Hi Jason,

I don't have much info for you.  We just started running a new ADIC
Scalar 1000 with AIT2 drives at ADSM 3.1.2.50.  Level 50 is supposed to
recognize the SDX-500C drive.  There is a specific device specification
of AITC when setting up the drives with level 50.

My initial tests are showing only 55 to 70 GB utilization. The new
device support information lists the formats and capacities of the new
devices supported by the ADSM server.

Tape Drives:
|========================================================================|
| Device Name          |  Supported Formats         | Estimated Capacity |
|======================|============================|====================|
| Sony SDX-500C        | AIT, AITC                  |       50 GB        |
|                      |                            |  (see note 1,2,3)  |
|========================================================================|

Note :
    1. Compression supported
    2. Capacity
       - 25 GB typical when using 170 m tape AIT-1 cassette (SDX1-25C)
       - 35 GB typical when using 230 m tape AIT-1 cassette (SDX1-35C)
       - 36 GB typical when using 170 m tape AIT-2 cassette (SDX2-36C)
       - 50 GB typical when using 230 m tape AIT-2 cassette (SDX2-50C)
    3. Firmware level used during validation process
       SONY    SDX-500C        FW : 0102

As you know, AIT-2 with compression specified is supposed to yield
somewhere around 100 GB, so when I read the 50 GB typical when using 230
m tape -- I had hoped for better.  With level 50 installed, ADSM
command-line help mentions that you should see approximately 60 GB
utilization. I hope TSM 3.7.1 improves these numbers.

-JJ
"Alan R. White" wrote:
"Alan R. White" wrote:
>
> Hi, not done this yet but it will happen this year. There's no different
> device class for AIT2 so in theory you could just replace all your drives
> with AIT2 and run with the old AIT1 media.
>
> You will not get all the performance and capacity benefits though. According
> to a Sony engineer you will get about 4mb/s native from an AIT2 drive with
> AIT1 media as opposed to the 6mb/s with AIT2 media.
>
> If you get any more help or experiences please share with the list as this
> is something a number of folk are going to face, AIT has been quite popular
> with *SM. Likewise if we do it first I'll share it.
>
> -- Al
>
> From: Jason Howard <jason.howard AT MINDSPRING DOT COM>
> > I have an ADIC Scalar 1000 with 4 AIT1 drives.  I need to add at least 4
> > new drives.  I would like to replace my current 4 AIT1 drives for a
> > total of 8 AIT2 Drives.  What is the tape compatabilty between AIT1 and
> > AIT2?  Can I run 4 AIT 1 and 4 AIT2 drives in the same library accessing
> > the same tapes?
> >
> > What are my options, and has anybody done this before?
> >
> >
> > --
> > Jason Howard
> > Systems Adminstrator
> > Blue Cross and Blue Shield of Alabama
> > jhoward AT bcbsal DOT org
> > PHONE 205-444-6203
> > FAX 205-220-8503
> > www.bcbsal.org