On Fri, 9 May 2008, dy018 wrote:

>
> Thanks for the info, but i think the example that you stated, the 10gb that 
> shrunk to 1gb, is this backup? or shld i say restorable?
You would be able to restore it, but it would be somewhat corrupt, the MD5SUM
would not match.

>
> Some one email me saying that the file that flag out this error might be 
> corrupted. I guess these error files in that backup image will not be 
> restorable.
AFAIK you can restore them but like you said and I mentioned earlier, they
will be corrupt.

>
> But i'm trying to understand this.
> I know before backup starts, NBU will compile the backup list.
>
> Question, given the below filelist
> /export1
> /export2
> /export3
>
> I notice NBU will backup /export1 first followed by /export2 and so on,
Correct.

> does NBU take a snapshot of the file inside the directory one by one or as a 
> whole? Cos if the filesize change from 10GB to 1GB, it needs to compare the 
> actual file will the snapshot file. Correct me if i'm wrong
There are no snapshots by default as far as I am aware in UNIX.  It first
scans the directory trees and puts them into memory and then backs up the
list.

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