On Mon, Sep 8, 2008 at 8:35 PM, Miles Nordin <[EMAIL PROTECTED]> wrote: > ps> iSCSI with respect to write barriers? > > +1. > > Does anyone even know of a good way to actually test it? So far it > seems the only way to know if your OS is breaking write barriers is to > trade gossip and guess. >
Write a program that writes backwards (every other block to avoid write merges) with and without O_DSYNC, measure speed. I think you can also deduce driver and drive cache flush correctness by calculating the best theoretical correct speed (which should be really slow, one write per disc spin) this has been on my TODO list for ages.. :( _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
