lkml.org 
[lkml]   [2007]   [Jun]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [ANNOUNCE] Btrfs: a copy on write, snapshotting FS
On Tue, 19 Jun 2007, Vladislav Bolkhovitin wrote:

>> > 3. De-de-duplicate blocks on disk, i.e. copy them on write
>> >
>> > I suppose that de-duplication itself would be done by some user space
>> > process that would scan files, determine blocks with the same data and
>> > then de-duplicate them by using syscall or IOCTL (2).
>> >
>> > That would be very usable feature, which in most cases would allow to
>> > shrink occupied disk space on 50-90%.
>>
>> Have you references for this number?
>
> No, I've seen it somewhere and it well confirms with my own observations.
>
>> In my experience one gets a lot of benefit from
>> the much simpler process of "de-duplication" of files.
>
> Yes, sure, de-duplication on files level brings its benefits, but on FS
> blocks level it would bring ever more benefits, because there are many more
> or less big files, which are different as a whole, but with a lot of the same
> blocks. Simple example of such files is UNIX-style mail boxes on a mail
> server.

unix style mail boxes would not be a good example of wins for sector-based
de-duplication since the duplicate mail is not going to be sector aligned.

David Lang

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-06-19 20:23    [W:0.091 / U:0.380 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site