LVM snapshots vs. --link-dest
c182driver1 at gideon.org
Sun Sep 27 13:35:36 MDT 2009
On Sun, 27 Sep 2009 17:14:42 +0000, Andrew Gideon wrote:
> Where this "fails" is for large files that have received small changes.
> The directory containing my main IMAP account, for example, typically
> generates between 1 and 2 G of daily backup data as I file messages in
> my inbox. Yesterday, though, I filed some old messages in my inbox.
> This touched files I don't typically touch. They were minor changes in
> the scheme of things, but the result was an 11G backup of that volume
> last night.
Several people have emailed me suggesting that I change mailbox formats.
Rather than replying to each of them individually...
You're all quite right. I should (and eventually will) make that
change. I do appreciate the suggestion.
But my mailbox case was just one example of a general issue: --link-dest
doing nothing to save backup space in the case where a large file is
subjected to a small change. LVM snapshots may offer a solution to this
general problem, and it is that idea that I'm hoping to explore here.
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