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Re: xfsdump questions

To: Stevie Trujillo <stevie.trujillo@xxxxxxxxx>
Subject: Re: xfsdump questions
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Tue, 23 Dec 2014 07:43:25 +1100
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20141219095738.6b6e6c88@localhost>
References: <20141219095738.6b6e6c88@localhost>
User-agent: Mutt/1.5.21 (2010-09-15)
On Fri, Dec 19, 2014 at 09:57:38AM +0100, Stevie Trujillo wrote:
> Hello!
> Is xfsdump an ancient relic or something recommended to new users (I
> have never seen anyone recommending it)? I gave it a try and found the
> incremental backups to be really fast!

Still supported, still works, still used in production by lots of

> How are incremental backups implemented? I saw that my inventory file
> is really small. Does it use some internal xfs metadata to detect
> changes? Is it resilient against all kinda renames and changing
> timestamps etc that a user might do? (I've previously used a backup
> system that broke when doing stuff like that)

It should detect renames and changing timestamps, etc. without any

> Is it possible to backup (and restore) ctimes?


> I read that the incremental backups are limited to a depth of 10. Are
> they intended to be used in a binary tree like fashion?

In theory. Not sure anyone actually uses incremental dumps like that
though, so you'd need to do a bunch of testing before deploying such
a solution.


Dave Chinner

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