gmirror: lost disk, HOWTO proceed?

Hi -

I do run a mirror made from /dev/da4 and /dev/da6.

Two hours ago smartd started to throw the following error messages:
Code:
smartd[787]: Device: /dev/ad6, 1 Currently unreadable (pending) sectors
smartd[787]: Device: /dev/ad6, 1 Offline uncorrectable sectors

Well, and gmirror tells me:
Code:
me> gmirror status
      Name    Status  Components
mirror/gm0  DEGRADED  ad4

Code:
me> gmirror list
Geom name: gm0
State: DEGRADED
Components: 2
Balance: round-robin
Slice: 4096
Flags: NONE
GenID: 1
SyncID: 1
ID: 1798641043
Providers:
1. Name: mirror/gm0
   Mediasize: 500107861504 (466G)
   Sectorsize: 512
   Mode: r6w6e7
Consumers:
1. Name: ad4
   Mediasize: 500107862016 (466G)
   Sectorsize: 512
   Mode: r1w1e1
   State: ACTIVE
   Priority: 0
   Flags: DIRTY
   GenID: 1
   SyncID: 1
   ID: 674613560

Hmm, consumer 2 is gone :-(

Then I did try to re-insert /dev/da6:
Code:
me> me> gmirror insert gm0 /dev/ad6
gmirror: Not all disks connected.

Even a ...
Code:
me> gmirror rebuild gm0 /dev/ad6
gmirror: No such provider: /dev/ad6.
... didn't help me.

I do not have physical access to that machine (re-located).

What would you propose to do next? And, I really do appreciate every hint to literature, FAQs, and alike.

Thanks.
 
I forgot to show:

me> grep -i GEOM /var/log/messages
Mar 16 03:01:37 <kern.crit> enfer-du-nord kernel: GEOM_MIRROR: Request failed (error=5). ad6[READ(offset=99604004352, length=131072)]
Mar 16 03:01:37 <kern.crit> enfer-du-nord kernel: GEOM_MIRROR: Device gm0: provider ad6 disconnected.
 
uisge said:
What would you propose to do next?
And, I really do appreciate every hint to literature, FAQs, and alike.

Ok, I did manage to re-add that disk into the raid, and it is currently rebuilding.

JFTR:
Code:
me> gmirror forget gm0

me> gmirror status
      Name    Status  Components
mirror/gm0  COMPLETE  ad4

me> gmirror remove gm0 /dev/ad6
gmirror: No such provider: ad6.

me> gmirror insert gm0 /dev/ad6

me> gmirror status
      Name    Status  Components
mirror/gm0  DEGRADED  ad4
                      ad6 (0%)

Well, I'll see in a couple of hours/days if that disk will fail again.
 
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