Re: How does one assemble a DDF or IMSM array?
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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/md127Now, 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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