> On Thu, 19 Mar 1998, Jason Duerstock wrote:
>
> > Is there any current or planned support for hierarchical storage
> > management in any of the Linux file systems? I would be really interested
> > to see something in ext2 (or maybe Coda since it's already chock full o'
> > userland fun) where a file could be set with an 'off-line' attribute at
> > which the I/O operation would block until a daemon could bring it
> > on-line...
> >
> > Am I totally off in left field here?
>
> Just a bit :-). We would want to support files that are
> larger than the 'caching device', so we shouldn't page in
> a complete file. Furthermore, as a file could be spread out
> over more 'background storage volumes', we'd want the application
> to unblock as soon as the first blocks of data have arrived.
>
> To do that, we'd need:
> - a Dvd-FS like, multi-volume support for the background media
> - a (kernel-level?) method for paging in/out chunks of file
> - some other bookkeeping thing
> - a way to warn the user that his file is on background storage,
> so he/she doesn't abort the program in frustration :-)
Okay...well, is this something we can add on to ext2 or another existing
FS, or is it better to start off from scratch? Or maybe move to ext3 and
throw 32-bit [GU]IDs + 64-bit file size support in as well? Is anyone
else interested in this kind of thing? :D
Jason
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