The first performance tuning step should be separation of files to
relatively small and big. Direct the small ones to disk or non-shared
filepool (thus over LAN) and big files direct to tape (which can be shared
and thus lan-free). You will get the benefits of both methods. Have in
mind KEEPMP setting.

Zlatko Krastev
IT Consultant




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Subject:        Re: Why my LAN free backup even slower then my LAN backup---Was 
the
900KBps is the expected performance in this LAN free backup environment?

 Actually, I use the same Win2k host, all backup direct to tape, all no
disk pool involed, backup same files (backup whole C:\ drive, delete the
filespace before it run next time backup).
To be more precisely, my question should be "Was the 900KBps is the
expected performance in this LAN free backup environment?" Should I
continue to find out some more fine tunning method? How should I continue
the performance tuning in this environment?
Thanks for you informantion any way.
Mike
  rs6000 <rs6000 AT BTINTERNET DOT COM> wrote: Mike

It depends of what your configuration looks like and what files you are
backing up.

Think of this:

If you are backing up many small files on one SAN based machine and big
files on another machine, it goes without saying that the machine backing
up
the bigger files will have better throughput times.

LAN free versus LAN based on the other hand also has an easy explanation:

With LAN free going straight to high speed LTO tape drives the small/big
file dilemma also play a role because the LTO drive will now be
"shoeshining" when backing up small files, whereas if the client was LAN
based, the diskpool would recieve the backup before it went off to tape.
When backing up small files via LAN free there is a good possibility that
the LTO drives will not be streaming and hence the total backup thruput is
less.

Does this waffle make any sense?

Rgds
John