David: When we were working on Brett's test here, we were told that in 2.8, you need to use a large block size, even if you are working with small files. 16K is much too small. We went to about 4MB.
Becky > Hello all - > > I'm having trouble figuring out a problem with performance depredation on > a > simple 10 node cluster. Prior runs on the cluster (before this problem > manifested itself) resulted in bandwidth and IOPS about 10 times higher on > a > small file creation workload. Each node is running as a metadata server > and > a data server. > > The problem is persistent between versions and installations of PVFS2 > 2.8.0 > and 2.8.1. Rebooting all of the nodes didn't improve anything. The > network > connections (simple GigE) showed no errors or dropped packets. Using > different physical disks (both SAS and FC) didn't improve things. The > kernel logs didn't show anything out of place nor did the pvfs2 server or > client logs. It seems like a network issue but I can't seem to find > anything wrong with any of the connections. > > Has anyone seen this kind of problem before? I seem to remember something > on the list before about performance suddenly dropping but I can't find > the > message now (of course). Any insight would be appreciated! > > Thanks, > > - Dave > _______________________________________________ > Pvfs2-developers mailing list > [email protected] > http://www.beowulf-underground.org/mailman/listinfo/pvfs2-developers > -- Becky Ligon PVFS Developer Clemson University 864-656-3865 _______________________________________________ Pvfs2-developers mailing list [email protected] http://www.beowulf-underground.org/mailman/listinfo/pvfs2-developers
