage