ZFS - hot spares : automatic or not?

John Hawkes-Reed hirez at libeljournal.com
Tue Jan 4 17:09:22 UTC 2011

On 04/01/2011 03:08, Dan Langille wrote:
> Hello folks,
> I'm trying to discover if ZFS under FreeBSD will automatically pull in a
> hot spare if one is required.
> This raised the issue back in March 2010, and refers to a PR opened in
> May 2009
> * http://lists.freebsd.org/pipermail/freebsd-fs/2010-March/007943.html
> * http://www.freebsd.org/cgi/query-pr.cgi?pr=134491
> In turn, the PR refers to this March 2010 post referring to using devd
> to accomplish this task.
> http://lists.freebsd.org/pipermail/freebsd-stable/2010-March/055686.html
> Does the above represent the the current state?
> I ask because I just ordered two more HDD to use as spares. Whether they
> sit on the shelf or in the box is open to discussion.

As far as our testing could discover, it's not automatic.

I wrote some Ugly Perl that's called by devd when it spots a drive-fail 
event, which seemed to DTRT when simulating a failure by pulling a drive.


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