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 ----- <[EMAIL PROTECTED]> (reason: 550 5.7.1 Access denied)
----- Transcript of session follows ----- ... while talking to mail.wmi.com.:
MAIL From:<[EMAIL PROTECTED]>
<<< 550 5.7.1 Access denied 554 5.0.0 Service unavailable
------------------------------------------------------------------------
Reporting-MTA: dns; tsunami.skynet.be Arrival-Date: Thu, 12 Feb 2004 17:24:57 +0100
Final-Recipient: RFC822; [EMAIL PROTECTED] 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
------------------------------------------------------------------------
Subject: Re: Backups that don't fit on the tape.... From: Paul Bijnens <[EMAIL PROTECTED]> Date: Thu, 12 Feb 2004 17:24:56 +0100 To: Joel Coltoff <[EMAIL PROTECTED]>
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: [EMAIL PROTECTED] *********************************************************************** * I think I've got the hang of it now: exit, ^D, ^C, ^\, ^Z, ^Q, F6, * * quit, ZZ, :q, :q!, M-Z, ^X^C, logoff, logout, close, bye, /bye, * * stop, end, F3, ~., ^]c, +++ ATH, disconnect, halt, abort, hangup, * * PF4, F20, ^X^X, :D::D, KJOB, F14-f-e, F8-e, kill -1 $$, shutdown, * * kill -9 1, Alt-F4, Ctrl-Alt-Del, AltGr-NumLock, Stop-A, ... * * ... "Are you sure?" ... YES ... Phew ... I'm out * ***********************************************************************
