Hi Sascha

Are the drives connected on the same adapter? In this case, the 
"shoe-shine" effect is probably what you're seeing. Your new LTO-2 drive 
have variable speed. However, the speed is only adjustable as long as the 
speed doesnt fall below 15MB/s. Your LTO-1 drives has a maximum transfer 
rate of 15MB/s uncompressed. This could mean, the LTO-1 drives doesnt 
deliver data fast enough to the LTO-2 drives.

If you're using SCSI connected drives, this could impose a real impact on 
performance, as the SCSI adapter is arbitrated, and therefore cannot write 
to more than one device at a time.

If you're using AIX, you could use for example topas(if its installed) so 
see the performance of your tape drives. As long as no other procesess or 
sessions are running, you could look at the top right number(tty 
write/read) to determine the speed of the tape drives.

Best Regards

Daniel Sparrman
-----------------------------------
Daniel Sparrman
Exist i Stockholm AB
Propellervägen 6B
183 62 TÄBY
Växel: 08 - 754 98 00
Mobil: 070 - 399 27 51



Sascha Askani <se7en_t_2 AT GMX DOT NET> 
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
2004-07-05 13:46
Please respond to
"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>


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Subject
Re: 3582 supported on TSM 5.2.2 AIX ?






Hi Daniel,

thanks for your fast reply, I feel somewhat relieved that the lib is
supported, because I face major performance problems with this library at
the moment doing a "move nodedata" 3583(LTO1) -> 3582(LTO2), but I can't 
say
if this is a Library-, SCSI- or TSM-Problem or no problem at all (for
example "Shoe-shine" on the 3583...

Greetings

Sascha Askani

> Hi Sascha
>
> It means from, so you shouldnt have any problems using your 3582 under 
TSM
> 5.2.2.2. The only tape libraries from IBM that has gone out of support 
is
> the 3575-series of libraries.
>
> Notice that you will have to download and install the IBM Atape device
> driver, which you can download from
> ftp://ftp.software.ibm.com/storage/devdrvr/AIX.
>
> Best Regards
>
> Daniel Sparrman


>
> Sascha Askani <se7en_t_2 AT GMX DOT NET>
> Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
> 2004-07-05 13:18
> Please respond to
> "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
>
>
> To
> ADSM-L AT VM.MARIST DOT EDU
> cc
>
> Subject
> 3582 supported on TSM 5.2.2 AIX ?
>
>
>
>
>
>
> Hi List !
>
> I just wanted to assure that the IBM 3582 (SCSI)-Library is supported
> under
> TSM 5.2.2 (AIX) because "Supported Devices" on IBM-Website tells me:
>
> IBM 3582 Ultrium Scalable                AIX      HPUX    SUN      WIN
> The IBM device driver is required.
> 2 Drives 24 Slots                      5.1.6.5  5.1.6.5 5.1.6.5 5.1.6.5
>
> Does this mean that said library is ONLY supported under 5.1.6.5 or is 
it
> supported FROM 5.1.6.5 ON ?
>
> Thanks for your support !
>
> Sascha Askani
>