How to figure out why I’ve got SMART Errors

[Bostjan]

I have freshly installed FreeNAS with freshly created zpool (mirrors). In about a week of usage I’ve got these messages:
CRITICAL: Device: /dev/ada4, Read SMART Error Log Failed
CRITICAL: Device: /dev/ada5, Read SMART Self-Test Log Failed
CRITICAL: Device: /dev/ada2, Read SMART Self-Test Log Failed
CRITICAL: Device: /dev/ada2, Read SMART Error Log Failed
CRITICAL: Device: /dev/ada3, Read SMART Self-Test Log Failed
CRITICAL: Device: /dev/ada3, Read SMART Error Log Failed

Three disks are less than 6 months old, two are about 1 year old and one disk is more than 2 years old.

What could be wrong? Where to check that?

Thanks for help.

 

[traderjay]

What does it say in shell when you input the following:

Code:

smartctl -A /dev/adaX

Replace X with the drive number 4, 5, 2, 3