Re: Re: How to use replacement?

[majianpeng <majianpeng@gmail.com>]

>On Mon, 4 Jun 2012 09:53:21 +0800 majianpeng <majianpeng@gmail.com> 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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majianpeng