bowser home # fdisk -l /dev/sda Disk /dev/sda: 203.9 GB, 203928109056 bytes 255 heads, 63 sectors/track, 24792 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x06580657 Device Boot Start End Blocks Id System /dev/sda1 * 1 17 136521 fd Linux raid autodetect /dev/sda2 18 24318 195197782+ fd Linux raid autodetect bowser home # fdisk -l /dev/sdb Disk /dev/sdb: 300.0 GB, 300069052416 bytes 255 heads, 63 sectors/track, 36481 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x00000001 Device Boot Start End Blocks Id System /dev/sdb1 * 1 17 136521 83 Linux /dev/sdb2 18 261 1959930 82 Linux swap / Solaris /dev/sdb3 262 12159 95570685 83 Linux /dev/sdb4 12160 36460 195197782+ fd Linux raid autodetect bowser home # fdisk -l /dev/sdc Disk /dev/sdc: 200.0 GB, 200049647616 bytes 255 heads, 63 sectors/track, 24321 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x62c79e19 Device Boot Start End Blocks Id System /dev/sdc1 * 1 17 136521 fd Linux raid autodetect /dev/sdc2 18 24318 195197782+ fd Linux raid autodetect bowser home # fdisk -l /dev/sdd Disk /dev/sdd: 200.0 GB, 200049647616 bytes 255 heads, 63 sectors/track, 24321 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x62c79e1a Device Boot Start End Blocks Id System /dev/sdd1 * 1 17 136521 fd Linux raid autodetect /dev/sdd2 18 24318 195197782+ fd Linux raid autodetect bowser home # mdadm --create /dev/md2 --level=5 --raid-devices=4 /dev/sda2 /dev/sdb4 /dev/sdc2 /dev/sdd2 mdadm: /dev/sda2 appears to contain an ext2fs file system size=197623168K mtime=Tue Dec 4 02:27:37 2007 mdadm: /dev/sda2 appears to be part of a raid array: level=raid1 devices=4 ctime=Tue Dec 4 02:30:14 2007 mdadm: /dev/sdb4 appears to contain an ext2fs file system size=197623168K mtime=Tue Dec 4 02:27:37 2007 mdadm: /dev/sdb4 appears to be part of a raid array: level=raid1 devices=4 ctime=Tue Dec 4 02:30:14 2007 mdadm: /dev/sdc2 appears to contain an ext2fs file system size=197623168K mtime=Tue Dec 4 02:27:37 2007 mdadm: /dev/sdc2 appears to be part of a raid array: level=raid1 devices=4 ctime=Tue Dec 4 02:30:14 2007 mdadm: /dev/sdd2 appears to contain an ext2fs file system size=197623168K mtime=Tue Dec 4 02:27:37 2007 mdadm: /dev/sdd2 appears to be part of a raid array: level=raid1 devices=4 ctime=Tue Dec 4 02:30:14 2007 mdadm: largest drive (/dev/sdb4) exceed size (754944K) by more than 1% Continue creating array? y mdadm: array /dev/md2 started. bowser home # cat /proc/mdstat Personalities : [linear] [raid0] [raid1] [raid6] [raid5] [raid4] [multipath] md1 : active raid1 sdd1[2] sdc1[1] sda1[0] 136448 blocks [3/3] [UUU] md2 : active raid5 sdd2[3] sdc2[2] sdb4[1] sda2[0] 2264832 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU] unused devices: