>On Mon, 4 Jun 2012 09:53:21 +0800 majianpeng <majianpeng@xxxxxxxxx> wrote:
>
>> Hi:
>> At present, md is supporting replacement.
>> In function: state_store()
>> > } else if (cmd_match(buf, "replacement")) {
>> > /* Can only set a device as a replacement when array has not
>> > * yet been started. Once running, replacement is automatic
>> > * from spares, or by assigning 'slot'.
>> > */
>> I can using spare disk.But how to use slot?
>
>If you want to ensure that a particular device becomes a replacement for a
>particular other device, then
> cd /sys/block/mdX/md
> echo frozen > sync_action
> echo NN:MM > new_dev # where NN is major and MM is minor of new device
If the array had a persistent superblock, the operation returned error.
The message like:
[ 262.934070] md: sde does not have a valid v1.2 superblock, not importing!
How can do it ?
> echo want_replacement > rdSS/state # where SS is slot number of device to
> # replace
> echo SS > dev-YYY/slot # where YYY is the kernel name of the newly added
> # device
> echo idle > sync_action
>
>should do it, but I haven't tested recently.
>
>NeilBrown
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