Linux-Hardware Digest #381, Volume #13 Tue, 8 Aug 00 18:13:07 EDT
Contents:
Re: dump and hardware compression (Joshua Baker-LePain)
Re: SCSI HP Scanner: Sane works, XSane doesn't (Guy Maskall)
Re: SCSI HP Scanner: Sane works, XSane doesn't ("Tito")
Re: Why is my harddisk so slow? (emiel)
idebus speed (emiel)
Re: Need Ideas For An ISA NIC (Craig McCluskey)
Re: Printing to an HP4050N (Craig McCluskey)
Re: USB scanner for Linux? (Wolfgang Fritz)
Re: "Turbo" and X-windows. (Internet Support Pete)
Re: USB printer for Linux? (Internet Support Pete)
HP DDS2 and DDS3 backward compatibility ("Stefan Viljoen")
Undesired video behavior ("wm")
Re: Why is my harddisk so slow? (Dances With Crows)
----------------------------------------------------------------------------
From: Joshua Baker-LePain <[EMAIL PROTECTED]>
Crossposted-To: comp.os.linux.misc
Subject: Re: dump and hardware compression
Date: 8 Aug 2000 19:15:57 GMT
In comp.os.linux.hardware [EMAIL PROTECTED] wrote:
> Hi all,
> Can anyone tell me whether the Dump command supports
> the hardware compression on my HP C1554A Dat tape drive?
> I don't think I'm getting anywhere near the 24gb that I
> should be able to get onto these DDS3 tapes. Any info
> would be greatly appreciated! RH Linux6.2
*sigh* RTFM. But, let me spell some stuff out
1) the dump command does not handle compression. The state of the
tape drive is controlled by the 'mt' command. For example:
mt -f /dev/nst0 status
gets the status of the drive. In there will be the density code -- 0x25
is the correct code for DDS3. If that current status does not show that,
you can set the density by:
mt -f /dev/nst0 setdensity 0x25
This *is* explained in the mt man page, which is what I pointed you at
before. This info is also available via a quick (took me 5 minutes) search
on www.deja.com.
2) 24GB is an *estimate*, and an optimistic one at that. Your tapes have a
native capacity of 12GB, and the 24GB number is based on 2:1 compression.
If you are backing up a lot of already compressed or binary files,
you're not going to get anywhere near 2:1 compression.
3) What makes you think you're not getting enough capacity? Are the backups
hitting eot before you expect them to? Or are the estimates off? If it's
the estimates, what dump command are you using? Some of those paramerters
tell dump how big of a tape to expect, and it bases the estimates in those.
4) dump as shipped with RH6.2 is buggy. Download the latest version (0.4b18)
from:
http://dump.sourceforge.net/
This includes a -a option which tells dump to write until it hits eot,
omitting tape length estimates. You'll have to read the man page to
see what other options are available.
--
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University
------------------------------
From: Guy Maskall <[EMAIL PROTECTED]>
Subject: Re: SCSI HP Scanner: Sane works, XSane doesn't
Date: Tue, 08 Aug 2000 20:32:15 +0100
I may have misread your original post.
What can you actually do and can't do? What hardware and kernel do you
have?
You should have a /home/<name>/.sane directory, does deleting it help?
Guy
------------------------------
From: "Tito" <[EMAIL PROTECTED]>
Subject: Re: SCSI HP Scanner: Sane works, XSane doesn't
Date: Tue, 8 Aug 2000 15:39:57 -0400
Thanks for your help,
I am using RedHat 6.2, so I guess it's one of the latest kernel versions.
I'm using an HP Scanner on an Advansys card which is being recognized by the
kernel, and, xscanimage works fine. XSane is another frontend to sane. I
tried deleting .sane but that didn't work. Someone told me I should debug
it and run some export commands but I don't really know how to do this.
-Tito
"Guy Maskall" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]...
> I may have misread your original post.
> What can you actually do and can't do? What hardware and kernel do you
> have?
>
> You should have a /home/<name>/.sane directory, does deleting it help?
