RE: Question on Tape Density, etc...

[Neil Palmer <NeilP@xxxxxxxxxxx>]

The 9427 can store 7/14GB per tape - requiring the 160 meter length 
tapes and using *FMT7GB.
Using 112m tapes the density is *FMT5GB - actually same density as 
*FMT7GB but a shorter tape.
For backwards compatibility you can use the *FMT2GB, which will store 
2.3GB (or 2.5 - depensing on who you believe) on a 112m tape (not on 
160m tapes).
You should not use *FMT2GB unless you need backwards compatibility, as 
you will cut the data transfer rate in half and increase the time 
required for backup.



Neil Palmer         DPS Data Processing Services Canada Ltd.
                                             AS/400~~~~~
Thornhill, Ontario,  Canada    ___________          ___  ~
Phone: (905) 731-9000  x238   |OOOOOOOOOO| ________  o|__||=
Cell.: (416) 565-1682  x238   |__________|_|______|_|______)
Fax:   (905) 731-9202          oo      oo   oo  oo   OOOo=o\
mailto:NeilP@DPSlink.com    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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-----Original Message-----
From:   Chuck Lewis [SMTP:CLEWIS@IQUEST.NET]
Sent:   Tuesday, September 29, 1998 10:46 AM
To:     MIDRANGE-L@midrange.com
Subject:        Question on Tape Density, etc...
Importance:     High

Hi Folks,

Back to this 9427-210, before I call IBM...


This LOOKS long but is somewhat deceiving (has lots of details for you
help <BG>)...

In my backup CLP I do a CHKTAP at the begining of the process and all 
is
fine.
The SAVLIB rolls along and completes OK.

I do another CHKTAP and get the following message:

CPF4024    Diagnostic              10    09/19/98   00:08:35   QTAERR

Message . . . . :   Volume 000016 on device TAP01 is density *FMT2GB.

Cause . . . . . :   The output volume is a different density than
specified for file QSYSTAP in QSYS. Either the existing data files, or
the labels on the volume may determine the volume density, or the tape
device may not be able to process requested density. The density of the
tape volume is used instead of the density in the tape device file.

Recovery  . . . :   If the labeled tape density is not acceptable,
prepare the tape with the correct density (INZTAP command), and then 
try
the request again.

File QSYS/QSYSTAP shows as follows:

Tape density  . . . . . . . . . . . . . . . : DENSITY    *DEVTYPE

So the questions:

1) Device TAP01 shows NOTHING related to Tape Density (????). Any idea
WHAT's going on ?

Everything works OK but I want to know if I'm missing something !


2) WHAT should this tapes be initialized as ? I'm using 
DENSITY(*FMT2GB)
using Maxell HS-8/112 Helical-Scan 8mm Data Catridges.

3) They SAY the "nominal" capacity is 2.5/5.0 Gigabytes.What is the 
9427
capable of ?

Thanks !!

Chuck


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