I tried to answer your mail, but your mailserver refuses my mail .
See below.
Mail Delivery Subsystem wrote:
----- The following addresses had permanent fatal errors -----
<joel AT wmi DOT com>
(reason: 550 5.7.1 Access denied)
----- Transcript of session follows -----
... while talking to mail.wmi.com.:
MAIL From:<paul.bijnens AT xplanation DOT com>
<<< 550 5.7.1 Access denied
554 5.0.0 Service unavailable
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Reporting-MTA: dns; tsunami.skynet.be
Arrival-Date: Thu, 12 Feb 2004 17:24:57 +0100
Final-Recipient: RFC822; joel AT wmi DOT com
Action: failed
Status: 5.7.1
Diagnostic-Code: SMTP; 550 5.7.1 Access denied
Last-Attempt-Date: Thu, 12 Feb 2004 17:25:08 +0100
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Subject:
Re: Backups that don't fit on the tape....
From:
Paul Bijnens <paul.bijnens AT xplanation DOT com>
Date:
Thu, 12 Feb 2004 17:24:56 +0100
To:
Joel Coltoff <joel AT wmi DOT com>
Joel Coltoff wrote:
On Thu, 12 Feb 2004, Paul Bijnens wrote:
I've got a followup on this. I'm going to run amtapetype to get values
for my Quantum DLT1. It has compression turned on. Do I want to turn
it off before I run amtapetype? It's not 100% clear from the archives
if I should do this. For my final capacity number do I simply take the
output and multiply by something in the range 1.6 - 1.8? (we'll never
get 2:1)
The hardware compression algorithm in most tapedrives actually
expands data that is not compressable (like random data, or already
compressed data).
Amtapetype wants to measure the native capacity of the bare tape.
Therefore it feeds random data. Thefore you should have hardware
compression disabled.
Some very new drives, and maybe a DLT1 is one of them, has an improved
algorithm that does not expand the data (or only by 0.1%, just like
gnuzip). For these drives it actually does not matter much. Maybe
it's ever better to do compression always, so that you can mix DLE
and dump some not-compressed (to safe CPU cycles) and let compression
over to the tapedrive.
--
Paul Bijnens, Xplanation Tel +32 16 397.511
Technologielaan 21 bus 2, B-3001 Leuven, BELGIUM Fax +32 16 397.512
http://www.xplanation.com/ email: Paul.Bijnens AT xplanation DOT com
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