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[Rdiff-backup-bugs] [bug #27296] RFE: hardlink sharing between multiple
From: |
Joshua Jensen |
Subject: |
[Rdiff-backup-bugs] [bug #27296] RFE: hardlink sharing between multiple archive backups |
Date: |
Fri, 21 Aug 2009 16:05:33 +0000 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.2) Gecko/20090803 Fedora/3.5.2-2.fc11 Firefox/3.5.2 |
URL:
<http://savannah.nongnu.org/bugs/?27296>
Summary: RFE: hardlink sharing between multiple archive
backups
Project: rdiff-backup
Submitted by: joshmule
Submitted on: Fri 21 Aug 2009 04:05:32 PM GMT
Category: None
Severity: 3 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
_______________________________________________________
Details:
I ask because I have 2000 (yes, two thousand) machines to back up. At least
90% of data on each machine is the same... basic Linux filesystems, mostly /
and /var and /usr partitions.
I wonder if it would be worthwhile to add a feature to rdiff-backup that
would look to hardlink files that different rdiff-backup archives have in
common?
Right now, the hard link savings is only per machine's, say, /usr
partition. Sure, the incremental backup from the same machine
benefits from this; only any differences are recorded.
But right next to that archive directory on the backup server I have a
thousand other archvies with a /usr archive that is mostly identical. Why not
have the option to make rdiff-backup
be able to use some sort of higher level "all these archives can share
hardlinks" capability? The space saving would be staggering for multihost
backups.
I was thinking that rdiff-backup could just keep an additional
hardlink-only list of files/checksums that any individual run could
reference, thus giving it a perspective outside of that individual backup.
When it found a file that was already on that global/group list, it need not
transfer it, only hardlink to it. This could make storing similar files MUCH
more space and network efficient.
Thoughts?
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