DragonFly kernel List (threaded) for 2003-09
Re: Ridiculous idea: Cache as ramdisk?
Matthew Dillon wrote:
:Journalling file systems seem to be rather optimized for recovery, vs
:the impression I get when I hear the word "journalling" - I think of
:something more like CVS, where you can get any older version of a file
:merely by requesting a different tag. Such a "write once" filesystem
:would be very nice to use, I think.
:Anyway... back to your regularly scheduled BSD forking...
:-Chris (in Vancouver, if you care)
There are major advantages to being able to access a filesystem
as of some date in the past. For example, it makes 'undelete' work
very precisely. Another huge advantage to a properly journaled
filesystem is that one can run a continuously streaming 'incremental
backup' of the filesystem as well as use such a stream to maintain a
fully independant off-site copy of the filesystem in near real time.
Look no further, turn yourselves to The Elephant File System,
``a file system that never forgets''. Also, it seems to have
been implemented on a FreeBSD 2.2 VFS implementation. 8-)
I cannot find lots of information on this, but the following
URL's should help:
 - http://citeseer.nj.nec.com/santry99deciding.html
 - Google ``The Elephant File System''