Best practice for exporting the same disk to multiple guests?

I've got a T4-4 with two service domains. Each service domain has access to the same pool of SAN disks.
primary service domain has vds primary-vds0
secondary service domain has vds secondary-vds0
So far I've sucessfully built a single backend service for each SAN disk on each service domain and used the MP group operation to enable multipathing, i.e.
ldm add-vds primary-vds0_a primary
ldm add-vds secondary-vds0 secondary
ldm add-vdsdev mpgroup=target1 /dev/dsk/c0t6target1 target1@primary-vds0
ldm add-vdsdev mpgroup=target1 /dev/dsk/c0t6target1 target1@secondary-vds0
ldm add-vdisk id=0 bootdisk target1@primary-vds0 guest_a
Now, I have database datafile LUNS that I need to present to two guests at once since they're using Veritas clustering. As I understand it, what I have to present to each guest is a unique volume (volume@vds) export, and I can do it one of two ways:
Build mutiple exports of the same disk on the same vds:
ldm add-vds primary-vds0_a primary
ldm add-vds secondary-vds0 secondary
ldm add-vdsdev mpgroup=db1a /dev/dsk/c0c6target5 db1_server_a@primary-vds0
ldm add-vdsdev mpgroup=db1a /dev/dsk/c0c6target5 db1_server_a@secondary-vds0
ldm add-vdsdev mpgroup=db1b /dev/dsk/c0c6target5 db1_server_b@primary-vds0
ldm add-vdsdev mpgroup=db1b /dev/dsk/c0c6target5 db1_server_b@secondary-vds0
ldm add-vdisk id=6 database_disk db1_server_a@primary-vds0 guest_a
ldm add-vdisk id=6 database_disk db1_server_b@primary-vds0 guest_b
Build a separate vds for each guest domain, and then add the vdsdevs to each vds:
ldm add-vds primary-vds-server_a primary
ldm add-vds primary-vds-server_b primary
ldm add-vds secondary-vds-server_a secondary
ldm add-vds secondary-vds-server_b secondary
ldm add-vdsdev mpgroup=db1a /dev/dsk/c0c6target5 db_disk@primary-vds-server_a
ldm add-vdsdev mpgroup=db1a /dev/dsk/c0c6target5 db_disk@secondary-vds-server_a
ldm add-vdsdev mpgroup=db1b /dev/dsk/c0c6target5 db_disk@primary-vds-server_b
ldm add-vdsdev mpgroup=db1b /dev/dsk/c0c6target5 db_disk@secondary-vds-server_b
ldm add-vdisk id=6 database_disk db_disk@primary-vds-server_a guest_a
ldm add-vdisk id=6 database_disk db_disk@primary-vds-server_b guest_b
The end result is the same, but is there any advantage (performance, configuration management, whatever) to doing it one way versus the other?
Thanks!
Tim Metzinger

the standards for videoDVD are 720x480, and usually mpeg2 encoded..
so, your HiDef project HAS to be 'downsampled' somehow..
I would Export with Qucktime/apple intermediate => which is the 'format' your project is allready, and you avoid any useless 'inbetween encoding'..
iDVD will 'swallow' this huge export file - don't mind: iDVD cares for length, not size.
iDVD will then convert into DVD-standards..
you can 'raise' quality, by using projects <60min - this sets iDVD automatically to highest technical possible bitrate
hint: judge pic quality on a DVDplayer + TV.. not on your computer (DVDs are meant for TVdelivery)

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Message was edited by:
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