[lustre-discuss] Lustre traffic slow on OPA fabric network

Kurt Strosahl strosahl at jlab.org
Tue Jul 3 11:59:22 PDT 2018

Good Afternoon,

   I've been seeing a great deal of slowness from clients on an OPA network accessing lustre through lnet routers.  The nodes take very long to complete things like lfs df, and show lots of dropped / reestablished connections.  The OSS systems show this as well, and occasionally will report that all routes are down to a host on the omnipath fabric.  They also show large numbers of bulk callback errors.  The lnet router show large numbers of PUT_NACK messages, as well as Abort reconnection messages for nodes on the OPA fabric.

Kurt J. Strosahl
System Administrator: Lustre, HPC
Scientific Computing Group, Thomas Jefferson National Accelerator Facility

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