Critical Alert

[Ico747]

I am relatively new to FreeNas. For rirst time I have Alert: CRITICAL: The volume volume_A (ZFS) state is ONLINE: One or more devices has experienced an unrecoverable error. An attempt was made to correct the error. Applications are unaffected.
In View Disk I see my my 2 disks RAID 1 (mirror). What I should do to find out what is wrong and eventually to repair?

 

[hugovsky]

Seems you have an error in your pool. Please post all info about your system.

 

[danb35]

As hugovsky said, we'll need some details about your system. The forum rules (linked at the top of the page) give the full story, but here are some of what we'd be looking for:

• FreeNAS version
• Hardware configuration, including motherboard, CPU, type and amount of RAM, types of disks, and disk controller (if any)
• Screen shot of the volume status screen from the web GUI, and/or output of 'zpool status' from the command line

 

[Ico747]

@hugovsky
@danb35
Tank you very much for your very quick reaction!

In meanwhile using "zpool clear volume" there is no more Alert (green light). Should I do something more? Perhaps scrub?
[root@nas] ~# zpool status
pool: freenas-boot
state: ONLINE
scan: scrub repaired 0 in 0h2m with 0 errors on Sat Apr 11 03:47:15 2015
config:

NAME STATE READ WRITE CKSUM
freenas-boot ONLINE 0 0 0
gptid/09332b3e-8b5c-11e4-aa1b-94de80cef1f5 ONLINE 0 0 0

errors: No known data errors

pool: volume_A
state: ONLINE
scan: resilvered 230M in 0h0m with 0 errors on Wed Apr 15 17:15:50 2015
config:

NAME STATE READ WRITE CKSUM
volume_A ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
gptid/6bdd4c5c-147a-11e1-9175-f46d046472ed ONLINE 0 0 0
gptid/6c1d329e-147a-11e1-9175-f46d046472ed ONLINE 0 0 0

 

[danb35]

'zpool clear volume' will clear the error message, but it won't correct any actual error conditions. A scrub would probably be a good idea. You've set up regular long and short SMART tests, and configured the email for the SMART service, right? That should notify you if there's a problem with one of your disks.

 

[Ico747]

I have set the disks SMART enable. Just now I enabled SMART service. Immediately have one error reported:
Device: /dev/ada1, Temperature 38 Celsius reached critical limit of 1 Celsius (Min/Max ??/38)
Device: /dev/ada0, Temperature 37 Celsius reached critical limit of 1 Celsius (Min/Max ??/37)

 

[danb35]

You'll want to set the SMART service temperature thresholds (use the wrench icon just to the right of the on/off toggle). I set my "critical" to 40. Make sure to schedule tests too--enabling the service doesn't schedule the tests.

 

[Ico747]

Tank you very much! Now I understand. I will set critical to 40! Could you advice about Difference and Information or simple disable them?

 

[danb35]

I don't have either of those enabled. http://doc.freenas.org/9.3/freenas_services.html#s-m-a-r-t describes them if you need more information.