On Tue, May 19, 2009 at 2:16 PM, Paul B. Henson <hen...@acm.org> wrote:
>
> I was checking with Sun support regarding this issue, and they say "The CR
> currently has a high priority and the fix is understood. However, there is
> no eta, workaround, nor IDR."
>
> If it's a high priority, and it's known how to fix it, I was curious as to
> why has there been no progress? As I understand, if a failure of the log
> device occurs while the pool is active, it automatically switches back to
> an embedded pool log. It seems removal would be as simple as following the
> failure path to an embedded log, and then update the pool metadata to
> remove the log device. Is it more complicated than that? We're about to do
> some testing with slogs, and it would make me a lot more comfortable to
> deploy one in production if there was a backout plan :)...
>

A rather interesting putback just happened...

http://hg.genunix.org/onnv-gate.hg/rev/cc5b64682e64

6803605 <http://bugs.opensolaris.org/view_bug.do?bug_id=6803605> should be
able to offline log devices
6726045 
<http://bugs.opensolaris.org/view_bug.do?bug_id=6726045>vdev_deflate_ratio
is not set when offlining a log device
6599442 <http://bugs.opensolaris.org/view_bug.do?bug_id=6599442> zpool
import has faults in the display

I love comments that tell you what is really going on...

    8.75 <http://hg.genunix.org/onnv-gate.hg/rev/cc5b64682e64#l8.75>            
/*
    8.76 <http://hg.genunix.org/onnv-gate.hg/rev/cc5b64682e64#l8.76>
                 * If this device has the only valid copy of some data,
    8.77 <http://hg.genunix.org/onnv-gate.hg/rev/cc5b64682e64#l8.77>
-                * don't allow it to be offlined.
    8.78 <http://hg.genunix.org/onnv-gate.hg/rev/cc5b64682e64#l8.78>
+                * don't allow it to be offlined. Log devices are always
    8.79 <http://hg.genunix.org/onnv-gate.hg/rev/cc5b64682e64#l8.79>
+                * expendable.
    8.80 <http://hg.genunix.org/onnv-gate.hg/rev/cc5b64682e64#l8.80>            
 */


For some reason, the CR's listed above are not available through
bugs.opensolaris.org.  However, at least 6833605 is available through
sunsolve if you have a support contract.

-- 
Mike Gerdts
http://mgerdts.blogspot.com/
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