Date: Sat, 5 May 2007 07:30:02 -0700 (PDT) From: Arne "Wörner" <arne_woerner@yahoo.com> To: Ivan Voras <ivoras@fer.hr>, freebsd-geom@freebsd.org Subject: Re: graid5 after-reboot problem Message-ID: <398236.18997.qm@web30309.mail.mud.yahoo.com> In-Reply-To: <f1i3s4$j4n$1@sea.gmane.org>
next in thread | previous in thread | raw e-mail | index | archive | help
--- Ivan Voras <ivoras@fer.hr> wrote: > Arne Wörner wrote: > > > (that disables the write cache in graid5, which slows down write requests) > > 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? > I cant... :-) Just like many ATA disks, that just cant turn off their write cache... (but graid5 can at least turn off its write cache) But graid5 is aware of BIO_FLUSH... :-)) So somewhen UFS might send a BIO_FLUSH when it is appropriate... Or gjournal sends the BIO_FLUSH... -Arne __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?398236.18997.qm>