On Mon, Feb 14, 2011 at 02:56:37PM -0800, Doug Dumitru wrote: > Not to be too cute, but the man page for mdadm says that > --write-behind is only attempted on drives marked --write-mostly. I > did not see a --write-mostly in your array create statement. Yeah, I abbreviated it as -W: > > mdadm --create /dev/md/ssdraid --force --assume-clean --level=1 \ > > --raid-devices=3 --bitmap=internal --bitmap-chunk=262144 \ > > /dev/sdo2 --write-behind=16383 -W /dev/sd[nm]2 > Also, are you trying to create a three-way-mirror or mirror the one A three-way mirror. -- Andras Korn <korn at elan.rulez.org> Caesar si viveret, ad remum dareris. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html