Ok, so hearing all the excitement I ran a check on a multi-disk RAID-1. One of the RAID-1 disks failed out, maybe by coincidence but presumably due to the check. (I also have another disk in the array deliberately removed as a backup mechanism.) And of course there is a big mismatch count. Questions: will repair do the right thing for multidisk RAID-1, e.g. vote or something? Do I need a special version of mdadm to do this safely? What am I forgetting to ask? Jeff # cat /proc/mdstat Personalities : [raid1] md1 : active raid1 sdf1[0] sdb1[4] sdd1[6](F) sdc1[2] sde1[1] 488383936 blocks [6/4] [UUU_U_] # cat /sys/block/md1/md/mismatch_cnt 128 # cat /proc/version Linux version 2.6.17-2-amd64 (Debian 2.6.17-7) (waldi@xxxxxxxxxx) (gcc version 4.1.2 20060814 (prerelease) (Debian 4.1.1-11)) #1 SMP Thu Aug 24 16:13:57 UTC 2006 # dpkg -l | grep mdadm ii mdadm 1.9.0-4sarge1 Manage MD devices aka Linux Software Raid - 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