[Lustre-discuss] Problems with multiple lustre filesystems

[THIELL Stephane]

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

HTH,
Stephane Thiell
CEA