RAID question

Hello!
I have this raid details

Code:

root@srv:~# mdadm --detail /dev/md0
/dev/md0:
        Version : 00.90
  Creation Time : Tue Jan 27 17:51:06 2009
     Raid Level : raid1
     Array Size : 234468544 (223.61 GiB 240.10 GB)
  Used Dev Size : 234468544 (223.61 GiB 240.10 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Fri Oct 15 10:32:13 2010
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : 3421f6a5:9e35a07f:cdefe9cd:f4dc5d4d
         Events : 0.3111324

    Number   Major   Minor   RaidDevice State
       0       8        1        0      active sync   /dev/sda1
       1       8       17        1      active sync   /dev/sdb1
root@srv:~# mdadm --detail /dev/md1
/dev/md1:
        Version : 00.90
  Creation Time : Tue Jan 27 17:51:11 2009
     Raid Level : raid1
     Array Size : 9727232 (9.28 GiB 9.96 GB)
  Used Dev Size : 9727232 (9.28 GiB 9.96 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 1
    Persistence : Superblock is persistent

    Update Time : Fri Oct 15 10:00:04 2010
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : 5de7ed81:944cb7f6:90adec78:f159b9de
         Events : 0.3430

    Number   Major   Minor   RaidDevice State
       0       8        2        0      active sync   /dev/sda2
       1       8       18        1      active sync   /dev/sdb2

If this RAID is correct? And why md1(for swap) checked as preferred minor?

thnks.

 

Looks ok to me.