search for: ost_io

...rst 20 nodes * 3ware 9650SE ML12 on last 10 nodes After the upgrade to 1.8.4 we were seeing terrible throughput on the nodes with 3ware cards (and only the nodes with 3ware cards). This was typified by see the block device being 100% utilised (iostat), doing about 100r/s and 400kb/s and all the ost_io threads in D state (no writes). They would be in this state for 10mins and then suddenly awake and start pushing data again. 1-2 mins later, they would lock up again. The oss''s were dumping stacks all over the place, crawling along and generally making our lustrefs unuseable. After try...

Hi, thanks for previous help. I have some question about Lustre RPC and the sequence of events that occur during large concurrent write() involving many processes and large data size per process. I understand there is a mechanism of flow control by credits, but I''m a little unclear on how it works in general after reading the "networking & io protocol" white paper. Is