high load when copy directory with many files

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hi,
we use glusterfs on a php application that have many small php files images etc...
We use glusterfs in replication mode.
We have 2 nodes connected in fiber with 100MBps and less than 1 ms latency.
We have also an arbiter on slower network (but the issue is there also without the arbiter). When we copy a directory (cp command) with many files, cpu usage and load explode raplidly,
our application become inaccessible until the copy ends.

I wonder if is that normal or we have done something wrong.
I know that glusterfs is not indicated with many small files, and I know that it slow down, but I want to avoid that a simple copy of a directory will put down out application.

Any suggestion?

Thanks a lot



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