[dm-devel] NIC and HBA based multipathing
Mike Christie
michaelc at cs.wisc.edu
Thu Nov 1 19:53:09 UTC 2007
Scott Moseman wrote:
> Thanks for the follow-up. I have each initiator setup with access to
> the SAN. The NIC is accessing /dev/sdb and the HBA is accessing
> /dev/sdc. I can mount either (or both) and access the data on the SAN
> volume.
Yeah, the iscsi bits looks fine. You will have a /dev/sdX for the nic
and one of the HBA.
When you start multipath, multipath should then create one multipath
device from those two scsi ones.
>
> # rpm -qa | grep multipath
> device-mapper-multipath-0.4.5-16.1.RHEL4
>
> # /etc/init.d/multipathd status
> multipathd (pid 15929) is running...
>
> 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
>
> ...with /dev/sda being my physical hard drive. dmesg output says:
>
> device-mapper: dm-multipath: error getting device
> device-mapper: error adding target to table
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 :)
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