[gpfsug-discuss] High I/O wait times

[Jonathan Buzzard]

On 06/07/18 02:11, Buterbaugh, Kevin L wrote:

[SNIP]
> 
> The hardware setup is a vanilla 8 GB FC SAN.  Commodity hardware for
> the servers and storage.  We have two SAN “stacks” and all NSD
> servers and storage are connected to both stacks.  Linux multipathing
> handles path failures.  10 GbE out to the network.

You don't mention it, but have you investigated your FC fabric? Dodgy 
laser, bad photodiode or damaged fibre can cause havoc.

JAB.

-- 
Jonathan A. Buzzard                         Tel: +44141-5483420
HPC System Administrator, ARCHIE-WeSt.
University of Strathclyde, John Anderson Building, Glasgow. G4 0NG