Very slow performance after installing RAID controllers

Bill Moran wmoran at
Thu Oct 25 10:33:45 GMT 2001

On Thursday 25 October 2001 12:57, Thomas Cameron wrote:
> (sigh)  I don't "blame" Samba at all.  I just know that this list
> membership has a lot more experience than I do, and I hoped that someone
> might have insight.

Sorry if I came across a bit harshly ... I didn't mean to be that way.

> > Yes, but if you FTP/scp or do any other kind of _network_ copying (other
> > than through samba) how does the performance look?  If it looks as crappy
> > as the samba performance, then you need to look at your network config
> > before bothering with samba.
> ftp is also sporadic.

So it's probably not samba related, but more OS/HW related.

> I have already swapped out network cables and changed ports on the switch.
> I have also rearranged the SCSI cables.  Nothing seems to work.  I have a
> gut feeling that the network card driver is flakey.  But, I have recompiled
> three versions of the Linux kernel, with the NIC driver compiled as a
> module and directly in the kernel and it hasn't changed anything.

I don't evny you.  Problems like these are often a royal SOB to resolve.
Someone else recommended switching PCI slots.  If you have the resources, try
a different brand network card.  Make sure the net card isn't sharing an interrupt
with another card.  That interrupt sharing works occasionsally, but now always
(in my experience)  Maybe post the a question to some Linux lists about that
network card and see if others are having problems.  Install FreeBSD instead
(I'm not showing any OS bias, am i? ;)
I've heard stories about a card running full-duplex while the switch runs half-
duplex causing a lot of trouble, but never come across that exact problem myself.
If there's any hardware that you can temporarily remove from the machine, try
removing it - conflicts come from the weirdest places at times.

I'm just throwing out lots of ideas.  It sounds to me like you're already on the right
track, but it may take a bit of digging to get the exact problem.
I hope I've been some help.  Good Luck.

Bill Moran
Potential Technology technical services
(412) 793-4257

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