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Date: Fri, 11 Jun 2004 09:34:52 +0200
From: Pawel Jakub Dawidek <pjd@FreeBSD.org>
To: Poul-Henning Kamp <phk@phk.freebsd.dk>
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Subject: Re: Correct GEOM bio handling
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On Thu, Jun 10, 2004 at 10:13:08PM +0200, Poul-Henning Kamp wrote:
+> Some implementations use compressed bitmaps, so that they know that
+> bits where a normal write happened can be skipped by the rebuilder.

I'm using bitmaps to do sychronization in geom_mirror.
It works quite ok.

+> Some even use "parasitic rebuild" where normal reads are written
+> to the bad plex as well (if not already up to date) in order to
+> save on the I/O operations.

Nice idea, I need to put it into geom_mirror:)

--=20
Pawel Jakub Dawidek                       http://www.FreeBSD.org
pjd@FreeBSD.org                           http://garage.freebsd.pl
FreeBSD committer                         Am I Evil? Yes, I Am!

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