How do I tell if my PR4100 is rebuilding a hard disk?

I had what looked like a bad drive on a My Cloud PR4100. I obtained a new drive and installed the new disk. I clicked the “Manual Rebuild” button from the web interface and, I think, the process started. After 30 minutes or so the “Drive Self Test” was still at 0% so I refreshed my browser, after the refresh the status was no longer there.

I did try logging through ssh and issued the command:

cat /proc/mdstat

and got the following which I didn’t find it useful:

Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md1 : active raid5 sda2[0] sdd2[3] sdb2[1]
23429492160 blocks super 1.0 level 5, 64k chunk, algorithm 2 [4/3] [UU_U]
bitmap: 5/8 pages [20KB], 524288KB chunk

md0 : active raid1 sdd1[2] sdb1[1] sda1[0]
2097088 blocks [4/3] [UUU_]
bitmap: 1/128 pages [4KB], 8KB chunk

A few hours later I can no longer log into the My Cloud either through the web page or ssh. From the front panel it says “Drive Status: Healthy” but the red light is still on under the new drive.

How do I tell if the rebuild is working and how far the rebuilding is going?



According to that, NO, there’s nothing rebuilding, and the RAID5 Array is still degraded.

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