Messages in this thread | | | Date | Fri, 29 Oct 1999 12:18:19 -0700 | From | Mike Touloumtzis <> | Subject | Re: jfs/linux |
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On Fri, Oct 29, 1999 at 10:19:35AM -0500, Shawn Leas wrote: > > And I should have mentioned, even if DTFS was usable right now, > it doesn't de-allocate blocks, and is still in need of an fs > cleaner. > > Log strustured filesystems (as discussed previously on l-k) have > performance issues due to the "append" rather than "modify in place" > nature in which writes happen. > > The benefit comes in things like snapshots, where you can preserve > metadata at some point in time, basically having a readonly copy > of the whole FS from time HH:SS. >
Log-structured file systems are also very interesting for Flash-ROMs in embedded devices. Wear leveling is a big concern there, seek time is not. Reconciling proper GC with decent random access times is still the trick, though.
miket
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