Hi,
you can start them by using "mdadm -As", that will start up the
container first and the other md devices after.
This will work without mdadm.conf, but it is always good to create a
proper mdadm.conf (mdadm -Es > /etc/mdadm.conf).
As for what it is, the container contains the disks (in your case sda
and sdb), the disks are not the container.
So you create a container first:
mdadm -CR /dev/md127 -e ddf -l container -n 2 /dev/sda /dev/sdb
Create a RAID1 device of 1 GB in there
mdadm -CR /dev/md0 -l 1 -n 2 /dev/md127 -z 1G
Create another RAID1 device of 50 MB in there
mdadm -CR /dev/md1 -l 1 -n 2 /dev/md127 -z 50M
(in this case both md devices are created on the same two disks).
If you have e.g. 5 disks you can create two separate RAID1 and RAID5
devices in the container:
mdadm -CR /dev/md127 -e ddf -l container -n 2 /dev/sda /dev/sdb /dev/sdc
/dev/sdd /dev/sde
mdadm -CR /dev/md0 -l 1 -n 2 /dev/md127
mdadm -CR /dev/md1 -l 5 -n 3 /dev/md127
Now, two disk are used fully for the RAID 1 device and three fully for
the RAID 5 devices, they both have their own set of disks.
Stopping them all:
mdadm -Ss
Starting them all:
mdadm -As
Hope this helps,
Albert
On 08/03/2012 03:05 AM, Wakko Warner wrote:
I've not used DDF or IMSM arrays much.
I understand that the devices (ie /dev/sda and /dev/sdb) are the containers.
I know that one can use mdadm -I on the devices and it will create mdXXX
(last I tried it was 127) and then will create mdXXX for each virtual disk
in the container and they will just work.
If I do mdadm -A /dev/mdXXX, how would one get the volumes inside started?
I tried mdadm -I /dev/mdXXX after mdadm -A. It created mdXXX where XXX is
-2 from the first one (it 127 being the container and 125 being there but
not in a state that works)
Does DDF/IMSM require mdadm.conf to work when using -A?
I'm not sure if I'm making myself very clear here or not.
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