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Strange Speed issues with XServe Raid ->Xserver->Afp Share

Hello all...

Running into a strange issue with read and write speeds to an xServe Raid shared from an xServeG4.

the RAID has both sides almost full with disks each side having around 1.4 TB of space. Both parts are RAID5.  The controllers are hooked into an XServe G4 with a factory shipped Fiberchannel Card. The G4 Xserve (running 10.3.9) shares this data over a Gigabit switch via its builtin ethernet port. (only one in use).

This is a strange issue... stumped me (hence the plea for help on the list)...

Using a simple app from Aja ( http://www.aja.com/html/support_kona3_swd.html) to test read/write speeds directly from the Xserve g4 desktop yields consistent speeds from each of the slices on the separate controller.  I get around 100Mb/70Mb write/read times using this method directly from the server (on each controller).

However when I tested connected to the server via an AFP share, one side of the RAID is mind-numbingly slow. The other side works just fine. This is only via AFP, works fine from the desktop. The server only has the single ethernet connections and all of the settings are identical on both sides of the RAID(cache etc etc) and all of the AFP shares involved.

Since the speeds directly from the desktop connected via fibre channel are fine for each controller, I am leaning towards ruling out the RAID as the culprit. (I'd initially suspected something fishy with one of the controllers before I realized it was fine directly on the server.)

This leaves the server as the next link in the chain.. Every other share from the server performs as expected (local disks and the one side of the RAID) but all the shares from that one side of the RAID is very very slow over AFP. I've tried creating new shares, double checking settings, conditioned RAID, fscked all the disks involved (actually caught a failing drive on the conditioning) but I am now out of ideas...

Problem just cropped up, had been working fine for a couple years... Going to try a clean install of 10.4 server to see if it might be some silly software problem, but I think I've ruled out a hardware issue with the RAID, the Fiber channel card, and the Xserve itself from the testing I've done (and everything else works just fine).

Anyone have any other ideas before I trying a clean install of 10.4.x server?


Thanks for any help.

Regards,
Chris H
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