Thanks for your replies Wes and Tom.  What kind of clients are you
backing up?  We are about 90% netware and 10% NT.  I migrated 16 gigs of
data from disk to tape to come up with the 1.25:1 number.  I ended up
with 1 tape @ 8 gigs, 1 tape @ 6 gigs, 1 tape @ 5 gigs 25% full.  I
queried the 8 gig tape and all the files were from a netware server.
 Things like directories, .docs, .xls and such and they were uncompressed
when they got to the tape drives.  I'd think that we represent a large
section of the typical customer base for the 3570 drives and if it's a
matter of files that are not eligible for compression, then I'd like to
know what file types IBM used to come up with 3:1 compression.  Shaun

 -----Original Message-----
From: Wes Lewison
Sent: Monday, June 21, 1999 1:27 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: 3570 Compression

Hmmmm, We have 2 Magstar L32's with 4 drives each and on average get
about
8-11 per tape, with as high as 33gig on one tape (wow).
ADSM v3.1.2.13
Server is running WinNT 4.0 sp3.

We don't use client compression at all.  Rely entirely on the drives for
compression.

 -Wes

 -----Original Message-----
From: Spruiell, Shaun [mailto:SSpruiel AT PHS DOT ORG]
Sent: Monday, June 21, 1999 2:58 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: 3570 Compression


While we're on the subject of Magstar and compression, has anyone gotten


to 3:1 on 3570?  We have 6 3570B drives and we were not getting any
compression at all on any.  Set devclass to 3570C, updated atape driver,


and patched up all device drivers (we're running AIX 4.2) and now we get


about 1.25:1 at best.  The files are netware uncompressed, mostly text
files, some .doc, .xls.  What gives?  Shaun Spruiell, Presbyterian
Healthcare Services