> De : THIELL Stephane <[email protected]> > > J Alejandro Medina a écrit : > > When copying data from one filesystem to the other we experience > > excessive broadcast messages. The network crawls down to its knees > > until both filesystems stop responding. > > > > If we test both filesystems separately we do not see this behavior. > An idea could be to reduce your lustre client max_cached_mb value > (per-filesystem value). By default, it is set to 2/3 of available system
> memory so it's not optimal when mounting multiple lustre filesystems on > the same node, especially when copying data from one to the other. > > see /proc/fs/lustre/llite/*/max_cached_mb > Looking at the code (lustre 2.0) it appears the max_cached_mb tunable has no effect. I have found LU-141 "port lustre client page cache shrinker back to clio" that tracks the problem. -- Grégoire PICHON Bull
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