I have dabbed a bit with the standard raid1/raid5 sets and am just
diving into this whole ddf container stuff,
and see how I can fail, remove and add a disk.
Here is what I have, Fedora 14, five 1GB Sata disks (they are virtual
disks under VirtualBox but it all seems
to work well under the standard raid stuff. For mdadm I am using the
latest git version, with version nr 3.1.4.
I created a ddf container:
mdadm -C /dev/md/container -e ddf -l container -n 5 /dev/sd[b-f]
I now create a raid 5 set in this container:
mdadm -C /dev/md1 -l raid5 -n 5 /dev/md/container
This all seems to work, I also noticed that after a stop and start of
both the container and the raidset,
the container has been renamed to /dev/md/ddf0 which points to /dev/md127.
I now fail one disk in the raidset:
mdadm -f /dev/md1 /dev/sdc
I noticed that it is removed from the md1 raidset, and marked
online,failed in the container. So far so
good. When I now stop the md1 array and start it again, it will be back
again with all 5 disks, clean, no failure
although in the container the disk is marked failed. I then remove it
from the container:
mdadm -r /dev/md127 /dev/sdc
I clean the disk with mdadm --zero-superblock /dev/sdc and add it again.
But how do I add this disk again to the md1 raidset?
I see in the container that /dev/sdc is back, with status
"active/Online, Failed" and a new disk is added
with no device file and status "Global-Spare/Online".
I am confused now.
So my question: how do I replace a faulty disk in a raidset, which is in
a ddf container?
Thanks and bare with me, I am relatively new to all this.
Albert
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