I have a question about luster performance vs straight Linux file system performance. I am using the dt tools, which simply read and write large files. I have an OST and MDS and client all on the same machine. I have a Raid-5 (8 disks), partitioned into three partitions. The first partition is for my OST, the second my MDS, and the third just has an ext3 file system on it. The performance while reading/writing a 2G file on the ext3 file system is 42 MB/s and 60 MB/s, respectively. The performance while reading/writing a 2G file on the luster file system is 24 MB/s and 37 MB/s. So, reading and writing the my luster file system is significantly slower. Of course, I only have one OST, so I don’t get any gains from parallelism. However, I would think that the speed of a luster file system would be comparable to, if not faster than, the speed of a plain ext3. Any comments on this? Has anyone had similar or different results? A few additional details: All writes to the disk are flushed. I’m using aio. My machine has 2G of RAM, but I’m writing two separate 2G files (to separate locations on my disks), so I think I’ve minimized the Cache impact. Thanks. _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today - it''s FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/