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Hello

I'am suffering problems while using rdiff-backup. Everytime i run
"rdiff-backup --verify backup" i encounter the following message

Warning: Computed SHA1 digest of <File>
da39a3ee5e6b4b0d3255bfef95601890afd80709
doesn't match recorded digest of
8d6456e1edd72c51df570f331e40261b4f246b70
Your backup repository may be corrupted!

I set up a backup from scratch. Even on a clean/new disk this error
occures. Is there some technical problems with large files (>2 GB).

System Info:
Ubuntu 10.04
BackupSource 4TB Raid6 Device (Raid is Verified/OK) - XFS File system
BackupTarget 2TB LVM Device (Device Status OK) - XFS File system


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Am 16.07.2011 15:29, schrieb Christian Kölpin:
Hello

I'am suffering problems while using rdiff-backup. Everytime i run
"rdiff-backup --verify backup" i encounter the following message

Warning: Computed SHA1 digest of <File>
da39a3ee5e6b4b0d3255bfef95601890afd80709
doesn't match recorded digest of
8d6456e1edd72c51df570f331e40261b4f246b70
Your backup repository may be corrupted!

I set up a backup from scratch. Even on a clean/new disk this error
occures. Is there some technical problems with large files (>2 GB).

System Info:
Ubuntu 10.04
BackupSource 4TB Raid6 Device (Raid is Verified/OK) - XFS File system
BackupTarget 2TB LVM Device (Device Status OK) - XFS File system


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rdiff-backup-users mailing list at rdiff-backup-users < at > nongnu.org
https://lists.nongnu.org/mailman/listinfo/rdiff-backup-users
Wiki URL: http://rdiff-backup.solutionsfirst.com.au/index.php/RdiffBackupWiki
ok i do some more investigation.
I changed from xfs to ext4 (just to check).

Then i do a clean backup again (from scratch). Run --verify and again
some mismatching SHA1 occurs.
To check the files i run "cmp <source> <backup>', and i get, that there
are some bytes changed. The files have exactly the same size but some
bytes are "changed". I run e2checkfs, but it says "all fine".

Has anyone some idea?

greetings
Raptor 2101



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Hi Christian,

On Sat, 16 Jul 2011, Christian Kölpin wrote:

Warning: Computed SHA1 digest of <File>
da39a3ee5e6b4b0d3255bfef95601890afd80709
doesn't match recorded digest of
8d6456e1edd72c51df570f331e40261b4f246b70
Your backup repository may be corrupted!

[snip]
ok i do some more investigation.
I changed from xfs to ext4 (just to check).

Then i do a clean backup again (from scratch). Run --verify and again
some mismatching SHA1 occurs.
To check the files i run "cmp <source> <backup>', and i get, that there
are some bytes changed. The files have exactly the same size but some
bytes are "changed". I run e2checkfs, but it says "all fine".

Has anyone some idea?

My first guess would be bad ram. Run memtest86+ for at least 12 hours (or
less if it reports problems, no point in testing bad ram for more errors).

Other things to check would be your power supply, the timings for cpu,
ram, and bus, or ide/sata cables and connections.

You could also try to find reports of other people getting corruption or
instability issues with your type of mainboard, chipset, ram, etc. I've
had timing issues with Via chipsets in the past, that didn't show up in
memtest, but got several faulty md5sums of a 100MB file when repeatedly
checking it. Underclocking the ram to match cpu core speed solved that
issue. (Happened consitently with several mainboards and several brands of
ram, my ram was fine...)


If you don't get memtest errors, report back here with some more info
about your hardware.

Memtest can be downloaded at: www.memtest.org


Hope this helps..

--
Maarten
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