I did a fresh install of FreeBSD 9.1-RC2 and imported an originally 4 disk zraid pool with only 3 disks attached in readonly mode (via zpool import -o readonly=on storage). On replacement of the missing disk via zpool replace storage ada1 the machine reboots instantly (with no messages in the system logs). I repeated the procedure five times with the same outcome. On importing the zpool without the readonly option, resilvering starts and works fine. How-To-Repeat: Mount a degraded raidz with '-o readonly=on' and than do 'zpool replace poolname newdisk'
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