On Wed, 15 Oct 2014 17:18:19 +0000 Michael Ryan <mryan@xxxxxxxxxxxxx> wrote: > > Is there any way to migrate an existing array created with mdadm v3.2.5 and using 1.1 metadata to use a bad block list? I'm assuming not as there wouldn't be space reserved for the list, but I need to ask. > > Thanks for your response! mdadm tends to leave a fair bit of unused space on devices so that things like a bad block list can easily be added. If you can stop the array, then do that and re-assemble with --update=bbl and you should get a bbl added to each device. If you cannot stop the array, but it has a bitmap, then you can, for each device: mdadm /dev/mdX --fail /dev/adevice mdadm /dev/mdX --remove /dev/adevice mdadm /dev/mdX --re-add --update=bbl /dev/adevice I think that should work. The "bblk" is a feature of the device, not of the whole array. So you can add it to each device. I haven't actually tested the above I think, so it might be safest to make an array with loop-back devices and experiment. NeilBrown
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