Date: Sun, 06 May 2007 03:04:23 +0200 From: Ivan Voras <ivoras@fer.hr> To: =?UTF-8?B?RGFnLUVybGluZyBTbcO4cmdyYXY=?= <des@des.no> Cc: freebsd-geom@freebsd.org Subject: Re: graid5 after-reboot problem Message-ID: <463D2997.2050207@fer.hr> In-Reply-To: <86fy6bqocr.fsf@dwp.des.no> References: <171980743.20070504223126@uzvik.kiev.ua> <125507.38194.qm@web30304.mail.mud.yahoo.com> <f1i3s4$j4n$1@sea.gmane.org> <86fy6bqocr.fsf@dwp.des.no>
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[-- Attachment #1 --] Dag-Erling Smørgrav wrote: > Ivan Voras <ivoras@fer.hr> writes: >> Is the write cache in graid5 aware of what happens on the VFS / UFS >> layers (something like gjournal does)? Otherwise, how can you guarantee >> consistency with write caching at the GEOM layer when there's a power >> outage or some other system interruption? > > You can't. Google for "RAID 5 write hole" for an explanation. It was a rhetorical question :) [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFGPSmXldnAQVacBcgRAgk6AKCfoUPOm1TmzicxoGEE5LsgRCNcVQCgtLyh 7EfkINylR0hIyhjrtsGpIVU= =ky+m -----END PGP SIGNATURE-----
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