--> I was told that Veritas does this. What would be the benefit of doing
things this way?
Teach yourself to avoid the marketing scrap without being bullied. This
"functionality" is useful in only one case - when your backup clients (or
their network connectivity) are heavily bottlenecked and tape drive
outperforms them.
I would hardly accept that your R/3 server is a box which is unable to
read from disks faster than a single tape drive!
Example 1: your nodes A, B, C are able to drive their backup streams up to
5 MB/s and the drive is capable of 15 MB/s. By multiplexing these slow
clients you would be able to stream the tape drive at full speed.
Example 2: your nodes A, B, C are able to stream at 20 MB/s (20+20+20=60
MB/s) but you multiplex them again. As result the backup data on tape will
look like "ABCACCBAA..." and your restore of client A will be "read, skip,
skip, read, skip, skip, skip, read, read, ..."
Example 3: Your single node A is splitting data in 3 streams A1, A2, A3
which in turn got multiplexed. The result might be again something like
"A1A2A3A1A3A3A2A1A1".
But what if your restore becomes "read A1, skip, skip, read A1, skip,
skip, skip, read A1, read A1, rewind, skip, read A2, skip, skip, skip,
skip, read A2, ..."?!?
Zlatko Krastev
IT Consultant
"Gill, Geoffrey L." <[EMAIL PROTECTED]>
Sent by: "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]>
21.11.2003 16:52
Please respond to "ADSM: Dist Stor Manager"
To: [EMAIL PROTECTED]
cc:
Subject: SAP R/3
Can those of familiar with the SAP R/3 TDP please answer a question? I
know
that by running multiple sessions we can direct those same sessions each
to
a tape drive. Can the R3 TDP be configured to send multiple sessions to a
single tape drive simultaneously? I was told that Veritas does this. What
would be the benefit of doing things this way?
I was also wondering if someone would be willing to contact me, or I
contact
you, regarding the design of a TSM system that would basically be doing
these same TDP R/3 backups and nothing else. I'm looking for other
opinions
to help in designing this system given the requirements I've been sent. If
you would like to call me my number is below. If you would like me to call
you, you can email me directly, I would be will to do that also.
Thanks for the help,
Geoff Gill
TSM Administrator
NT Systems Support Engineer
SAIC
E-Mail: [EMAIL PROTECTED]
Phone: (858) 826-4062
Pager: (877) 905-7154
