From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: How to use replacement?
Date: Mon, 4 Jun 2012 12:11:36 +1000
Message-ID: <20120604121136.0edfd95e@notabene.brown>
References: <201206040953190009422@gmail.com>
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To: majianpeng <majianpeng@gmail.com>
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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
  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


> >		if (rdev->mddev->pers)
> >			err =3D -EBUSY;
> 	=09
>=20
>=20
> --------------
> majianpeng

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