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Old 01-15-2004, 11:15 AM   #1
whysyn
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system time wrong after running cdrecord-prodvd


hello,

i've been archiving data from our database server by creating an iso, and then using cdrecord-prodvd to burn a dvd-r of the image.

the problem is after running cdrecord-prodvd, the system time is about 7 - 15 minutes slow. the actual time loss appears to be related to how big the dvd is. burning 2 gig will slow the clock about 7 minutes, but burning a full 4.4 gig will slow the clock aboiut 15...

has anybody heard of this before? any ideas on how to stop this from happening?
 
Old 12-31-2004, 11:15 AM   #2
whysyn
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bump
 
Old 12-31-2004, 11:47 AM   #3
Zyrix
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Have you tried reinstalling the program?

EDIT: what version are you using?

Last edited by Zyrix; 12-31-2004 at 11:50 AM.
 
Old 12-31-2004, 11:51 AM   #4
whansard
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do you have the rtc (real time clock) module loaded?
 
Old 01-03-2005, 10:59 AM   #5
whysyn
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whansard:
lsmod output does not show an rtc module. If that's not the right place to look for it, then you'll have to help me out :-)

Zyrix:
There is no reinstalling, it is a single file, and comes precompiled if i remember correctly...

[root@foo root]# cdrecord-prodvd -version
Cdrecord-ProDVD-Clone 2.01a23-2 (i686-pc-linux-gnu) Copyright (C) 1995-2003 Jörg Schilling
Unlocked features: ProDVD Clone
Limited features:
This copy of cdrecord is licensed for: private/research/educational_non-commercial_use


Thanks guys!

Edit: spelling :-)

Last edited by whysyn; 01-03-2005 at 11:01 AM.
 
Old 01-03-2005, 04:23 PM   #6
whansard
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you can try modprobe rtc and see what happens. if it loads, fine. if not then it's in the kernel already, or not built at all.
 
Old 01-05-2005, 11:42 AM   #7
whysyn
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Is there any other way to verify this is active? I'd prefer to not start experimenting with module insertions on a critical, stable production server.

Does the fact that I do have rtc in /dev mean anything?:
[root@foo root]# ls -l /dev/rtc
crw-r--r-- 1 root root 10, 135 Aug 30 2002 /dev/rtc
 
Old 01-05-2005, 08:24 PM   #8
whansard
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that device should exist whether or not the real-time clock module is running. running lsmod will show the inserted modules.
if you check your /lib/modules/<kernel-version> for a rtc.o and it exists, then you'll know it's not built into the kernel.

Last edited by whansard; 01-05-2005 at 08:25 PM.
 
Old 01-11-2005, 10:19 AM   #9
whysyn
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I found a copy of the .config file my kernel was built from; RTC is built directly in.

EDIT: What does this really mean? Should having RTC support improve my clock accuracy? The clock only drifts when cdrecord-prodvd is running, so I'd say accuracy in general is not an issue.

Last edited by whysyn; 01-11-2005 at 10:44 AM.
 
  


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