>
> Guy
>
------------------------------
From: emiel <[EMAIL PROTECTED]>
Subject: Re: Why is my harddisk so slow?
Date: Tue, 08 Aug 2000 21:43:15 +0200
> IDE has always been somewhat slower. And the smaller the density, the
> slower the average. 3 GB versus 20 GB on the same access time would
> probably give dramatically better results...cluster size is important.
> But if you want something really fast, get the ultra 160 with a 64 bit
> PCI...it exceeds expectations, and the drives themselves aren't that
> much different in price from older scsi technology (yes, this far
> exceeds the price of IDE, it also vastly outperforms it).
>
But shouldn't udma/66 give a throughput of 66 MB/s (in theory) ?
When I do "hdparm -t" I get about 13 MB/s, which doesn't even come close
to 66MB/s ! But when i do "hdparm -T" I get about 60 MB/s, which looks
great, but since this involves cache readings it isn't really a fair
test.
My system is a p3-600 with 20gb maxtor drive (5400 rpm) running Suse
6.4, and I use "hdparm -c1 -u1 -d1 -X66 -k1".
Is there any way i can increase the performance (with software) ?
Emiel.
--
"I have opinions of my own - strong opinions - but I don't always agree
with them"
-George Bush
------------------------------
From: emiel <[EMAIL PROTECTED]>
Subject: idebus speed
Date: Tue, 08 Aug 2000 21:49:19 +0200
Hi,
When I boot Linux, one of the messages says:
"ide: Assuming 40MHz system bus speed for PIO modes; override with
idebus=xx"
Since the PCI bus runs at 66 mhz, shouldn't the above value also be
66Mhz?
If so, how can I set this value at boot (I don't want to key in
"idebus=66" at the lilo prompt everytime I boot).
btw. I use Suse 6.4
tia,
Emiel.
--
"I have opinions of my own - strong opinions - but I don't always agree
with them"
-George Bush
------------------------------
From: Craig McCluskey <[EMAIL PROTECTED]>
Subject: Re: Need Ideas For An ISA NIC
Date: Tue, 08 Aug 2000 14:52:00 -0500
Rick Bestany wrote:
> Can anyone recommend a good ISA card that I can use. preferably a 10/100 MB
> type.
I just bought a 3Com 3C515 on eBay for 11.50. From what I can see on the
'net, it should work in Linux.
There are more for sale there. Do a search on: ISA +10/100
Craig
------------------------------
From: Craig McCluskey <[EMAIL PROTECTED]>
Subject: Re: Printing to an HP4050N
Date: Tue, 08 Aug 2000 14:53:44 -0500
Don Farland wrote:
>
> I am trying to configure an HP-4050N as my network printer
On Red Hat for a 4000N called rikeswriter.ph.utexas.edu:
# /etc/printcap
#
# Please don't edit this file directly unless you know what you are
doing!
# Be warned that the control-panel printtool requires a very strict
format!
# Look at the printcap(5) man page for more info.
#
# This file can be edited with the printtool in the control-panel.
##PRINTTOOL3## REMOTE
lp:\
:sd=/var/spool/lpd/lp:\
:mx#0:\
:sh:\
:rm=rikeswriter.ph.utexas.edu:\
:rp=text:
Craig
------------------------------
From: Wolfgang Fritz <[EMAIL PROTECTED]>
Subject: Re: USB scanner for Linux?
Date: Tue, 08 Aug 2000 21:56:14 +0200
[EMAIL PROTECTED] wrote:
>
> hi
>
> are there USB scanners that work under Linux? which can you recommend?
>
> martin
Hi,
I have an EPSON Perfection 1200U. Very nice scanner, fast and well
supported.
For supported scanners look at http://www.mostang.com/sane/
Wolfgang
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.
------------------------------
From: Internet Support Pete <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
Crossposted-To: comp.os.linux.misc
Subject: Re: "Turbo" and X-windows.
Date: Tue, 08 Aug 2000 16:53:04 -0400
It doesn't really matter. You shouldn't have to switch between resolutions
very often in XFree86 anyway. You can get around this by specifiying one
resolution at a tim eand booting XF86. If it works to your satisfaction...
keep that resolution and don't bother changing it.
