RE: Poor IFS performance?

["Lemen, George (Contractor)" <george.lemen@xxxxxxxxxxxxxxxx>]

Patrick, Al
 From the literature I have, it looks like the 2.4GB per 3490E cartridge
assumes a 3:1 compression ratio (when "compression" is on). If there is no
compression, 800MB per cartridge is claimed.
  If the objects in the IFS do not compress well, 4 cartridges would have
somewhere between 3.2GB  and  9.6GB depending on the actual compression
results for the data being saved. 
 I'll bet this is why the tape marketing charts all say "your results may
vary significantly...."
George Lemen
Sr. Project Analyst
CIBER Inc
Weyerhaeuser CER Technical Support and Operations Manager
Weyerhaeuser phone: (253) 924-7975
Weyerhaeuser e-mail: george.lemen@weyerhaeuser.com
CIBER Phone (425) 451-2575 x142
CIBER E-mail: glemen@ciber.com

> ----------
> From:         Patrick Townsend[SMTP:townsend@patownsend.com]
> Reply To:     MIDRANGE-L@midrange.com
> Sent:         Sunday, February 27, 2000 8:48 PM
> To:   MIDRANGE-L@midrange.com
> Subject:      Re: Poor IFS performance?
> 
> Al,
> 
> Wow! It's hard to see how the AS/400 can be a reasonable Notes or Web
> server with this kind of storage problem. Thanks for your thoughts on
> this!
> 
> Patrick
> 
> "Al Barsa, Jr." wrote:
> > 
> > At 07:21 PM 02/25/2000 -0800, you wrote:
> > 
> > Well, here's what I remember, and I'm not positive that my memory is
> > absolutely correct.
> > 
> > Symptom:
> > 
> > I did a SAVE Option 21, and noted that it took 4-3490E compressed tapes
> to
> > save the IFS.  This lead me to believe that I must have had about 10 GB
> of
> > stuff in my IFS.  (2.4GB 4 = 9.6GB).
> > 
> > So I asked one of my people to find out what was in the IFS, and they
> came
> > up with 2 GB! (*NONTRIVIALDFFERENCE).
> > 
> > I reported the problem to Rochester (no, not the guy who used to wash
> Jack
> > Benney's car), and absolutely everybody started their word's to me with
> the
> > phrase "Well, there's a tender balance...".
> > 
> > So I took my 4 tapes, and did a DSPTAP (no I'm not sure which option -
> too
> > long ago).
> > 
> > DSPTAP of the IFS crap (word used deliberately) gave me sizes when I
> > requested OUTPUT(*PRINT).  I took the printout, converted it to a source
> > physical file, cleaned it up (took out garbage like headings, and other
> > subtotals that this printout provides (a feature, not a bog), and then
> used
> > Text Management/38 to do the totals, and this is where I got my findings
> from.
> > 
> > To reconcile the remainder of the difference 2GB x 2.5 is significantly
> > less than 10GB, there are two comments:
> > 
> > 1.      I saw that 4 tapes were used.  Likely they were not fully used,
> and
> > it's hard to tell how much of a tape is used for what.
> > 
> > 2.      I was told (and I fully accept this explanation) that objects in
> > the IFS compress/compact (whatever it is in that format) significantly
> less
> > well than native objects.  This does make sense.
> > 
> > >> Rest of original SNIPPED <<<
> 
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