iSCSI NetApp FAS storage controllers were recently updated, now hosts take eternity to boot and are semi unresponsive unless we unpresent the NetApp FAS then they spring to life

[lukeglazebrook]

Not sure if anyone has experienced this issue before but any advice would be greatly appreciated.  Our iSCSI NetApp FAS storage controllers were recently updated, now hosts take eternity to boot and are semi unresponsive unless we unpresent the NetApp FAS then they spring to life.  They tend to hang during boot on "nfs client loaded successfully" although we are using iSCSI in this instance.

In addition when they are presented after boot to a single host the LUN can be seen and attached but after a fall re-scan the datastores and subsequent VM contents do not return.  We are currently engaged with VMware support who have been helpful but we are running out of idea's

[lukeglazebrook]

Update we just tried presenting the same storage to a completely different host in another cluster with the same results, so far it definitely looks like the storage.

[lukeglazebrook]

For anyone curious it appears to be the storage controllers are at fault, iSCSI latency for other clients is up to 7 seconds!

[adgate]

For the case, is there any chance to contact NetApp Support Team? Since is a blackbox, I would consider a call to support.

Also check the networking whether it is a cabling or a switch problem.