This is the overdue summary Regarding ddr.dbase entries for HP 35480A, HP
C1533A, Connor/Seagate Archive Python dat drives. Thanks to Thomas
Leitner <tom_at_finwds01.tu-graz.ac.at> for his help. I was correct in not
NEEDing one, but also right in my suspicions that it is what gave me
software switching for data compression - at least for the HP that has it.
Thomas sent a ddr.dbase entry for the C1533A and suggested that it could
be similar for other HP dats with software switching for data compression.
My question, his answer, and the ddr.dbase entry are below.
Thanks!
Claudia Burg
*********************************************************
* Message From: *
* Claudia-Angelica Teresa Chiarenza Burg *
* aka Gigi *
* Claudia *
* G^2 *
* Currently Computing From: Arizona State University *
* Working on: a PhD in Physics and Astronomy *
* Claudia.Burg_at_asu.edu *
*********************************************************
On Sun, 22 Mar 1998, Claudia A T C Burg wrote:
> I am trying to figure out if our ddr.dbase needs entries for three dat
> drives, and what they should be if needed. the drives are:
>
> HP 35480A -alpha 3000
> HP C1533A -alpha 200 4/166
> Connor/Seagate Archive Python -alpha 200 4/166
> all machines are running DU 4.0b with no patches.
>
> I originally thought I needed the entries when the HP 35480A was not
> backing up as much as I was told it would. That has since been
> determined to be an error in the information I was given. I was originally
> told it held up to 8GB compressed and not the 4GB that it says on the HP
> web page. A search of the archives had indicated that at least one
> person added an entry for the HP C1533A but the entry was not given.
>
> Any advice would be appreciated.
[...]
Basically you don't *NEED* an ddr.dbase Entry for any of these tape
drives. You only need one if you want to control certain parameters
of the drive by selecting different device names. Most of the time
people use this for turning hardware compression on/off by using
/dev/rmt0h for hardware-compression turned on and /dev/rmt0l for
hardware-compression turned off.
I have a ddr.dbase entry for a C1533 which I'm attaching to this
email. As far as I know, the 35480 does not have hardware-compression
so you don't need a ddr.dbase entry at all. If I'm wrong here you
could just try the ddr.dbase entry of the C1533 as I think that the
method for toggling hardware-compression is not different between
these models.
Hope this helps -- Tom
----------ddr.dbase entry for C1533A ------------------------------
SCSIDEVICE
#
Type = tape
Name = "HP " "C1533A"
#
PARAMETERS:
MaxTransferSize = 0xffffff
DisperseQueue = false
TagQueueDepth = 0x0
ReadyTimeSeconds = 0x2d
InquiryLength = 0x2b
DENSITY:
DensityNumber = 0
OneFilemarkOnClose = no
DensityCode = 0x13
Blocking = 0
CompressionCode = 0x0
Buffered = 0x1
DENSITY:
DensityNumber = 1
OneFilemarkOnClose = no
DensityCode = 0x13
Blocking = 0
CompressionCode = 0x1
Buffered = 0x1
DENSITY:
DensityNumber = 2
OneFilemarkOnClose = no
DensityCode = 0x13
Blocking = 0
CompressionCode = 0x1
Buffered = 0x1
DENSITY:
DensityNumber = 3
OneFilemarkOnClose = no
DensityCode = 0x13
Blocking = 0
CompressionCode = 0x0
Buffered = 0x1
DENSITY:
DensityNumber = 4
OneFilemarkOnClose = no
DensityCode = 0x13
Blocking = 0
CompressionCode = 0x0
Buffered = 0x1
DENSITY:
DensityNumber = 5
OneFilemarkOnClose = no
DensityCode = 0x13
Blocking = 0
CompressionCode = 0x0
Buffered = 0x1
DENSITY:
DensityNumber = 6
OneFilemarkOnClose = no
DensityCode = 0x13
Blocking = 0
CompressionCode = 0x0
Buffered = 0x1
DENSITY:
DensityNumber = 7
OneFilemarkOnClose = no
DensityCode = 0x13
Blocking = 0
CompressionCode = 0x0
Buffered = 0x1
#
# end of entry
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T o m L e i t n e r Dept. of Communications
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Received on Thu Apr 09 1998 - 01:36:58 NZST