Hi, We had some users experiencing slow vim (the editor) updates on our Lustre homedirs. Turns out vim is doing some fsyncs that does not play well with a loaded ZFS OST.
We tried testing with ioping, which does synced writes (like dd with conv=fdatasync). When an OST is loaded (i.e. scrubbing) the ioping time is multiple seconds (5-10). Without load we get 100-300ms, which still is far from what a ZFS fs can deliver. To test if a ZFS fs also would be affected we created a test fs on the OST pool and ran ioping*. With or without a scrub running, the ping times averaged at around 40ms. Has anyone else experienced this? Can it be helped? Cheers, Hans Henrik * Used -WWW because ioping -W runs on an unlinked file and ZFS will not sync those to disk. _______________________________________________ lustre-discuss mailing list [email protected] http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
