Tuomas Leikola wrote: > 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.. :(
Does the perl script at http://brad.livejournal.com/2116715.html do what you want? -- James Andrewartha _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
