BackupPC-users

Re: [BackupPC-users] Pool duplicates and corrupted backups

2008-10-31 00:54:21
Subject: Re: [BackupPC-users] Pool duplicates and corrupted backups
From: Adam Goryachev <mailinglists AT websitemanagers.com DOT au>
To: "General list for user discussion, questions and support" <backuppc-users AT lists.sourceforge DOT net>
Date: Fri, 31 Oct 2008 15:52:39 +1100
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Jeffrey J. Kosowsky wrote:
> Types of Duplicate checksums:
> 3. Same checksums, different compressed content, same zcatted content
>               As per my earlier email, I found at least one of these 
>               and am not sure why they even exist.

AFAIK, it could be due to a change in the compresslevel, this should
produce different compressed content even though the original content is
identical. Also, the files are stored to the cpool based on a checksum
calculated before compression, hence they have the same name. The only
caution here is that I was of the impression that backuppc would see the
existing file with the same checksum and so not store the differently
compressed file.

> 4. Files with *NO* pool entries. 
>               This seems to be what occurs with the
>               files in my error log that cite the failure of 
>               MakeFileLink
> 
> The deeper I probe into this, the more confused I get and the more I
> worry about data integrity on my system...

That is why you will need to fix your NFS problems, and/or consider
moving to a different setup. eg, ATAoE, iSCSI, or local HDD's....


Did you check the details from the URL I sent through the other day? One
of the items on the list is to look at the number of time there is no
NFS thread available to service the request... I found fixing this
drastically improved my situation though didn't solve it (until I
replaced the faulty RAM in the client :)

Regards,
Adam
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