Hi Philips, > I met a Samba over PVFS2 prolem.So would anybody help me please? > I use the pvfs2 file system and export the files with Samba.The hardware > are two JBOD with > 146G 10k FC disk, 4 pvfs2 IO servers,8 pvfs2 clients and some windows > clients.Every IO server > manages 6+1 RAID5.the stripe size is 64k. > My problem is that How can we tuning the read/write performance of this > system ? > this architecture,I test the performance with 2G files.and find the read > performance is fast,but the > write performance is bad.Would you tell me what should be care about > Samba over PVFS2?
Can you verify whether PVFS2 performance (no Samba export, just native PVFS2) is bad on your setup first? What benchmark did you use to measure the performance on your system? Just wanted to make sure that it is a pvfs2 performance problem and not a samba tuning issue.. I suspect what might happen with writes is that the VFS/smbd writes out single pages and hence PVFS2 sees only 4K/8K bytes at a time. Due to the absence of any client-side caches, multiple round trips ensues and performance drops. Can you check if the smbd server uses pvfs2 writev function instead of write? (perhaps by strace'ing the server?) thanks, Murali _______________________________________________ Pvfs2-users mailing list [email protected] http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users
