Re: [PATCH] LogFS take three

Jörn Engel
2007-05-17T12:28:21Z

On Thu, 17 May 2007 16:43:59 +0800, David Woodhouse wrote:
>
> > As I mentioned, some techniques like log-structured filesystem could
> > perform generally better on any kind of flash-based storage with FTL.
> > Although there are many kinds of FTL, it is commonly true that
> > it performs well under workload where sequential write is dominant.
>
> Yes, it's certainly possible that we _could_ write a file system which
> is specifically targeted at FTL -- I was just wondering why anyone would
> _bother_ :)

Haven't you done that already? JFFS2 write behaviour is the best-case
scenario for any FTL. When the delta cache is finished, LogFS will be
pretty close to that as well.

Not sure if anyone would specifically target FTL. Being well-suited for
those beasts is just a side-effect.

The FTL is still a net loss. Without that FAT enabling layer a real
flash filesystem would be more efficient.

Jörn

--
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