While we were using Netapp Provisioning Manager to migrate vFilers from an older 3040 to a new 3170, we ran into a bug causing the netapp head to drop off the network.
On the RLM console I observed many failed operations with the message:
error=No buffer space available
After consulting with Netapp support the recommendation was apply the solution for BUG 90314:
Specifically setting these hidden options to de-prioritize volume deletion related operations (these ops had swamped the netapp during an aborted vfiler migrated (that's another related issue))
options wafl.trunc.throttle.system.max 30
options wafl.trunc.throttle.vol.max 30
options wafl.trunc.throttle.min.size 1530
options wafl.trunc.throttle.hipri.enable off
options wafl.trunc.throttle.slice.enable off
So far, we have not seen the issue again.