PR4100 - Drive replacement issues


#1

I faced an issue with one of my PR4100s, that I had not experienced before.
After a necessary Hard reboot, due to the NAS spending a few days in ‘powering down mode’ with no hope of actually powering down. The Drive 3 LED went red and the Dashboard informed me that the drive was Bad.
I had a replacement HD Red 8TB at hand and substituted it with the faulty one.

Once the System started to rebuild the RAID 5, it stopped after ten minutes and this time showed Drive 1 and 2 as Bad with the corresponding red LED drive lights.

This of course freaked me out, as now I had in effect three Bad drives! So I replaced the original ‘Bad’ Drive 3 and rebooted. This time Drive 1 and 2 were OK and three was Bad, as expected. Am currently transferring all data to another NAS as quickly as I can, but the experience has got me stumped!

The latest PR4100 firmware is installed.

Any thoughts? Cheers.


#2

Hi AMD,

All the drives in My Cloud PR4100 are configured under RAID 5. If you remove drive-3 from enclosure, remaining drives 1 & 2 will go to red due to RAID mismatch. Once you place the defective drive-3 with the new one and rebuild RAID from the dashboard, it will come back online with blue status.


#3

Hi asp73,

Thank you for your reply and input. Much appreciated.

I did try again to replace the Failed Disk 3, But I get the same result once the system is up. Drives 1 & 2 show as bad, failing the S.M.A.R.T. test. Which stops me from being able to rebuild the RAID.

Disk1|Failed - Quick disk test failed. Please backup your data and replace this disk. If you need further assistance, contact WD Support.|
|Disk2|Failed - Quick disk test failed. Please backup your data and replace this disk. If you need further assistance, contact WD Support.|
|Disk3|Passed - Quick disk test completed successfully.|
|Disk4|Passed - Quick disk test completed successfully.|

Reinserting the Bad Disk 3, makes the Raid come back up , with volume degraded warning and instruction to replace Disk 3.

Disk1|Passed - Quick disk test completed successfully.|
|Disk2|Passed - Quick disk test completed successfully.|
|Disk3|Failed - Quick disk test failed. Please backup your data and replace this disk. If you need further assistance, contact WD Support.|
|Disk4|Passed - Quick disk test completed successfully.|

Bit of a head scratcher. I wonder if I should format the new Disk prior to inserting?