Re: Hosts losing access to NFS share

Depending on your setup you might also want to check Flow Control settings on connected pSwitches and host pNICS.. According to NetApp flow control should now be disabled on modern network gear...

 

From: http://media.netapp.com/documents/tr-3749.pdf

 

"For modern network equipment, especially 10GbE

equipment, NetApp recommends turning off flow control and allowing congestion management to be

performed higher in the network stack. For older equipment, typically GbE with smaller buffers and

weaker buffer management, NetApp recommends configuring the endpoints, ESX servers, and NetApp

arrays with the flow control set to "send."

/Rubeck

fyi - We've been reviewing this flow control topic the past few weeks for our NetApp 3170's and have found that the setting is not supported on CNA cards (only works with plain 10Gb NICs without the extra FCoE chip).  We'll be installing some new cards [on the NetApp heads] and will test in January.  We currently have flow control up and running on a newly deployed 3240 (connected to Nexus 5k's) and it seems to be working.