Hi,
OK.. there is a way to ensure that the disks you will be adding will have the same target and LUN number.
On the host where EMC control center software is loaded
1) Find out the channel directors your host is attached to
2) execute this command to find out the free vbus, lun and target that can be used to map the new EMC devices to the host
# symcfg list -SA 5B -address -available
# symcfg list -SA 6B -address -available
Here I assume your host is attached to the EMC channel directors 5B & 6B.
From the output of the above commands, pick the vbus,lun and target combination that are available in both the channel directors.
3) Now, to assign the EMC devs to the host you need to create a mapping config that will be used by symconfiure command
# vi /tmp/host.map
map dev 469 to dir 5B:0 target=8, LUN=2, vbus=3;
map dev 469 to dir 6B:0 target=8, LUN=2, vbus=3;
map dev 47A to dir 5B:0 target=0, LUN=3, vbus=4;
map dev 47A to dir 5B:0 target=0, LUN=3, vbus=4;
#
4) Preview and apply the configuration
# symconfigure -f /tmp/host.map preview
# symconfigure -f /tmp/host.map commit
5) Execute ioscan and insf from the host and you are done.
Now u should see the primary and alternate link have the same target and lun number but a different controller number, for obvious reasons :-)
hope this helps
-- Sundar.
Learn What to do ,How to do and more importantly When to do ?
