First off, I want to thank everyone for the helpful replies:
Hope I didn't miss anyone. The problem was that file reads from the E4500
were excrutiatingly slow, in the neighborhood of 5-30KB/sec. Writes to the
same machine were very fast.
As most of you suspected, the problem was with half vs. full duplex. I had
checked the setting of the card with "ndd /dev/qfe link_mode" and it
reported 1 for full duplex so I didn't think that was the problem. The
solution was provided by Ric Anderson, who told me to do the following
before checking the card:
ndd -set /dev/qfe instance 0
After executing this, another check of link_mode returned 0. I guess I had
been looking at the wrong port on the qfe card? I'm still not sure what
instance refers to. In any case, I reset the interface with the following
set of commands provided by Chandra Kalle:
ndd -set /dev/qfe adv_10fdx_cap 0
ndd -set /dev/qfe adv_10hdx_cap 0
ndd -set /dev/qfe adv_100fdx_cap 1
ndd -set /dev/qfe adv_100hdx_cap 0
ndd -set /dev/qfe adv_autoneg_cap 0
and added a corresponding set of commands to /etc/system, provided by
Michael Miller, so that the 4500 will come up the same way next time it is
Hardwiring the card to 100mbit full duplex in this manner fixed the problem
- read access is now blazing fast.
Finally, Bill Hathaway suggested applying patch 105379-6 which deals with
slow nfs reads. I checked my installed patches with patchadd -p | grep
105379 and this patch is not present. Next time I do a level 0 backup on
this sytem I will apply the patch, set the card back to auto and see if the
problem is still there.
Here is my original message:
> We are having a problem with our E4500 system. It is running Solaris 2.6,
> has 6 cpus, 6GB RAM, and is attached to an A5200 disk array via gigabit
> ethernet. We are using Veritas Volume Manager, but I don't know the
> details of how the volumes are set up at this time. The system and LAN
> are lightly loaded.
> The problem is this: any time a file is read over the network from this
> machine, the transfer rate is extremely slow. Anywhere from 5 to 30 KBps.
> Writes are at normal speeds of 1000-6000KBps. This was tested using FTP.
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