Re: Auto replace disk

[NeilBrown <neilb@suse.com>]

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On Wed, Mar 08 2017, Gandalf Corvotempesta wrote:

> 2017-03-08 19:17 GMT+01:00 Wols Lists <antlists@youngman.org.uk>:
>> Do you mean you remove an old disk, and put a new blank disk in?
>
> Yes
>
>> If that's what you mean, then no, it's not possible. mdadm doesn't have
>> a clue about disks, what it sees is "block devices".
>
> Ok but mdadm.conf man page seems to say the opposite:
> https://linux.die.net/man/5/mdadm.conf
>
> "POLICY
> This is used to specify what automatic behavior is allowed on devices
> newly appearing in the system and provides a way of marking spares
> that can be moved to other arrays as well as the migration domains.
>
> action=include, re-add, spare, spare-same-slot, or force-spare
> auto= yes, no, or homehost.
>
> The action item determines the automatic behavior allowed for devices
> matching the path and type in the same line. If a device matches
> several lines with different actions then the most permissive will
> apply. The ordering of policy lines is irrelevant to the end result.
>
> includeallows adding a disk to an array if metadata on that disk
> matches that arrayre-addwill include the device in the array if it
> appears to be a current member or a member that was recently
> removedspareas above and additionally: if the device is bare it can
> become a spare if there is any array that it is a candidate for based
> on domains and metadata.spare-same-slotas above and additionally if
> given slot was used by an array that went degraded recently and the
> device plugged in has no metadata then it will be automatically added
> to that array (or it's container)force-spareas above and the disk will
> become a spare in remaining cases
> "

Clearly you have read the documentation - excellent!
What exactly are you asking?
Presumably you have tried something and it didn't work.  What (exactly)
did you try?

NeilBrown

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