[root@mikamow root]# tail /proc/mdstat Personalities : [raid1] read_ahead 1024 sectors md1 : active raid1 hdd3[1] 77015488 blocks [2/1] [_U] md0 : active raid1 hda1[0] hdd1[1] 104320 blocks [2/2] [UU] unused devices: [root@mikamow root]# more /proc/mdstat Personalities : [raid1] read_ahead 1024 sectors md1 : active raid1 hdd3[1] 77015488 blocks [2/1] [_U] md0 : active raid1 hda1[0] hdd1[1] 104320 blocks [2/2] [UU] unused devices: [root@mikamow root]# df -k Filesystem 1k-blocks Used Available Use% Mounted on /dev/md1 75806248 23612072 48343404 33% / /dev/md0 101018 9108 86694 10% /boot none 511580 0 511580 0% /dev/shm You have new mail in /var/spool/mail/root [root@mikamow root]# mdadm --detail /dev/md1 /dev/md1: Version : 00.90.00 Creation Time : Wed May 7 08:53:23 2003 Raid Level : raid1 Array Size : 77015488 (73.45 GiB 78.86 GB) Device Size : 77015488 (73.45 GiB 78.86 GB) Raid Devices : 2 Total Devices : 1 Preferred Minor : 1 Persistence : Superblock is persistent Update Time : Thu Jul 5 12:10:34 2007 State : dirty, degraded Active Devices : 1 Working Devices : 1 Failed Devices : 0 Spare Devices : 0 UUID : 2c96f407:6c89c9a2:771b9191:e3795b84 Events : 0.290 Number Major Minor RaidDevice State 0 0 0 0 faulty removed 1 22 67 1 active sync /dev/hdd3 You have new mail in /var/spool/mail/root [root@mikamow root]# mdadm --detail /dev/md0 /dev/md0: Version : 00.90.00 Creation Time : Wed May 7 09:08:57 2003 Raid Level : raid1 Array Size : 104320 (101.88 MiB 106.82 MB) Device Size : 104320 (101.88 MiB 106.82 MB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Thu Jul 5 12:10:34 2007 State : dirty Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 UUID : 8afcef73:6b0b8596:4ca6dd7a:b8b5c09f Events : 0.295 Number Major Minor RaidDevice State 0 3 1 0 active sync /dev/hda1 1 22 65 1 active sync /dev/hdd1 [root@mikamow root]# lsraid -a /dev/md1 [dev 9, 1] /dev/md1 2C96F407.6C89C9A2.771B9191.E3795B84 online [dev ?, ?] (unknown) 00000000.00000000.00000000.00000000 missing [dev 22, 67] /dev/hdd3 2C96F407.6C89C9A2.771B9191.E3795B84 good [root@mikamow root]# lsraid -a /dev/md0 [dev 9, 0] /dev/md0 8AFCEF73.6B0B8596.4CA6DD7A.B8B5C09F online [dev 3, 1] /dev/hda1 8AFCEF73.6B0B8596.4CA6DD7A.B8B5C09F good [dev 22, 65] /dev/hdd1 8AFCEF73.6B0B8596.4CA6DD7A.B8B5C09F good [root@mikamow root]# more /etc/raidtab raiddev /dev/md1 raid-level 1 nr-raid-disks 2 chunk-size 64k persistent-superblock 1 nr-spare-disks 0 device /dev/hda3 raid-disk 0 device /dev/hdd3 raid-disk 1 raiddev /dev/md0 raid-level 1 nr-raid-disks 2 chunk-size 64k persistent-superblock 1 nr-spare-disks 0 device /dev/hda1 raid-disk 0 device /dev/hdd1 raid-disk 1 [root@mikamow root]# ls -al /dev/hdd3 brw-rw---- 1 root disk 22, 67 Apr 11 2002 /dev/hdd3 [root@mikamow root]# ls -al /dev/hda3 brw-rw---- 1 root disk 3, 3 Apr 11 2002 /dev/hda3 [root@mikamow root]# mdadm --query /dev/md1 /dev/md1: 73.45GiB raid1 2 devices, 0 spares. Use mdadm --detail for more detail. /dev/md1: No md super block found, not an md component. [root@mikamow root]# mdadm --detail /dev/md1 /dev/md1: Version : 00.90.00 Creation Time : Wed May 7 08:53:23 2003 Raid Level : raid1 Array Size : 77015488 (73.45 GiB 78.86 GB) Device Size : 77015488 (73.45 GiB 78.86 GB) Raid Devices : 2 Total Devices : 1 Preferred Minor : 1 Persistence : Superblock is persistent Update Time : Thu Jul 5 12:10:34 2007 State : dirty, degraded Active Devices : 1 Working Devices : 1 Failed Devices : 0 Spare Devices : 0 UUID : 2c96f407:6c89c9a2:771b9191:e3795b84 Events : 0.290 Number Major Minor RaidDevice State 0 0 0 0 faulty removed 1 22 67 1 active sync /dev/hdd3 [root@mikamow root]# mdadm --examine /dev/hdd3 /dev/hdd3: Magic : a92b4efc Version : 00.90.00 UUID : 2c96f407:6c89c9a2:771b9191:e3795b84 Creation Time : Wed May 7 08:53:23 2003 Raid Level : raid1 Device Size : 77015488 (73.45 GiB 78.86 GB) Raid Devices : 2 Total Devices : 1 Preferred Minor : 1 Update Time : Thu Jul 5 12:10:34 2007 State : dirty Active Devices : 1 Working Devices : 1 Failed Devices : 0 Spare Devices : 0 Checksum : 26bf3f95 - correct Events : 0.290 Number Major Minor RaidDevice State this 1 22 67 1 active sync /dev/hdd3 0 0 0 0 0 faulty removed 1 1 22 67 1 active sync /dev/hdd3 [root@mikamow root]# mdadm --examine /dev/hda3 /dev/hda3: Magic : a92b4efc Version : 00.90.00 UUID : 2c96f407:6c89c9a2:771b9191:e3795b84 Creation Time : Wed May 7 08:53:23 2003 Raid Level : raid1 Device Size : 77015488 (73.45 GiB 78.86 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 1 Update Time : Sun Jan 9 15:02:35 2005 State : dirty Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Checksum : 2213b4e8 - correct Events : 0.131 Number Major Minor RaidDevice State this 0 3 3 0 active sync /dev/hda3 0 0 3 3 0 active sync /dev/hda3 1 1 22 67 1 active sync /dev/hdd3