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Re: Using "volume move" on cDOT8.3 to move large NFS volumes to another node non-disrupti

The host settings are applied correctly on all of our hosts.  We are still on ESXi 5.5, so that could be it.  The APD was in micro/seconds so it was "almost" transparent.  It occurred during the cutover phase of the vol move. 

Re: Using "volume move" on cDOT8.3 to move large NFS volumes to another node non-disrupti

NetApp Bug report 844098 desribes this issue:

 

 When using ESX/ESXi NFS clients with NetApp storage controllers, you might 
 experience the following issues:
 
 Issue 1: Intermittent NFS APDs on VMware ESXi 5.5 U1
 
 When running ESXi 5.5 Update 1, the ESXi host intermittently loses connectivity 
 to NFS storage and an All Paths Down (APD) condition to NFS volumes is observed. 
 
 This issue is resolved in ESXi 5.5 Express Patch 04. Refer to the VMware KB 
 articles http://kb.vmware.com/kb/2076392 or http://kb.vmware.com/kb/2077414 for 
 instructions to install the patch. 
 
 Issue 2: Random disconnection of NFS exports under workloads with an excessive 
 number of requests
 
 On some NetApp storage controllers with NFS enabled, you might experience the 
 following symptoms:
 
 - The NFS datastores appear to be unavailable (greyed out) in vCenter Server, 
   or when accessed through the vSphere Client.
 - The NFS shares disappear and reappear again after few minutes.
 - Virtual machines located on the NFS datastore are in a hung/paused state when 
   the NFS datastore is unavailable.
 
 This issue is most often seen after a host upgrade to ESXi 5.x or the addition 
 of an ESXi 5.x host to the environment.

 

 

Chasing down the bug report trail indicates that the 2nd issue is corrected in all up-to-date cDots.

 

If you will remain on ESX 5.5 and with NFS - you definitely want the indicated patch.  For me a typical data store is about 2-3TB used, higher end hits 8TB, all NFS, and I move them at will as needed without any concern for system load.  VMWare never notices anything out of the ordinary.

 

 

Hope this helps.

 

Bob Greenwald

Lead Storage Engineer | Consilio LLC

NCIE SAN Clustered, Data Protection

 

Kudos and accepted solutions are always appreciated.

Re: Using "volume move" on cDOT8.3 to move large NFS volumes to another node non-disrupti

I have just double checked our version of ESXi and we have 5.5.0 Build 31168595 (Update 3a).