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I'm sure you must relalise that the reads are from memory and not disk! Plus, to compare GFS and ext3 you must use the same locally mounted disk for both tests - GFS used to support nolock for this sort of thing, don't know if it still does. What speed is the LAN over which you ran NFS? If it's Gigabit then something is very wrong with your network! On Fri, 2004-07-30 at 23:11, Marc Swanson wrote: > The part that surprised me was that GFS is actually FASTER than a > filesystem mounted LOCALLY via ext3(!) > Direct local SCSI disk I/O (ext3): > --------------------------------- > write avg: 25.119 MB/s > write latency(max): 47.387ms > read avg: 926.569 MB/s > read latency(max): 0.118ms > > Open GFS + OpenDLM (node 1, both nodes mounted): > --------------------------------- > write avg: 21.315 MB/s > write latency(max): 118.683ms > read avg: 433.675 MB/s > read latency(max): 0.179ms > > Open GFS + OpenDLM (node 2, both nodes mounted): > --------------------------------- > write avg: 18.963 MB/s > write latency(max): 285.325ms > read avg: 684.217 MB/s > read latency(max): 0.090ms > > (For Redhat GFS, a third machine NOT connected to > shared storage is required as a lock server) > Redhat GFS 6.0 (RLM External, 2 mounted nodes) > -------------------------------- > write avg: 42.966 MB/s > write latency(max): 171.008 ms > read avg: 921.468 MB/s > read latency(max): 0.106 ms > > NFS (only 1 node mounted): > --------------------------------- > write avg: 0.270 MB/s (!) > write latency(max): 10558.377ms (!!) > read avg: 495.731 MB/s > read latency(max): 0.152ms > > > > We all know the performance issues with nfs.. but _WOW_.. I've never > actually run numbers on it before. > ------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 _______________________________________________ Opengfs-users mailing list Opengfs-users@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/opengfs-users