Date: Wed, 7 Nov 2007 13:50:28 +0100 From: "Ivan Voras" <ivoras@freebsd.org> To: "=?UTF-8?Q?Arne_W=C3=B6rner?=" <arne_woerner@yahoo.com> Cc: freebsd-current@freebsd.org Subject: Re: geom_raid5 inclusion in HEAD? Message-ID: <9bbcef730711070450x308129b4rb18577c317eee197@mail.gmail.com> In-Reply-To: <487375.1457.qm@web30309.mail.mud.yahoo.com> References: <fgs516$mj8$1@ger.gmane.org> <487375.1457.qm@web30309.mail.mud.yahoo.com>
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On 07/11/2007, Arne Wörner <arne_woerner@yahoo.com> wrote: > graid5 puts write requests for about kern.geom.raid5.wdt seconds (but not less > than 1-2 seconds) into the write cache (if there is enough space left in > graid5's write cache)... I would guess that this behaviour is pretty > incompatible with soft-updates with power outage... Can this cache be disabled? > Then there still is the write cache of the hard discs (I dont know how long it > waits, but that time would come in addition to graid5's delay)... > > Maybe gjournal could help, because graid5 honors the BIO_FLUSH, but that is > untested... Yes, AFAIK this would work.help
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