We investigated the mixed technology as well and determined that the
issues you are seeing were not worth it. The only way we could see
around it would be to zone out the drives by gateway, insuring only
certain drives get used. Then the media would have to be in specific
pools because once the 320's use them the 220's no longer can.
-----Original Message-----
From: Darragh, Stephen J [mailto:stephen.j.darragh AT baesystems DOT com]
Sent: Tuesday, October 14, 2003 6:05 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Mixed SDLT320 and SDLT220 in the same robot.
Hi,
In mixing 320 and 220 media, I believe we have a problem I would term
show stopper.
We are going to have each robot at each campus with the following
configuration.
ERP storage at site A will use 4 each SDLT320 drives and a storage unit
defined for just ERP NAS storage at each site will use 1 or more SDLT320
drives, these will be direct attached to its filer. All other storage at
each site will use SDLT220 drives
Veritas by default will assign a sdlt320 drive as using media type dlt2
Veritas by default will assign a sdlt220 drive as using media type dlt3
(This seems reveresed to me, but I have verified this is truw)
All robots get tapes from the Scratch pool which is currently defined as
using media type dlt3
Because we use the scratch pool, it seems we will have to have special
bar code rules for both ERP and NAS tapes? The ERP can be done, since
there is only one volume pool called ERP_Full (we only do full backups
of ERP data on a daily basis) For NAS however, we use two volume pools
NDMP_Full and NDMP_Incr. We would have to have the operators manually
move tapes into these pools so there were always unused tapes available
(not feasable)
If we just have every drive, be of type dlt3 media type, then at least
at nhq, we will not know which drives get used, since you can't force a
particular drive to be used by a specific storage unit. I don't even
know if this would work since the drives are not the same
It would have been sooooooo much easier for use to stay with SDLT220
drives, and add more drives instead of going to newer technologies.
I need either a better solution, or to put all our new sdlt320 drives in
the one NHQ robot, which was not the intended use of these more
expensive drives.
Thanks in advance fo rany suggestions
Stephen Darragh
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