Has anyone been able to rebuild an Intel fakeraid?

[wardhj]

I have an Intel (P55 chipset) fakeraid.

I can create a raid1, simulate a disk failure by unplugging a disk, and have the raid1 survive in degraded state.

However, I have not been able to rebuild. Has anyone been able to do this?

Is there official documentation for this? Where?

[Rubberman]

Have you tried visiting the Intel web site? In any case, sorry but I haven't tried this, so I am talking out of my hat...

[wardhj]

I was able to puzzle out the answer for myself. When you insert the new disk, it gets added (inexplicably) to some RAID array. You can find the array using "ls /dev/md*" together with "mdadm --detail /dev/md<whatever>". Then you have to remove the new disk from said array using "mdadm --manage /dev/md<whatever> --remove /dev/sd<whatever>" and add it to the working array's parent using "mdadm --manage /dev/md<parent> --add /dev/sd<whatever". You have to do this even if /dev/md<parent> and /dev/md<whatever> are the same array. I think I'm probably working around some Fedora/Linux bug.

I don't know yet whether you have to format the disk or whether it gets formatted automatically. I was going to test this this afternoon.

A Fedora minimal install is quick, and it gives you enough tools to experiment with (mdadm, fdisk, etc).