I've read similar stories, but this is my first time having to rebuild a RAID 5 array at home.
This is the most silly slow thankless task I have ever witnessed on a PC.
Going on 36 hours, for a 1.4TB array!
So why do I have a 1.4 TB RAID 5 array? it was to reuse 4 old 500GB drives which were once my photo storage in RAID 10 (striped and mirrored 1TB array, double speed and double copies)
When I moved up to larger drives, I housed the older 500gb drives in an external RAID box with 4 bays.
This was still a great idea, but the choice of RAID 5 maybe not so much.
If I gave up that 400GB for a mirrored RAID 1 array instead, my rebuild would have taken well under an hour.
Anyway, I actually had the 5th drive for a replacement, so I went RAID 5, and one drive died two days ago (click of death!!!) so I began the rebuild.
So it gets to 97% about 30 minutes ago, with just 24 minutes estimated remaining,.. then guess what? I get an error. It isn't going to finish!!!
My Redundant RAID 5 array is not going to rebuild, and despite the "redundancy" and the new drive, I won't be able to get any data off of it.
If I'd mirrored it (as I always have in the past) I would not need a working RAID to retrieve the data.
Fortunately this is a copy of a copy.. but some might have used a RAID 5 thinking they were covered.
This will be my last use of RAID 5