PeterT, according to the information you provided on your post the problem started once you replace the 2nd hard drive (1TB). We had seen this behavior before and it was caused by a lack of power.
It could be that these 2 new 1.5 TB HDD are demanding more power than the previous 1TB HDD.
You may want to check with the HDD manufacturer, which is the minimum power requirement.
You can also send me a print screen of how the system is seing the HDD on the Ctrl+i menu.
Thanks for the pictures PeterT.
This seems to be a strange behavior, since the size of the RAID 5 is correct. Would you please check if the second 1.5 TB hard drive needs to be formatted?
If it does, please delete all the information and install it back into the system. Then, check the status of the disk.
Access the Matrix Storage and check if you are able to choose the rebuilt option again.
Just a quick update. I have replaced new 1.5 TB disk with another one exact same model. I also have installed Matrix Storage Manager. After HDD replacement RAID start rebuilding itself. So far so good. 45% rebuild is completed (two days of running). If rebuild will complete successfully it would mean that dish I used as a replacement has some problems. I will keep you posted.
It looks like rebuild went to about 60% and died. Array shows Degraded status. Is it possible that RAID controller for some reason cannot accept bigger disk?
PeterT, when a RAID is rebuilding and it reached certain percentage and then fails; that there could be an issue with the onboard Raid controller.
I would recommend you to contact ASUS so they can troubleshoot the motherboard. Please remember to back up all data.
I replaced disk one more time. This time with the same 1 TB drive. Rebuild started and then I got error.
raid volume is degraded because of missing hard drives
All drives are green. I know that some desktop drive do not work with RAID. These drives are rated for servers and worked fine for many years. I wonder if there is a problem with Intel Matrix Storage software.
PeterT, I don’t thinks is a software related issue. I think it is more related to hardware.
Have you contacted ASUS?