More information, from dmesg:- md: linear personality registered for level -1 md: raid0 personality registered for level 0 md: raid1 personality registered for level 1 device-mapper: ioctl: 4.12.0-ioctl (2007-10-02) initialised: dm-devel@xxxxxxxxxx TCP cubic registered NET: Registered protocol family 1 NET: Registered protocol family 17 md: Autodetecting RAID arrays. md: Scanned 8 and added 8 devices. md: autorun ... md: considering sdb4 ... md: adding sdb4 ... md: sdb3 has different UUID to sdb4 md: sdb2 has different UUID to sdb4 md: sdb1 has different UUID to sdb4 md: sda4 has different UUID to sdb4 md: sda3 has different UUID to sdb4 md: sda2 has different UUID to sdb4 md: sda1 has different UUID to sdb4 md: created md4 md: bind<sdb4> md: running: <sdb4> raid1: raid set md4 active with 1 out of 2 mirrors raid1 not hw raidable, needs two working disks. md: considering sdb3 ... md: adding sdb3 ... md: sdb2 has different UUID to sdb3 md: sdb1 has different UUID to sdb3 md: sda4 has different UUID to sdb3 md: adding sda3 ... md: sda2 has different UUID to sdb3 md: sda1 has different UUID to sdb3 md: created md3 md: bind<sda3> md: bind<sdb3> md: running: <sdb3><sda3> raid1: raid set md3 active with 2 out of 2 mirrors raid1 using hardware RAID 0x00000001 md: considering sdb2 ... md: adding sdb2 ... md: sdb1 has different UUID to sdb2 md: sda4 has different UUID to sdb2 md: adding sda2 ... md: sda1 has different UUID to sdb2 md: created md1 md: bind<sda2> md: bind<sdb2> md: running: <sdb2><sda2> raid1: raid set md1 active with 2 out of 2 mirrors raid1 using hardware RAID 0x00000001 md: considering sdb1 ... md: adding sdb1 ... md: sda4 has different UUID to sdb1 md: adding sda1 ... md: created md0 md: bind<sda1> md: bind<sdb1> md: running: <sdb1><sda1> raid1: raid set md0 active with 2 out of 2 mirrors raid1 using hardware RAID 0x00000001 md: considering sda4 ... md: adding sda4 ... md: created md2 md: bind<sda4> md: running: <sda4> raid1: raid set md2 active with 1 out of 2 mirrors raid1 not hw raidable, needs two working disks. md: ... autorun DONE. -- Chris Green
