Hi Raghavendra, Thanks for the response. I played with it a bit today, but I don't have any good news - see below. On Tue, 2010-01-05 at 19:18 +0400, Raghavendra G wrote: > > * Do you run into same problems without performance translators > (write-behind, io-cache)? Unfortunately it does it with both disabled. I ran tcpdump the machine which was playing up and there didn't appear to be any traffic, either locally or to the other servers. > If you don't face any problem after removing performance translators, > Is it possible to pin point which among write-behind and io-cache is > causing the problem (Again by retaining only one of > write-behind/io-cache)? Also is it possible to find out whether the > client or server process that is using too much of cpu ("top" may help > here)? Sorry, I should have been clearer, it is the glusterfs client. glusterfsd never seems to go above 10% even under load. it is only 1 glusterfs process and it max's out a whole core. Cheers Dave