Have in mind that in such scenario the 3592 writing speed cannot be higher
than reading rate of 3590 drives.
For better performance you can define separate copypool over devclass of
3592 and read/write at higher speed. You can do this at least for onsite
copypools if your library at DR site is having only 3590 drives.
Copy between 3592 drives can be at 3x40 MB/s = 432 GB/hour (3 drives
reading, 3 writing), while copy from 3592 to 3590 is limited to 6x 14 MB/s
= 302,4 GB/hour (6 drives 3592 reading, 6 writing + 2 idle 3590). Even if
you add 2 more 3592 drives later you can reach 8x 14MB/s = 403,2 GB/hour
(but it that case you can have 4x 40 MB/s = 576 GB/hour).

Bottom line: put your priority systems into 3494 with Jaguar drives and
leave the less important in 3494/3590.

Zlatko Krastev
IT Consultant






Mike Cantrell <Mike_Cantrell AT SAKSINC DOT COM>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
10.11.2003 17:02
Please respond to "ADSM: Dist Stor Manager"


        To:     ADSM-L AT VM.MARIST DOT EDU
        cc:
        Subject:        TSM and multiple libraries


Hello
I have a question concerning using a single TSM Server and two libraries.
1. Single TSM Server
2. first 3494 with 8 3500E drives
3. second 3494 with 6 of the new jaguar drives
4 TSM Server will see both 3494's
5. first 3494 will be used for backups
6 second 3494 will be used to do duplexing only
Can we actually backup to one 3494 and then duplex to another 3494
library.
I do not believe we can assign a copypool a particular tape range. Since
the
command "ba stg jxn_tapepool copypool02" will backup the tapepool to a
copypool how can you tell TSM what library to use??


Thanks
Mike