Re: Split some metadata onto separate device?

[Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx>]

On Wed, 08 Jun 2011 21:48:52 +0900 (JST), Ryusuke Konishi wrote:
> On Fri, 3 Jun 2011 19:42:28 +0200, dexen deVries wrote:
> > By the way, it seems to me that the in-kernel GC does not attempt to
> > de- fragment files. Is that the case? If so, would probably mean
> > extents would not help very much for fragmented files. Also, on
> > magnetic media, a lot of seeking happens in case of fragmented
> > files.
> 
> Yes, but extents will decrease the amount of metadata, and this has
> potential for speed up.
> 
> NILFS2 uses 32 bytes metadata per disk block at present.  I guess you
> know that the number of DAT blocks are actually indispensable through
> analysis using the dumpseg tool.

Oh, looks confusing.  I meant the amount of DAT blocks is not
negligible.

Regards,
Ryusuke Konishi
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