On Nov 23, 2005, at 4:44 PM, Manel Rodero wrote:
Hello,
I would like to know if is it possible to use two or more simultaneous
devices (tapes) to backup different savesets from a same machine.
I ask this because I have a "problem" in this environment:
- 1 Server:
Windows 2000 7.1.2.Build.325
- 5 Clients:
AixOS 7.1.2.Build.325
2 x Solaris 7.1.2.Build.325
Linux 7.1.2.Build.325
Windows 2000 7.1.2.Build.325
The server has 3 SDLT320 drives, Server parallelism = 15, Target
sessions
per tape = 5, Client parallelism = 4 and Priority = 500 for all five
clients.
You would be better served by adding additional tape drives to your
data zone, but with what you are working with now, you might see
better backup performance by increasing target sessions on those
three tape drives to 7 and increasing server parallelism to 21. The
down side to this is that if you need to do a recover, it will take
longer.
You have to find a balance between acceptable times for backups and
acceptable times for recovers, esp. save set recovers. As you
increase target sessions, you increase the amount of interleaving or
multiplexing on your tapes, which slows down recovers.
This is why I suspect what you need is another tape drive ... or a
wider backup window. Ideally, you want to leave the target sessions
at 4, which is the default, but your requirements preclude that with
your current hardware. Another option, which may or may not be
possible in your environment is to get the data to those three tape
drives faster, possibly by using a faster network.
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