Hi,
On Mon, Jun 05, 2000 at 10:40:05AM -0700, Chris Mason wrote:
>
> This is an idea from Hans. Instead of having a dedicated logging area on
> the disk, any block can be a log block. Unlike ext2, reiserfs metadata
> can be anywhere on the disk. Placement of these tree nodes is critical to
> performance, and the wandering logs idea allows you to log the block by
> simply writing it to a new (better) location. So, the metadata is
> effectively defragmented on the fly.
Yep, and it's a great idea. NetApps use the same sort of mechanism
(although with shadow-paged, not journaled, consistency) for their
own WAFL filesystem, and that fs really screams.
--Stephen
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