Re: 6390 data capacity

[Neil Palmer <neilp@xxxxxxxxxxx>]

Assuming an older 7208-002 is capable of using the thinner 160m tape 
without jamming or wrapping it around the head drum, it would get about 
3.5GB (uncompressed) on the tape.  Newer drives can use *FMT7GB (which is 
the same format as *FMT5GB but on a longer tape).

The chart you refer to in the handbook is incorrect (I had already 
notified IBM). 
As you noticed, the 6390 info is duplicated from the 4587 QIC drive above.

It's best to use both DTACPR(*DEV) COMPACT(*DEV) to get the most data onto 
the tape.

...Neil





D.BALE@handleman.com
Sent by: owner-midrange-l@midrange.com
2001/05/22 16:17
Please respond to MIDRANGE-L

 
        To:     MIDRANGE-L@midrange.com
        cc: 
        Subject:        Re: 6390 data capacity


Dave, Tony, & Neil,

Thanks for the replies.
I guess I'm stuck mentally (watch those snide remarks!) when I look at the
Maxell HS-8/160 data cartridge sitting in front of me and right under the
"HELICAL-SCAN 8mm DATA CARTRIDGE" reads the following:

   160M/525FT. NOMINAL CAPACITY: 3.5/7.0 GIGABYTES

Does this mean that the nominal (uncompressed) capacity is *either* 3.5GB 
*or*
7.0GB, depending on the tape drive?  And that, for all 8mm tape drives 
that
can be used on an AS/400, they always format at 7GB and never at 3.5GB?

And, whatever *FMTnGB is used to initialize, is it interpreted as nominal 
/
uncompressed?

Interesting note in the iSeries handbook you pointed me to, Neil.  If you 
look
on book page 324 (or PDF page 354), you'll see the 6390 at the bottom of 
the
page.  It shows a maximum compressed capacity of 100 GB or 50GB, depending 
on
the format.  Probably a typo since it's the same data for the 50GB QIC 
shown
just prior.

Anyway, I did see the reference later in the handbook (Referenced Lists,
Removeable Media Devices) that shows that the maximum compressed capacity 
for
the 6390 is 14GB.

So having answered that question, I have another:  Does anyone use
DTACPR(*YES) and COMPACT(*DEV) together?  In my past experience, I have 
relied
on going with the defaults in which software DaTA ComPRession is not used 
when
the hardware COMPACTion is available.

- Dan
Dan Bale says "BAN DALE!"
IT - AS/400
Handleman Company
248-362-4400  Ext. 4952
D.Bale@Handleman.com
  Quiquid latine dictum sit altum viditur.
  (Whatever is said in Latin seems profound.)

-------------------------- Original Message --------------------------
Dan,

There are several 8mm tape densities.  The lowest density, which was used 
by
the 7208 model 2 (if I'm remembering correctly) would be 3.5GB 
uncompressed
and 7GB compressed on 160m tapes, although I had always thought that those
older drives wouldn't handle tapes longer than 112m.  The next higher (and
most common) density would be the 7GB/14GB capacity, using the newer 
drives
like the 7208 model 12 and the 6390.  If your tapes say 3.5/7 then I would
suspect that they might be cheap tapes that aren't rated for the higher
density.  Do they work okay?  When you do a DSPTAP, what's the value shown
for density?

Dave Shaw
Simpsonville, SC
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----- Original Message -----
From: <D.BALE@handleman.com>


> I've got someone telling me that the 6390 on their box is capable of
storing
> 7GB uncompressed, 14GB compressed on a single 8mm 160m cartridge.  I 
find
that
> interesting since the cartridges I look at clearly state that they are
3.5GB
> uncompressed, 7GB compressed.
>
> Can anybody using a 6390 fill me in on this?  FWIW, it's running on a 
V4R4
> 9404-400.
>
> Oh, and where would I find this kind of information on IBM's web site?
>
> TIA.
>
> - Dan
> Dan Bale says "BAN DALE!"
> IT - AS/400
> Handleman Company
> 248-362-4400  Ext. 4952
> D.Bale@Handleman.com
>   Quiquid latine dictum sit altum viditur.
>   (Whatever is said in Latin seems profound.)


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