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Date: Sat, 29 Aug 2009 11:38:04 +0200 From: Pavel Machek <pavel@....cz> To: Ric Wheeler <rwheeler@...hat.com> Cc: david@...g.hm, Theodore Tso <tytso@....edu>, Florian Weimer <fweimer@....de>, Goswin von Brederlow <goswin-v-b@....de>, Rob Landley <rob@...dley.net>, kernel list <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...l.org>, mtk.manpages@...il.com, rdunlap@...otime.net, linux-doc@...r.kernel.org, linux-ext4@...r.kernel.org, corbet@....net Subject: Re: [patch] document flash/RAID dangers >> Example I seen went like this: >> >> Drive in raid 5 failed; hot spare was available (no idea about >> UPS). System apparently locked up trying to talk to the failed drive, >> or maybe admin just was not patient enough, so he just powercycled the >> array. He lost the array. >> >> So while most people will not agressively powercycle the RAID array, >> drive failure still provokes little tested error paths, and getting >> unclean shutdown is quite easy in such case. > > Then what we need to document is do not power cycle an array during a > rebuild, right? Yep, that and the fact that you should fsck if you do. > If it wasn't the admin that timed out and the box really was hung (no > drive activity lights, etc), you will need to power cycle/reboot but > then you should not have this active rebuild issuing writes either... Ok, I guess you are right here. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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