Software RAID 1 and mdadm
- From: js <noone@xxxxxxxxx>
- Date: Sun, 04 Dec 2005 11:33:32 +1100
During boot up, I get the following messages:
mdadm: only specify super-minor once, super-minor=4 ignored.
mdadm: only specify super-minor once, super-minor=1 ignored.
mdadm: only specify super-minor once, super-minor=6 ignored.
mdadm: only specify super-minor once, super-minor=0 ignored.
mdadm: only specify super-minor once, super-minor=3 ignored.
mdadm: only specify super-minor once, super-minor=5 ignored.
mdadm: only specify super-minor once, super-minor=2 ignored.
I figured out that these messages are also generated by:
mdadm --examine --scan
This is what I have in mdadm.conf, which was created
during installation of fedora core 3:
# mdadm.conf written out by anaconda
DEVICE partitions
MAILADDR root
ARRAY /dev/md4 super-minor=4
ARRAY /dev/md1 super-minor=1
ARRAY /dev/md6 super-minor=6
ARRAY /dev/md0 super-minor=0
ARRAY /dev/md3 super-minor=3
ARRAY /dev/md5 super-minor=5
ARRAY /dev/md2 super-minor=2
Is it right that the warning messages above were a result
of specify the "super-minor" parameter in mdadm.conf file ...
given that the minor number could be determined from /dev/mdX,
where X is the minor number according to mdadm.conf:
super-minor=
The value is an integer which indicates the minor number
that was stored in the superblock when the array was cre-
ated. When an array is created as /dev/mdX, then the minor
number X is stored.
Also, can the output of 'mdmad --detail --scan' replace
the contents in mdadm.conf ? Here's what I get with 'mdadm --detail --scan':
ARRAY /dev/md4 level=raid1 num-devices=2
UUID=66fc43a3:005cef14:5d5a4e61:f27de595
devices=/dev/sda1,/dev/sdb1
ARRAY /dev/md1 level=raid1 num-devices=2
UUID=56faff4d:d6cc8d07:009e9fb8:2032271e
devices=/dev/sda2,/dev/sdb2
ARRAY /dev/md5 level=raid1 num-devices=2
UUID=136c2810:f5586756:405b432e:f13c2d73
devices=/dev/sda3,/dev/sdb3
ARRAY /dev/md6 level=raid1 num-devices=2
UUID=ced64724:00a0a246:4d5d5da8:8fc7ee1f
devices=/dev/sda5,/dev/sdb5
ARRAY /dev/md2 level=raid1 num-devices=2
UUID=4da9cfbc:544d48a5:11a4edbd:85c644f5
devices=/dev/sda7,/dev/sdb7
ARRAY /dev/md3 level=raid1 num-devices=2
UUID=d4daf629:6805ac25:0c5e5630:af8e2e4d
devices=/dev/sda8,/dev/sdb8
ARRAY /dev/md0 level=raid1 num-devices=2
UUID=5ea2f756:59e64953:eb889eb4:cc050a15
devices=/dev/sda6,/dev/sdb6
I like the output better above, since it exactly says
which partitions are part of the raid 1 array.
.
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