Essentially yes, the entire pool dies. If you think of each mirror as an individual disk, you've just striped them together so the pool goes offline if any mirror fails, and each mirror can only guard against one half of the mirror failing.
If you want to guard against any two trays failing, you need to use some kind of dual parity protection. Either dual mirrors, or raid-z2. Given that you only have 8 LUN's, raid-z2 would seem to be the best option. If you really need to use mirroring for performance, is there any way you can split those trays to generate two LUN's each? That gives you 16 LUN's in total, enough for five dual mirror sets (using 3 LUN's each), plus one acting as a hot spare. This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
