Re: Symbios-NCR 6285-3621 + Adaptec 2944W multilun problem

[Mike Anderson <andmike@us.ibm.com>]

James Bottomley <James.Bottomley@SteelEye.com> wrote:
> On Fri, 2006-05-12 at 11:34 -0300, Gabriel Gomiz wrote:
> > I'm attaching dmesg output. I'm sorry I forgot to attach it in the
> > last 
> > email. The I/O errors occur when the devices are being detected and 
> > whenever I try to access them. For example to do 'fsidk -l /dev/sdc'.
> 
> Well, what I was hoping for was mode sense messages but, unfortunately,
> there aren't any.  My suspicion is that the 6285 is dual controller
> running in RDAC mode and you're attached to the inactive controller (in
> that configuration it allowed INQUIRY and MODE SENSE through but errors
> out on all other I/O operations).  I think you can verify by physically
> removing one of the controllers and rebooting the array (or just attach
> the SCSI cable to the other controller)

I would agree with your suspicion as the error signature is similar to
ones I receive using some FC based storage in RDAC mode. This problem is
showing up more as we have more storage support move from other multipath
solutions implemented in the mid-layer to using device mapper.

-andmike
--
Michael Anderson
andmike@us.ibm.com