Date: Tue, 27 Jul 2004 00:34:55 +0200 From: Matthias Andree <ma@dt.e-technik.uni-dortmund.de> To: Scott Long <scottl@freebsd.org> Cc: bugghy <bugghy@home.ro> Subject: Re: magic sysrq keys functionality Message-ID: <m3k6wqjt2o.fsf@merlin.emma.line.org> In-Reply-To: <20040726114142.E32601@pooker.samsco.org> (Scott Long's message of "Mon, 26 Jul 2004 11:49:55 -0600 (MDT)") References: <1090718450.2020.4.camel@illusion.com> <200407251112.46183.doconnor@gsoft.com.au> <20040726152151.GC1473@green.homeunix.org> <20040726114142.E32601@pooker.samsco.org>
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Scott Long <scottl@freebsd.org> writes: > On Mon, 26 Jul 2004, Brian Fundakowski Feldman wrote: >> 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. I've had a SCS HDD lock up (1997 Micropolis 4345WS showing its age and bad interaction with an Adaptec 2940UW Pro[*]) while softdep was writing to the drive and suffered *SEVERE* file system corruption, which tore down my /var/db/pkg and other stuff. [*] The same adaptor used to lock up every other week in a different hardware environment. I haven't seen this kind of trouble with the Tekram DC-390U I used to use, but I was too lazy to replace the Tekram until now. -- Matthias Andree Encrypted mail welcome: my GnuPG key ID is 0x052E7D95 (PGP/MIME preferred)
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