Netapp have advised we have uneven distribution of load on the aggregate and I'v been running forced physical reallocates on each of the volumes on the aggregate in an attempt to eliminate this.
They also advised we have misaligned VMs which are more of a challenge to sort out.
It looks to me as though some thread on the Filer caused the whole Filer to stop responding but Netapp are unable to confirm this is a bug without a perstat. I recently read that Netapp advise running perfstats continually as it can have a detrimental performance impact. Bit of a catch 22.
I've added some more disks and spread the load across the two controllers in an attempt to reduce the load. I'm not convinced this is purely a load issue though as the Filer has been busier without any issues.
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