Mark Best wrote:
> I have some questions about pooling and rsync checksum.
They happen separately, and may have different answers.
> Let’s suppose I have two servers Server1 and Server2.
>
> 1) For redundancy and performance reasons I have the two servers syncing
> data between each other.
>
> 2) Server1’s file structure is: C:\server1\backup.tiff and it syncs
> using DFS to Server2’s file: C:\server2\backup.tiff.
>
> 3) The files are technically the same file – but are on different
> servers and have different directories they reside in.
>
> 4) Server1 is scheduled to backup at 6:00pm Server2 is scheduled at 5:00am.
>
>
> During a full rsync backup will the rsync client transmit both files?
> (Even if they are in different directories.)
Yes, the rsync comparison is done against the previous copy in the
per-pc tree, so whether the file (or differences) are transmitted will
depend on the specific machine contents (current and previous).
> If two files are transmitted will BackupPC pool both of these like-files
> into one?
Yes, after the complete new copy has been reconstructed, the pooling
mechanism will match it up with an existing pooled duplicate.
> Based on the above how will rysnc’s checksum check the files above
> during an incremental backup?
It's the same as a full, except that if the file name, timestamp, and
length match the existing copy it skips the block-checksum comparisons.
> If a change is made to Backup.tiff, and Server1’s incremental backup
> runs first and ‘updates’ the file to the pool – will Server2’s rsync
> ‘Passover’ the file because it’s been updated by Server1’s rsync
> transmittal?
No, the transmission is controlled by the per-pc contents.
> Basically, I’m interested in maximize pooling efficiency and shortening
> backup times – but worry because of the differences in directory folders
> and NTFS/DFS file system and whether the Inode/meta-data pooling is
> forgiving enough.
If you have a 'master' copy and a mechanism to clone it exactly to one
or more duplicates, why not exclude the copies that you can already
reproduce and just back up the master?
--
Les Mikesell
[EMAIL PROTECTED]
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