William and Stephen,
DLT, DLT2, and DLT3 is a method that allows you to have different types of
DLT drives and media in the library. It really doesn't matter which number
gets assigned. However, if the SDLT320 is DLT2 drive, then you must also
assign media in the library as DLT2. This would mean that all DLT2 media
would be used soley on DLT2 drives. Similarly, DLT3 media would only be
usable on DLT3 drives. Therefore, if you add media using these designators
(either by barcode rules or manually) you will ALWAYS know which tapes are
used in which drives.
Steve Dvorak
-----Original Message-----
From: Toelken, William [mailto:ToelkenW AT aetna DOT com]
Sent: Thursday, October 16, 2003 4:24 AM
To: Darragh, Stephen J; veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] Mixed SDLT320 and SDLT220 in the same robot.
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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