Problems unmounting/fssyncking extern UFS filesystem

Christopher Sean Hilton chris at
Tue Nov 28 13:41:23 PST 2006

On Tue, 2006-11-28 at 11:51 -0800, Kevin Oberman wrote:

[ ... ]

> The magic phrase is "buffer cache has been flushed". In the real world
> of discs with cache there is no way to be certain when the data is
> REALLY on the disc. That is why things get clobbered if the power is
> cycled to the disc too soon after syncing and why a sleep (or typing
> sync three times) is still a good idea and probably always will be.

Please understand that this is an honest question but isn't that true
only of IDE heritage drives. E.g. If a SCSI drive with Tagged Queuing
says that the the bits have been written doesn't it mean that the bits
have really been written?

-- Chris

More information about the freebsd-stable mailing list