When a new system CentOS-4.4 is built the swap partition is always reversed... Note md3 below, the raidtab is OK, I have tried various raid commands to correct. swapoff -a raidstop /dev/md3 mkraid /dev/md3 --really-force swapon -a And then I get a proper ourput for /proc/mdstat, but when I reboot /proc/mdstat again reads as below, with md3 [0] [1] reversed. [root]# cat /proc/mdstat Personalities : [raid1] md3 : active raid1 hda3[0] hdc3[1] 1000320 blocks [2/2] [UU] md1 : active raid1 hdc1[1] hda1[0] 1953408 blocks [2/2] [UU] md2 : active raid1 hdc2[1] hda2[0] 1953408 blocks [2/2] [UU] md5 : active raid1 hdc5[1] hda5[0] 1953408 blocks [2/2] [UU] md6 : active raid1 hdc6[1] hda6[0] 71295232 blocks [2/2] [UU] unused devices: <none>