On 03/01/2012 08:15 AM, m.roth at 5-cent.us wrote: > We just moved a user, who deals with a *lot* of data, to a new server, > since his old NFS home directory was on a disk that had started showing > problems. > > Now, i/o is about six times slower, my manager reports. > > After a fair bit of googling, I started looking at tc and ip, and found > the following: from ip address show, first, on the old home directory > server, > eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast qlen 1000 > then, on the new: > eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000 > > I've tried tc qdisc add dev eth0 mq pfifo_fast > and > tc qdisc add dev eth0 pfifo_fast > > and neither works. I've googled, and seen something about you can't set > something with tc, because pfifo_fast is the hardwired default. > > Anyone know how I can reset this, or is there a package I can reinstall > that would do that? > > mark > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos Are you sure your performance problems are network related? Have you measured performance of the filesystems on the two servers? You may have a data alignment problem with your disk partitions. Nataraj