On Thu, Jul 14, 2005 at 09:52:53PM +0200, Matthias Buelow wrote: > Kevin Oberman wrote: > > >The problem is that disks lie about whether they have actually written > >data. If the power goes off before the data is in cache, it's lost. > > No, the problem is that FreeBSD doesn't implement request barriers > and that softupdates is flawed by design and seemingly could not > make use of them, even if they were available (because, as I > understand it, it relies on a total ordering of all writes, unlike > the partial ordering necessary for a journalled fs). > > Until a journalled fs that uses write request barriers is available > for FreeBSD, you better had a reliable UPS.
How do OS-level request barriers help if the disk reorders pending writes in its cache? _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
