Date: Tue, 12 Sep 2006 13:26:35 +0200 From: Christian Laursen <xi@borderworlds.dk> To: freebsd-stable@freebsd.org Subject: Re: gjournal and Softupdates Message-ID: <ygfejuhnx5g.fsf@dominion.borderworlds.dk> In-Reply-To: <ee63ue$tel$1@sea.gmane.org> (Ivan Voras's message of "Tue, 12 Sep 2006 12:59:13 %2B0200") References: <45066E19.2040405@kuehlbox.de> <ee5vat$fcb$1@sea.gmane.org> <ygfirjto0z2.fsf@dominion.borderworlds.dk> <ee63ue$tel$1@sea.gmane.org>
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Ivan Voras <ivoras@fer.hr> writes: > Christian Laursen wrote: >> Ivan Voras <ivoras@fer.hr> writes: >> >>> - todays desktop drives can lie about writing data. SoftUpdates relies >>> on some assumptions about when the data is physically written to >>> media, and those are not always valid today >> >> I think journaling relies on the same assumptions. > > Doesn't it rely less since a journal is written sequentially, but SU > expects ordering of many writes to different parts of the file system > to be persistent and in sequence? Journaling also needs writes to be done in the correct order. You don't want to write the real update to the filesystem before you have made sure that it has been committed to the journal. If that can happen you are no better off than without the journal. -- Christian Laursen
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