Re: snapshot limit?

[David Pottage <david@electric-spoon.com>]

 On 17/08/10 19:40, K. Richard Pixley wrote:
> On 8/17/10 11:05 , Dhiru Kholia wrote:
>> On Tue, Aug 17, 2010 at 10:41 AM, K. Richard Pixley <rich@noir.com
>> <mailto:rich@noir.com>> wrote:
>>  >  Is there a limit to the number of snapshots that can exist on a file
>> system
>>  > concurrently?
>>
>> According to https://help.ubuntu.com/community/btrfs "You can create
>> as many subvolumes as you want, as long as you have storage capacity."
>>
>> -- 
>> Cheers,
>> Dhiru
>>
>
> Yes.  But if there's a limit to the number of paths that can point to
> a single file, then that's not strictly true.  Rather, there's a limit
> based on the number of snapshots pointing to the same file.

Would that limit also apply to de-duplicated copies of a file ?

Suppose I have tree under a btrfs file-system with lots of identical
files. (eg zero length lock files), and I run a de-duplication script on
it, to turn all those files into one, and then make a series of snapshots.

100 identical files multiplied by 100 snapshots (eg. daily for a few
months), comes to a rather large number of links pointing to the same file.

-- 
David Pottage