-Pete
Stanislaw Flatto wrote:
> Hi Linux users!
> Was browsing through Award BIOS setup on motherboard that I intended to
> buy when I came to "Ctrl+Alt+ +/-" as a way to
> change the "Turbo" status.
> OK I know this from past, but to find it on mobo which boasts 112M bus
> clock was a little odd.
> Anyway, how would this affect the changing of resolution in X-windows
> and what will respond to it - mobo speed or screen or both?
> Thanks for answers...
> --
> Stanislaw on Slak 7.1
> Registered on Linux counter No.162760.
> Even put Ulladulla on their database.
------------------------------
From: Internet Support Pete <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
Subject: Re: USB printer for Linux?
Date: Tue, 08 Aug 2000 16:53:47 -0400
Ask slashdot.org ;) Let the people tell you!
[EMAIL PROTECTED] wrote:
> hi
>
> what USB printers are supported by Linux? any recommendations?
>
> martin
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.
------------------------------
From: "Stefan Viljoen" <[EMAIL PROTECTED]>
Subject: HP DDS2 and DDS3 backward compatibility
Date: Tue, 8 Aug 2000 22:46:34 +0200
Hi!
Excuse me, this may be a bit OT:
Are HP DDS3 4mm DAT tapes downward compatible with HP DD2 - written 4mm DAT
tapes?
I have a situation at work were we are upgrading servers (SCO Unix) to
DDS3-using primaries, with a planned weekly switchon of "retired" DDS2
equipped servers and a load-to-synchronize on the old systems.
All this falls apart if the DDS2 drives on the old systems cannot read the
DDS3 written 4mm tapes originating on the new systems.
Anybody encountered this before? Can a HP DDS3 read a HP DDS2 written tape?
Thanks!
Stefan Viljoen
--
Starwars Forever!!!
mailto:[EMAIL PROTECTED]
http://home.intekom.com/rylan/
------------------------------
From: "wm" <[EMAIL PROTECTED]>
Crossposted-To: alt.os.linux,comp.os.linux.setup
Subject: Undesired video behavior
Date: Tue, 08 Aug 2000 21:12:57 GMT
Hi,
I recently loaded Redhat 5.2 on my Cyrix P150 machine, but seem to be
experiencing a undesired behavior with the video output. In simple
terms, it's as though the X Server is configured to output to a 21"
monitor, when in fact my monitor is only 15". I am able to view the
entire windowing environment, but only by using my mouse to move the
viewing area of the screen to the desired location.
Thanks for the help!
Walt
BTW, I did attempt to correct this problem by changing the resolution,
but to no avail.
------------------------------
From: [EMAIL PROTECTED] (Dances With Crows)
Subject: Re: Why is my harddisk so slow?
Date: 8 Aug 2000 21:23:21 GMT
Reply-To: [EMAIL PROTECTED]
On Tue, 08 Aug 2000 21:43:15 +0200, emiel wrote:
>But shouldn't udma/66 give a throughput of 66 MB/s (in theory) ?
That's the theoretical performance of the *bus*. The actual data
transfer rate of the head-disk assembly is *always* lower, and will
remain so for the forseeable future. Data density and drive RPM are
increasing, but hard drives involve moving physical things around, while
transferring things on the IDE bus involves moving electrons. Electrons
are easier to shift, and they go a lot faster.
Chalk it all up to Marketing, and put it in the same bin as the
"MHz wars" going on with modern processors.
>My system is a p3-600 with 20gb maxtor drive (5400 rpm) running Suse
>6.4, and I use "hdparm -c1 -u1 -d1 -X66 -k1".
>Is there any way i can increase the performance (with software) ?
Probably not. Buy more RAM if you want to up the performance...
--
Matt G|There is no Darkness in Eternity/But only Light too dim for us to see
Brainbench MVP for Linux Admin / Tyranny is always better organized
http://www.brainbench.com / than freedom.
=============================/ ==Charles Peguy
------------------------------
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