When backing up or restoring to SSA disk, I usually get about a 30 second
response time before data moves (LTO 3584 library & 500GB SSA disk on TSM
server).  Once it starts moving, I get almost a Gig a minute per tape drive
(5 drives).

Thank you,

Jeff Caffey
Enterprise Systems Programmer
Pier 1 imports, Inc.  -  Information Services
jlcaffey AT pier1 DOT com
Voice: (817) 252-6222
Fax:   (817) 252-7299

 -----Original Message-----
From:   Ray Pratts [mailto:rpratts AT SWBELL DOT NET]
Sent:   Thursday, February 01, 2001 8:55 PM
To:     ADSM-L AT VM.MARIST DOT EDU
Subject:        Re: LTO PERFORMANCE with TSM

I've seen these LTO test results

TSM backup/restore operations with a large (256 MB) file size of data that
does not
benefit from compression (e.g. video, audio, and image files)

    Backup 12.8 MBs / second
    Restore 14.7 MBs / second

Backup/restore operations with large files which benefit from compression

    Backup 15.3 MBs / second
    Restore 17.0 MBs / second


Dan Giles wrote:

> I've seen a lot of things about LTO in this group (mostly good), but I
haven't
> seen anything that directly relates to performance with TSM. To date,
Magstars
> were THE best technology for TSM (in my opinion) due to the fact that it
didn't
> have to back-hitch. I suspect that because LTO uses servo tracking, that
this
> may be the case with LTO as well.
>
> Also, looking through the red book, I see that the average search time to
first
> byte of data isn't any better than DLTs. With DLTs, I found 1 1/2 minutes
wait
> time to start data transfer was a bit ridiculous, especially when
collocating a
> large number of servers.
>
> Any comments on this?
>
> --
> Dan Giles, Tivoli Certified Consultant - TSM 3.7
> phone: (416) 402-9744
> e-mail: dangiles AT sympatico DOT ca