RE: svn dump and load - half size repository?

Mark,

>-----Original Message-----
>From: Mark Phippard [mailto:markphip_at_gmail.com]
>Sent: 18 December 2009 15:01
>To: Ryan Schmidt
>Cc: Hardy, Andrew; users_at_subversion.tigris.org
>Subject: Re: svn dump and load - half size repository?
>
>On Fri, Dec 18, 2009 at 8:08 AM, Ryan Schmidt
><subversion-2009d_at_ryandesign.com> wrote:
>> On Dec 18, 2009, at 06:52, Andrew Hardy wrote:

>> The behavior you are observing in the revs directory is called
>> sharding and is new for Subversion 1.5, and was improved in
>1.6, and can lead to significant space savings:
>
>Sharding does not specifically bring disk space saving, it
>just helps some filesystem tools that slow down when you get
>too many files in a single folder, like backup scanning or
>browsing tools like Windows Explorer. It may bring some inode
>savings, but I am not sure.
>
>>
>> http://subversion.tigris.org/svn_1.6_releasenotes.html#fsfs-packing
>

>Packing will save a lot of disk space by freeing up all the
>wasted space in unused clusters, and will also greatly reduce
>inode usage.
>However, packing is not something that happens automatically,
>you have to run svnadmin pack.

I might give that a whirl during a quiet period!

>The most likely culprit is the new rep-sharing feature in 1.6. This
>allows duplicate "representations" to be shared. So imagine you
>committed 5 copies of the exact same ISO image. With 1.6,
>only one of those would be "stored" and the other 4 would all
>have pointers to the first. We typically see a 10-20% space
>improvement from this, but it is entirely dependent on how
>much common content there is. I would guess this is where the
>saving came from since this is on by default for a newly
>created repository.

We're still on 1.5.6, but this looks interesting...

Thanks for your help,

-- 
Andy
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