I'm not entirely sure.
I think we do have 1 max 2 power outages a year. In all cases my UPS did the job and powered the NAS off just in time.
re. errors:
I've been seeing these errors for quite a while and they were one of the two reasons behind disk replacement.
The second one was slowly increasing number of bad sectors reported by SMART test for both
ada3 &
ada5
Here's a rough timeline:
Feb 12th:
Code:
Current alerts:
* Device: /dev/ada5, 8 Currently unreadable (pending) sectors
* Device: /dev/ada5, 8 Offline uncorrectable sectors
Apr 6th:
Code:
Current alerts:
* Device: /dev/ada0, 8 Currently unreadable (pending) sectors.
* Device: /dev/ada0, 8 Offline uncorrectable sectors.
* Device: /dev/ada3, 8 Currently unreadable (pending) sectors.
* Device: /dev/ada3, 8 Offline uncorrectable sectors.
* Device: /dev/ada5, ATA error count increased from 55 to 60.
* Device: /dev/ada5, 8 Currently unreadable (pending) sectors.
* Device: /dev/ada5, 8 Offline uncorrectable sectors.
* Device: /dev/ada6, 8 Currently unreadable (pending) sectors.
* Device: /dev/ada6, 8 Offline uncorrectable sectors.
Apr 26th:
Code:
Current alerts:
* Device: /dev/ada5, ATA error count increased from 55 to 60.
* Device: /dev/ada0, 8 Currently unreadable (pending) sectors.
* Device: /dev/ada0, 8 Offline uncorrectable sectors.
* Device: /dev/ada3, 8 Currently unreadable (pending) sectors.
* Device: /dev/ada3, 8 Offline uncorrectable sectors.
* Device: /dev/ada5, 8 Currently unreadable (pending) sectors.
* Device: /dev/ada5, 8 Offline uncorrectable sectors.
* Device: /dev/ada5, ATA error count increased from 65 to 70.
* Device: /dev/ada5, Self-Test Log error count increased from 8 to 9.
* Device: /dev/ada6, 8 Currently unreadable (pending) sectors.
* Device: /dev/ada6, 8 Offline uncorrectable sectors.
May 3rd:
Code:
New alerts:
* Device: /dev/ada5, Self-Test Log error count increased from 9 to 10.
Current alerts:
* Device: /dev/ada5, ATA error count increased from 65 to 70.
* Device: /dev/ada5, Self-Test Log error count increased from 8 to 9.
* Device: /dev/ada5, ATA error count increased from 70 to 75.
* Device: /dev/ada5, ATA error count increased from 75 to 80.
* Device: /dev/ada3, ATA error count increased from 19 to 20.
* Device: /dev/ada5, ATA error count increased from 80 to 85.
* Device: /dev/ada5, 8 Currently unreadable (pending) sectors.
* Device: /dev/ada5, 8 Offline uncorrectable sectors.
* Device: /dev/ada5, ATA error count increased from 85 to 90.
May 8th (after replacing ada5 and before replacing ada3)
Code:
Current alerts:
* Device: /dev/ada3, ATA error count increased from 20 to 22.
My plan is to replace remaining 6x4TB drives in a span of 3 to 6 months (as I can't easily afford more than 2 new drives a month :) )
When do you think I should be getting worried about a bad sectors?