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 (rdev->mddev->pers)
> err = -EBUSY;
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