switching boot disks with EMC attached.

From: Troy Wollenslegel (troy@intranet.org)
Date: Thu Oct 14 2004 - 00:55:59 EDT


I have 2 280R sun servers running solaris 9.
Both have a single qlogic fiber card ( Qlogic FCA Driver v0.40.5 (1
): F/W version 2.01.112) connected to a set of EMC disk.
                                                                                
The EMC is set up to show all disks (16 8 gig disks) on both systems..
When I run format I can see them on both systems..
The reason we have them visiable on both fiber cards is that aparently
with EMC it would take quite a while to "reallocate" the disks to a
fiber card with a different address (and we want to be able to mount
disks on either fiber card if we need to change disks)

The person that set up the EMC says that they are presented to both sun
systems as the same devices, eg. /dev/rdsk/c4t0d8s6 are the same disk on
the EMC.
                                                                                
I have 8 disks "allocated" to each system (prod & dev). 2 disks are
striped to give 4 16 gig stripes per system (EMC handles mirroring of
disk behind the scene) Stripes were created with Veritas (via metainit)

                                                                                
The problem is....
I would like to be able to take and move the boot disk (2 72 gig SCSI
mirrored) from the production box to the dev box in case the prod system
has issues, or the production fiber card has issues...
                                                                                
When I shut the system down, pull the boot disks, move prod to dev (or
dev to prod) and reboot, it comes up showing errors on the stripe
devices /dev/md/rdsk/d101 (for example) and wants me to fix before
booting in single user mode...
                                                                                
I continue boot process and when the system comes up I can run format
and still see all 16 EMC disks. But can't find the md devices...
                                                                                
Any thoughts, suggestions?
Should I be able to do this? (move the boot disks and still see the
correct EMC disks)?
                                                                                
Troy

-- 
Troy Wollenslegel  -  troy@intranet.org  -  http://neko.mi.org/~tawollen
"Cats are smarter than dogs. You can't get eight cats to pull a sled
through snow." - Jeff Valdez
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