It looks like /dev/sdb and /dev/sdc are the two paths to the SAN volume. So you could pick one of those partition it, format it and mount it directly. However this is a bad idea since you won't have any failover support.
The next step is to get device-mapper-multipath installed and configured - see this RedHat doc (I am assuming Oracle 6 is the same as RHEL 6). I am not sure exactly what you need in /etc/multipath.conf for a Dell Compellent array. This may work:
device {
vendor "COMPELNT"
product "Compellent Vol"
path_grouping_policy multibus
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
path_selector "round-robin 0"
path_checker tur
features "0"
hardware_handler "0"
failback immediate
rr_weight uniform
no_path_retry queue
rr_min_io 1000
}
It's from http://pig.made-it.com/multipath.html.
Once you have the multipathd service started, you should be able to run multipath -ll and see both paths to the SAN. In addition, the mpath names in this output should map to entries in /dev/mapper. The mapper disks are the paths are the ones you want to format, partition, mount, etc.
FYI, you don't have to mess with all the SCSI rescan stuff. If you just echo a 1 to both of the FC host sys entries, the /dev/sdx entries will show up. Something like echo "1" > /sys/class/fc_host/host1/issue_lip will do it. Host numbers may be different on your systel. Make sure you echo to all the host ports too.
Best Answer
FC doesn't use LAG to achieve link redundancy or aggregation. It uses MultiPath IO (MPIO) to establish multiple logical communications channels and presents them to the storage subsystem as a single device.