[CentOS] Rsync and differential Backups

Mon Nov 9 19:50:39 UTC 2015
Valeri Galtsev <galtsev at kicp.uchicago.edu>

On Mon, November 9, 2015 1:41 pm, Gordon Messmer wrote:
> On 11/09/2015 11:34 AM, Valeri Galtsev wrote:
>> I wonder how filesystem behaves when almost every file has some 400 hard
>> links to it. (thinking in terms of a year worth of daily backups).
> Why do you think that would be a problem?

Probably not. You are not impacting something that has notably finite
count (like inode count on given fs). You just use a bit more disk space
for metadata which is nothing (space wise) compared to data (the files
themselves). Thanks!

> Most inodes have one hard link.  When that link is removed, the link
> count in the inode is decremented (inodes are reference-counted, you can
> see their ref count in "ls -l" output).  When the link count reaches 0
> and no open file descriptors exist, the inode is removed.
> Creating more hard links just increases the ref count.  That's it. It's
> not a weird special case.
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Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247