Dmitry, can you post your spec files (http://glusterfs.pastebin.com)? do you have write-behind on the client spec file? avati 2008/1/7, Dmitry Unkovsky <emagmon@xxxxxxxxx>: > > Hello. > > We are trying to setup a redundant glusterfs storage. But the main > problem in our case is a write speed, even with single client - single > server setup. With read speed about 75-80MB/sec, write is at best > ~30MB/s > from a single client (even with a server located on a local node > trough a unix/socket) with > relatively big files. Background writing on a remote node (which > happens with afr, for example) gives an additional slowdown. In a real > life clustered environment with concurrent access things can be a > little bit different, but the results we experience now do not look > good, anyway. > > We've tried nearly any combination of performance translators > options, booster, parallel and sequential writing with /bin/cp, /bin/dd > with different block size and such. > > A quick, not too deep look at the code was not enough to find a place > that can cause such drop of write performance comparing to read. Can > you give a > hint where to dig further or what could be tweaked in the code to > improve this situation? This could be our simple mistake or > or some misunderstanding. > > Also, it would be nice if someone would share his results on read/write > speed in a simple one client / one server setup (tcp or unix socket) > with and without performance translators. This wold give an idea of > what others can expect and where is a point to stop tunning things =) > > Test systems have current version from tla with fuse-2.7.2 patched with > a little bit adjusted patch for fuse 2.7.0. They are AMD Athlon64 > 4200+/2GB RAM/200GB SATA 7200RPM HDD each, connected with gigabit > Ethernet. Host itself is capable of sequential reading from HDD at > ~100MB/s, writing at ~90MB/s. Ftp reads are around ~90MB/s, writes > ~75MB/s from a remote host. > > P.S. > Thank you for your project! > > > _______________________________________________ > Gluster-devel mailing list > Gluster-devel@xxxxxxxxxx > http://lists.nongnu.org/mailman/listinfo/gluster-devel > -- If I traveled to the end of the rainbow As Dame Fortune did intend, Murphy would be there to tell me The pot's at the other end.
