* xfsdump questions
@ 2014-12-19 8:57 Stevie Trujillo
2014-12-22 20:43 ` Dave Chinner
0 siblings, 1 reply; 3+ messages in thread
From: Stevie Trujillo @ 2014-12-19 8:57 UTC (permalink / raw)
To: xfs
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!
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)
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?
--
Stevie Trujillo
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: xfsdump questions
2014-12-19 8:57 xfsdump questions Stevie Trujillo
@ 2014-12-22 20:43 ` Dave Chinner
2014-12-23 0:13 ` Stevie Trujillo
0 siblings, 1 reply; 3+ messages in thread
From: Dave Chinner @ 2014-12-22 20:43 UTC (permalink / raw)
To: Stevie Trujillo; +Cc: xfs
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
people.
> 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
problems.
> Is it possible to backup (and restore) ctimes?
No.
> 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.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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