Date: Tue, 12 Sep 2006 23:28:35 +0930 From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: freebsd-stable@freebsd.org Cc: Christian Laursen <xi@borderworlds.dk> Subject: Re: gjournal and Softupdates Message-ID: <200609122328.36605.doconnor@gsoft.com.au> In-Reply-To: <ygfirjto0z2.fsf@dominion.borderworlds.dk> References: <45066E19.2040405@kuehlbox.de> <ee5vat$fcb$1@sea.gmane.org> <ygfirjto0z2.fsf@dominion.borderworlds.dk>
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[-- Attachment #1 --] On Tuesday 12 September 2006 19:34, 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. You can disable write caching on your disks (most even honour it :) however a lot of people choke at the performance hit.. One big problem is that high capacity disks use track writing - if you modify a single sector the disk re-writes the whole track. If the power fails during the track write then you lose potentially completely unrelated data. This affects all file systems equally though. -- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (FreeBSD) iD8DBQBFBr0M5ZPcIHs/zowRAmpJAJ9pz20mKs49Pg8L4H5rpFUXd2AA6ACdEKKe mnce7A0RRAwbLfbRPcSKCds= =gPc3 -----END PGP SIGNATURE-----
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