We have a 3584 with LTO-2 drives and a single device class with FORMAT=DRIVE. I 
mix LTO1 and LTO2 media in the library with no
problems. IF you do a Q LIBV F=D you can see the media type off to the right. 
When TSM mounts and LTO1 tape you see the default
estcap for that type of tape. And the same for LTO2 tapes.

I even have a 3583 with mixed LTO1 drives and a single LTO3 drive. Now that 
system I have 2 devclasses with FORMAT=ULTRIUMC and
ULTRIUM3C and different storage pools. Since LTO1 is only read compatible with 
LTO3 drives. I had my devclasses set to FORMAT=DRIVE
over a weekend and got some really strange storage pool volume assignments. 
Won't do that again! Everything worked, but I got LTO1
tapes in my stgpool that I thought would still be LTO3 tapes.


Bill Boyer
"Some days you're the bug, some days you're the windshield" - ??

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Rushforth, Tim
Sent: Wednesday, August 31, 2005 4:38 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Mixed media (LTO1 and LTO2) with LTO2 Drives - small correction

I was thinking that the first option you described is what I would like to do 
but that seems to contradict the admin guide statement
below:
(cannot mix media in one stgpool)?

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Otto Schakenbos
Sent: Wednesday, August 31, 2005 3:10 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Mixed media (LTO1 and LTO2) with LTO2 Drives - small correction

I think you have to create a deviceCLASS called LTO (or something) and set the 
recording format to drive.
Then when tsm mounts a tape the drive will recognize what kind of tape
(lto1 or lto2) and use the correct format. If you want compression you will 
need to turn that on on the drive it self, this would be
done with tapeutil I pressume.

This would be the only way to use mixed media in the scratch pool.

If you want to separate the different media to different storagepools you need 
to create two device classes (lto1 and lto2) and use
the define vol  command to assign the volumes to the storage pools as you like 
it.

regards

Rushforth, Tim wrote:

>Hi:
>
>
>
>We are looking at upgrading one of our 3584 libraries to all LTO2
drives
>(we currently have a mix of LTO1 and LTO2 drives) and use a mixture of
>LTO1 and LTO2 media (we currently only use LTO1 media).
>
>
>
>The admin guide states:
>
>
>
>Mixed Media and Storage Pools:
>
>You cannot mix media formats in a storage pool. This includes LTO1 and
>LTO2 formats. Each unique media format must be mapped to a separate
>storage pool through its own device class.
>
>
>
>We want to continue using LTO1 media (reading and writing) and also use
>LTO2 media (using the full capacity) - all with LTO2 drives.
>
>
>
>So I think one way of doing this is to setup a device class specifying
>ULTRIUMC and another with ULTRIUM2C and then point stgpools with the
>appropriate device class.
>
>
>
>If this is done, can scratch tapes be used for both stgpools?
>
>Will TSM just use LTO1 media for the ULTRIUMC stgpool and only use LTO2
>media with the ULTRIUM2C stgpool?
>
>If there were no LTO1 media, would TSM use LTO2 media for the ULTRIUMC
>stgpool (writing in LTO1 format)?
>
>
>
>Thanks,
>
>
>
>Tim Rushforth
>
>City of Winnipeg
>
>
>
>
>
>


--
Otto Schakenbos
System Administrator

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