Synchronous mdadm --add/--re-add operations

Synchronous mdadm --add/--re-add operations

[Andre Majorel]

How do I serialise mdadm --add/--re-add calls other than by
writing some shell to poll /proc/mdstat ? Is there a way to make
mdadm synchronous i.e., waiting until the operation completes or
fails instead of starting it in the background and returning.

-- 
André Majorel <URL:http://www.teaser.fr/~amajorel/>
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Re: Synchronous mdadm --add/--re-add operations

[Neil Brown]

On Thursday January 25, aym-xunil@teaser.fr wrote:
> How do I serialise mdadm --add/--re-add calls other than by
> writing some shell to poll /proc/mdstat ? Is there a way to make
> mdadm synchronous i.e., waiting until the operation completes or
> fails instead of starting it in the background and returning.

Something has to poll mdstat (or some /sys file).
In mdadm-2.6 where is a '-W' option which will wait for
resync/recovery to complete. So
  mdadm /dev/mdX -add /dev/thing
  mdadm -W /dev/mdX

might be what you want.

NeilBrown