Thanks for the hints.
No, I do not mount with -o noatime because some of our applications need
atime. Further this would only speed up reading, not writing.
I also tried the http://sourceware.org/cluster/faq.html#gfs_tuning
hints. -o noquota gives some aditional performance but only a few percent.
Supprisingly the 1000BaseTX network's bandwidth is not totally used at
all, just a small percentage.
Can the effect depend on network latency?
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