Re: NIC and HBA based multipathing

[Mike Anderson <andmike@linux.vnet.ibm.com>]

Scott Moseman <scmoseman@gmail.com> wrote:
> On 11/1/07, Mike Christie <michaelc@cs.wisc.edu> wrote:
> > >
> > > I'm following the instructions on Red Hat's KB to setup the
> > > multipath.conf file.  The modprobes were successful, the service
> > > started, but...
> > >
> > > # multipath -v2
> > > error calling out /sbin/scsi_id -g -u -s /block/sda
> >
> > So are you asking about the errors from /dev/sda being accessed by
> > multipath, or are you looking for help on adding the iscsi disks to a
> > multipath device or both :)
> >
> 
> Both, I guess.  I'm following the Red Hat how-to and I'm getting that
> error instead of getting a successful output.  If there's an answer for
> why I'm getting the error, or an answer for how to fix my multipathd,
> I'm open to either one at this point.  :)
> 
> I attempted to put sda in my blacklist (per the Red Hat instructions)
> but still received the same error message about sda (the local disk).


If you trying to blacklist a device and it is still showing or when you
run multipath -v 4 the device is not listed as blacklisted then there is
most likely a problem in /etc/multipath.conf

Are you using "devnode_blacklist" as indicated in the instructions.

I believe this is incorrect and you should use something like:

blacklist {
        devnode "sda"
}

-andmike
--
Michael Anderson
andmike@linux.vnet.ibm.com