Hi Folks: I'm hoping someone has some pointers here because I'm running out of ideas and everyone here is somewhat frustrated.
Regular mode of operation, eh? :-) A couple of weeks ago we had one of our server's motherboards begin to flake out. Before it actually died I moved this server's functionality to another server. The new server was now acting as a mysql database server and a NFS file server. So, old server - Occam - was flaking out. Before the motherboard started dying we had what everyone thought was decent performance on the machine. New server - Harmonia - now has Occam's duties as a mysql server and NFS file server. Harmonia is a machine that is at least twice as good as Occam in all respects save disk storage, but she's acting in a lot of respects like a Commodore 64. :-( Harmonia's specs: Dual AMD opteron 3.2Ghz duo core (4 processors) 6 x 2GB ECC DDR2 PC5300 RAM (12 GB) 8 x 500GB Seagate SATA300 32MB cache 7200RPM drives setup as RAID 5 (3.5 TB) Running Fedora 10 I seem to have three problems. 1) I can't seem to copy anything with regard to this machine without its load average going through the roof. An scp, even a cp will drive the computer's load average to between 12 and 18. Copying a large file, or doing a mysqlhotcopy, will make the load average slowly climb, with some spikes up to that level. I can't think that's right. Not for something with 4 processors. 2) Whenever the load average goes above, say, 5 NFS starts seriously flaking out. It goes "bye-bye," stops responding, and starts disconnecting disks at the clients. After the load average goes down, it will come back. NFS exports is here: /BigBang *(rw,insecure,sync,nohide) /mnt/data *(rw,insecure_locks,nohide,insecure) /mnt/data is our RAID drive. /BigBang is an alias to /mnt/data/BigBang 3) Finally, network performance is completely in the toilet. Copying files via scp, or rsync, in addition to driving the load average up, seems to go at a rate of 2.5MB/s. I have two gigabit ethernet cards in this machine. These are wired to a gigabit switch. The switch is wired to the rest of the office via a 100Mbps hub, but the issue is we got far better transfer performance from the old server (Occam) than we are from the new, faster server (Harmonia) and I can't figure out why. Any pointers? Any thoughts? I'm looking forward to meeting folks on the 9th. --- Richard 'Doc' Kinne, [KQR] American Association of Variable Star Observers <rkinne @ aavso.org>
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