Bug#780941: mdadm.conf: missing explicit hotplug POLICY

[NeilBrown]

On Sun, 22 Mar 2015 10:54:27 +0100 Chris <email.bug at arcor.de> wrote:

> Package: mdadm
> 
> 
> Some lines need to be added to the installed mdadm.conf,
> to explicitly cover/enable the new hot-plug feature configuration:
> 
> 
> --------
> 
> 
> #### automatic hotplug action policy
> 
> ## allow automatic re-adding of removed devices when plugged back in
> ## (requires a write-intent bitmap)
> #
> POLICY domain=default action=re-add

I do not recommend this as a default setting (otherwise, it would be the
default).

You should only set the policy to "re-add" if you believe that path failure
is significantly more likely than media or mechanism failure.

i.e. the best choice depends on the particular hardware in use.

NeilBrown

> 
> 
> ## automatically use devices as new spares (enabling rebuild)
> #
> # POLICY domain=default action=spare
> 
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