How to troubleshoot degraded Raidz volume?

[bad_radiation]

We have:
OS Version: FreeBSD 8.2-RELEASE-p1
Platform: Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz
System Time: Tue Sep 6 23:29:28 PDT 2011
Uptime: 11:29PM up 2 days, 6:09, 0 users
Load Average: 0.00, 0.03, 0.12
FreeNAS Build: FreeNAS-8.0-RELEASE-amd64

with 3 x 2 TB caviar black drives in a raidz array called volume0 (all 3 drives are in the volume). All 3 drives are SATA mounted in the case (non-hot-swap). They are all new. We do have a spare drive, but we are unable to determine which, if any has failed.

On this volume we created 4 zfs datasets.

the GUI (Storage --> Active Volumes) now shows "Active Volumes 5" with all of them degraded. As a new user I can't post a screen shot, so here's the text version:

volume0 /mnt/volume0 47.6 GB (1%) 3.4 TB 3.4 TB DEGRADED
volume0 /mnt/volume0/virtual_machines 45.3 GB (1%) 3.4 TB 3.4 TB DEGRADED
volume0 /mnt/volume0/vm_backup 373.8 GB (9%) 3.4 TB 3.8 TB DEGRADED
volume0 /mnt/volume0/data_backup 29.6 GB (0%) 3.4 TB 3.4 TB DEGRADED
volume0 /mnt/volume0/general 31.2 GB (0%) 3.4 TB 3.4 TB DEGRADED

I have not been able to find out what's degraded about the array, and there appears to be no discussion of this anywhere.

Where do we start troubleshooting.

 

[pallfreeman]

Open a shell (either from the console or by ssh'ing in) and type "zpool status".

Doesn't help if you're expecting to be able to do this from the GUI, of course.