Date: Mon, 26 Jul 2004 11:49:55 -0600 (MDT) From: Scott Long <scottl@freebsd.org> To: Brian Fundakowski Feldman <green@freebsd.org> Cc: bugghy <bugghy@home.ro> Subject: Re: magic sysrq keys functionality Message-ID: <20040726114142.E32601@pooker.samsco.org> In-Reply-To: <20040726152151.GC1473@green.homeunix.org> References: <1090718450.2020.4.camel@illusion.com> <200407251112.46183.doconnor@gsoft.com.au> <20040726152151.GC1473@green.homeunix.org>
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On Mon, 26 Jul 2004, Brian Fundakowski Feldman wrote: B> On Sun, Jul 25, 2004 at 09:23:36PM +0000, bugghy wrote: > > Yeah but it sometimes "freezes" (no reboot) ... and I'd rather umount my > > filesystems before rebooting. > > SoftUpdates guarantess that your file systems will not get corrupt. > This isn't entirely correct. Softupdates guarantees that you won't get corruption due to metadata pointing to invalid or stale data blocks. That's not the same as guaranteeing that there won't be any corruption. Write caching on the drive combined with an in-opportune power loss or other failure can easily leave you with corrupt or incomplete metadata and/or data blocks. A panic while metadata is being committed to disk can also leave the metadata highly inconsistent and prone to corruption. This isn't to say the SU is bad or that other strategies are necessarily better, just that there are definite risks. Scott
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