[dm-devel] NIC and HBA based multipathing

[Scott Moseman]

On Nov 12, 2007 2:18 PM, Mike Anderson <andmike at linux.vnet.ibm.com> wrote:
> >
> > 30690a018f015191a6472441d1500f057  1:0:1:0 sdb 8:16  [active][ready] EQLOGIC /
> >   3:0:0:0 sdc 8:32  [faulty] EQLOGIC /100E-00         /2.3
> >
>
> Based on the previous multipath -v4 output you provided (snippet shown
> below) it appears there is a problem accessing the device node of sdc as
> it complete sysfs_pathinfo and then appears to fail when it tries to open
> the device node.
> ...
> h:b:t:l = 3:0:0:0
> tgt_node_name =
>
> Is /dev/sdc ok? Can you do a dd read of the device?
>

Interestingly enough, I have a usable sdc1, but there's no sdc...

# dd if=/dev/sdc
dd: opening `/dev/sdc': No such file or directory

# ls -l /dev/sd* | grep -v sda
brw-------  1 root root 8, 16 Nov  7 14:43 /dev/sdb
brw-rw----  1 root disk 8, 17 Nov  7 14:43 /dev/sdb1
brw-rw----  1 root disk 8, 33 Nov  7 14:45 /dev/sdc1

I can actually mount /dev/sdc1 and it's the partition on the SAN.  But
I cannot dd or fdisk /dev/sdc itself.

This is a first time I've seen this kind of disk behavior before!

Thanks,
Scott