Will and several other people are correct. I had forgotten that ZFS does a funky form of concatenation when you use different size vdevs. I tend to ignore this case, because it's kinda useless (I know, I know, there's people who use it, but, really... <wink>)
Basically, it will stripe across vdevs as it can. So, if you have a zpool like this: 2GB vdev 3GB vdev 4GB vdev ZFS will have a 3-wide stripe across the first 2GB of all devices, then a 2-wide stripe across the next 1GB of the two larger devices, then finally a single stripe (aka no stripe) in the 1GB left in the largest one (in this example). So you do get the full 9GB of space. Naturally, this produces really weird performance curves for (random) data access. OK, maybe weird isn't the right word, but... -- Erik Trimble Java System Support Mailstop: usca22-123 Phone: x17195 Santa Clara, CA Timezone: US/Pacific (GMT-0800) _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
