I tried running these commands several times and keep getting errors [by Cleus]
Just some info for anyone planning to do an online Raid & volume expansion.
Running 1880ix16 with ST5000DM000 (5900 RPM) drives.
Started with a healthy 3x5TB array and wanted to add a 4th drive. Throughout the expansion process it was running 2xVMs with low IO load.
First thing, when you perform a RAID expansion you need to add the drive to the RAID Array.
I have a raid 5 array constructed of three partitions, one of which is another array. This array should be assembled during boot so that it can be mounted and other services can access the mounted data.