linux-ext4 - Re: [patch 0/5] Journal guided resync and support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20091124114319.GA1397@ucw.cz>
Date:	Tue, 24 Nov 2009 12:43:19 +0100
From:	Pavel Machek <pavel@....cz>
To:	scjody@....com
Cc:	linux-ext4@...r.kernel.org, linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org, Andreas Dilger <adilger@....com>
Subject: Re: [patch 0/5] Journal guided resync and support

Hi!

> This is an updated implementation of journal guided resync, intended to be
> suitable for production systems.  This feature addresses the problem with RAID
> arrays that take too long to resync - similar to the existing MD write-intent
> bitmap feature, we resync only the stripes that were undergoing writes at the
> time of the crash.  Unlike write-intent bitmaps, our testing shows very little
> performance degredation as a result of the feature - around 3-5% vs around 30%
> for bitmaps.

Good. Now when fs know about raid and wise versa... perhaps it is time
to journal surrounding data on stripe so that power fails do not
destroy data on degraded raid5?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html