Date: Sat, 06 Nov 1999 19:27:20 +0100 From: Mattias Pantzare <pantzer@ludd.luth.se> To: Bernd Walter <ticso@cicely.de> Cc: freebsd-fs@FreeBSD.ORG Subject: Re: RAID-5 and failure Message-ID: <199911061827.TAA22113@zed.ludd.luth.se> In-Reply-To: Message from Bernd Walter <ticso@cicely.de> of "Sat, 06 Nov 1999 18:33:16 %2B0100." <19991106183316.A9420@cicely7.cicely.de>
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> If the system panics or power fails between such a write there is no wa= y to > find out if the parity is broken beside verifying the complete plex aft= er > reboot - the problem should be the same with all usual hard and softwar= e > solutions - greg already begun or finished recalculating and checking t= he > parity. This is realy a optimisation issue, if you just write without using two-phase commit then you have to recalculate parity after a powerfailure= =2E = (One might keep track of the regions of the disk that have had writes lat= ly = and only recalculate them) Or you do as it says under Two-phase commitment in http://www.sunworld.com/sunworldonline/swol-09-1995/swol-09-raid5-2.html.= To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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