I have a Win2003 server, NW 7.4 SP1, using an HP SDLT autoloader. Total 
size of backup is about 600G (589G, according to mminfo). We'd like to do 
a full backup every day. However, I seem to be averaging 4 tapes (3 full 
tapes, and 25% used on the last) every day. Now, an SDLT tape is 160G 
native, up to 320G compressed, so 600G would need 4 tapes native (3 and 
3/4 or so, according to the math).

IOW, it doesn't appear as if compression is being used, or just barely 
used. I see nowhere in NW how to turn on hardware compression on the 
autochanger. Am I just missing it?

I did change to using the "NT with compression" directive, which didn't 
seem to affect the output; I am still getting 3.25 tapes per day used. 

My question: I am backing up 3 servers, 2 of which were set to use the 
compression directive, and 1 was not (this last server is very small, and 
doesn't significantly add to the total). Do all group members need to use 
the same compression directive, else NW won't compress? It shouldn't be a 
problem to make all 3 servers use the compression directive, but I thought 
I could use it only on the server that needs it (one server accounts for 
about 570G of the 590G total).

Thanks

-- 
Michael Leone
Network Administrator, ISM
Philadelphia Housing Authority
2500 Jackson St
Philadelphia, PA 19145
Tel:  215-684-4180
Cell: 215-252-0143
<mailto:michael.leone AT pha.phila DOT gov>

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