[Nottingham] Depth first or breadth first for faster backups?

ForkBombFluf fluf at freeshell.org
Sat May 5 08:48:13 BST 2007


Hi Dale,

Your e-mail is getting through.  Welcome to the group.

You might try starting a new thread to say hello, if you tack something 
new onto an existing thread that not everyone is reading you might not get 
much response.

Take care,

-The Mysterious "S" (Sidekick to the Mysterious "A")

On Sat, 5 May 2007, Dale Einarson wrote:

> Date: Sat, 5 May 2007 00:32:56 +0100
> From: Dale Einarson <Dale.Einarson at nottingham.ac.uk>
> Reply-To: nottingham at mailman.lug.org.uk
> To: nottingham at mailman.lug.org.uk
> Cc: dale at bic.mni.mcgill.ca
> Subject: Re: [Nottingham] Depth first or breadth first for faster backups?
> 
> Heyla, ( 5th try to get an email to the list )
> -- I'm new to the group,  this is my first post ( hello everyone )
>
> Phil Lakin wrote:
>> I highly recommend amanda (www.amanda.org) for tape backups, also works
>> quite well to disk. Ideal if you have a lot of partitions / disks /
>> servers to backup. We use it to backup and restore over 10TB with no
>> trouble.
>> 
>   Rsync is great for many things but if you want an archive with an
> history,  I second the amanda suggestion.  It can be a bit finicky at
> first but once it gets going...
>
>   I have found a spanning tapes deficit;  If the directory you wish to
> back up is larger then the tape size ( or the dumper directory ) it will
> fail.  You need to break your source directories in the chunks that are
> smaller then the tapes ( or dumper directories ) you backup to.
>
>  In the past I had used amanda to make nightly backups of my files to a
> temp disk.  very fast and useful for a quick restore of the important
> working files!
>
> I could provide you with my conf if this might help.
>
>
>> On Wed, 2007-05-02 at 13:26 +0100, Martin wrote:
>> 
>>> OK Folks,
>>> 
>>> A question for tonight:
>>> 
>>> For traversing through directories and files, what should be the faster:
>>> 
>>> Walking through the directories and files going depth first or breadth
>>> first?
>>> 
>>> I would guess that just doing a simple "dd" would be quickest and
>>> minimise HDD head movements... But then that's only useful if you're
>>> near 100% utilisation and you're going to mount the dd copy as an image!
>
> The height and depth and breath my search can reach? (EBB)
>   gnufind is depth first, I assume that would be the fastest way.
> Certainly the FS does play a part of the data storage...  However, if
> the FS is stagnant the slocate should do the job as reading on file is
> faster then traversing directories
>
>
> Cheers!
> dale
>
> PS:
>  There seems to be some hangup with mail between machproductions and
> lug.org.uk... lug.org.uk is not getting my machprod email, but I have
> just found that it is not sending to machprod either :(
>  Thanks to Martin for his help.
>
>
>>> On a related theme:
>>> 
>>> What utilities do people use for their backups?
>>> 
>>> 
>>> See ya later,
>>> 
>>> Cheers,
>>> Martin
>>> 
>>> 
>
>
>
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