I have two NAS enclosures the oldest, an EX4 has four 2TB WD RED drives running under RAID 5. My second is an EX4100 with four 8TB WD RED drives again running under RAID 5.
The EX4 was purchased 19th July 2015 and I had the power schedule set to power up at 6am and shut down midnight.
Under this regime I have had several disk failures. Drive 1 in Bay 1 failed soon after purchase (I don’t have a record of the date) but this was replaced under warrantee. Drive 4 Bay 4 failed and was replaced under warrantee on 8th March 2016. The replaced Drive 1 Bay 1 failed and was replaced a second time on 12th May 2016.
I have just had a red led warning on Drive 1 Bay 1 and I shut the system down. I powered it up the following day and ran the short diagnostic test which completed successfully. The long test was running for many hours and seemed to stall with a sliver of the bar remaining. I chose to cancel the test. At this moment it is powered but the blue led’s are flashing continously but the red warning is no longer showing.
Are these failures a result of the prolonged run time that I have set on the power schedule?