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Old 2004-07-05, 01:40   #1
optim
 
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Nov 2003
European Union

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Unhappy corrupt tar.gz file

Hello, I performed some upgrades to a computer recently and I backed up my whole MPrime 23.5.2 directory in a tar.gz file. (I use Linux Suse 9,1). Then, I uploaded my backup to my yahoo mail and performed the system upgrade (changed disks from ata to sata, new case, new dvd, reinstalled suse on new disk etc etc).

I just finished reinstalling suse an hour ago. Downloaded my mprime backup from yahoo mail and tried to gunzip and tar-x it (that is, uncompress it!). Something went wrong, tar was refusing to terminate or output anything. Checked the downloaded tar.gz file: 6MB. But I am pretty sure my backup tar.gz was only 4-4.5MB. how is it possible?

Tried Ark, a graphical archiver. It said it is corrupt and impossible to uncompress. Damn. I managed to uncompress individual files however, and recovered the files I needeed to resume my M33 crunching. Now I just downloaded again mprime from mersenne.org

The question is: Should I trust these recovered files from a corrupt tar.gz archive?

local.ini mY011451 prime.ini prime.log results.txt worktodo.ini

is there any possibility to encounter errors in mprime because of this? maybe it would be better to start crunching another number from the begginning?
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Old 2004-07-05, 05:34   #2
garo
 
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If Prime95 is crunching without complaining, you are good to go. BTW, how did you manage to uncompress the individual files?

My guess is that when you uploaded the file to yahoo it was encoded BASE64. That would also explain the increase in size. You should be able to recover it after performing a reverse encode.
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Old 2004-07-05, 07:38   #3
optim
 
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I used Ark, a graphical tool under KDE, to extract individual files.
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Old 2004-07-05, 13:46   #4
Xyzzy
 
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I always get a md5sum of the file before I upload it...
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Old 2004-07-05, 18:54   #5
Reboot It
 
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With critical stuff like that I always download the file straight away after uploading it and do a bit-for-bit compare. If that works, I know I can trust the whole process.

Yes, I know, the words "door", "horse", "shutting" and "bolted" come to mind, but there's always next time.
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