On Sun, 1 Apr 2012, Florin Iucha wrote: > It seems that you have two RAID devices, md0 and md1, each supported by > one partition on sda. There is no other physical disk present, so the > arrays are in degraded state. They 'work', but only one disk is > present. You have no protection. You have no second drive. If you are right, that means the message I sent back in October about how to do the RAID1 did not work for me. It would also mean that the RAID1 that Brian set up for me back in November 2008 has also not been working at all for the past 3+ years (see below). I really need to do this right next time. I'm about to setup another one of these software RAID1s on Ubuntu and I want to be sure it is done right. Mike /dev/md0: Version : 00.90 Creation Time : Sat Nov 8 15:51:28 2008 Raid Level : raid1 Array Size : 497856 (486.27 MiB 509.80 MB) Used Dev Size : 497856 (486.27 MiB 509.80 MB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Sun Apr 1 15:57:08 2012 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 UUID : e73853db:6d5e7f50:84e30963:12d268d1 Events : 0.1165 Number Major Minor RaidDevice State 0 8 1 0 active sync /dev/sda1 1 8 17 1 active sync /dev/sdb1 /dev/md1: Version : 00.90 Creation Time : Sat Nov 8 15:52:34 2008 Raid Level : raid1 Array Size : 241641600 (230.45 GiB 247.44 GB) Used Dev Size : 241641600 (230.45 GiB 247.44 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 1 Persistence : Superblock is persistent Update Time : Sun Apr 1 15:57:42 2012 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 UUID : 9085d832:e894c575:4aa0e109:4d0f2d0c Events : 0.14258807 Number Major Minor RaidDevice State 0 8 3 0 active sync /dev/sda3 1 8 19 1 active sync /dev/sdb3