Is Toshiba drive is 512e drive? You can not mix 512e and 4 KB drives on same virtual disk. This could be the reason for the behavior you seen if Toshiba is not 512e drives.
Hi, I currently have 2 arrays, 1 raid-0 the other raid-5. The raid-5 array has 3 seagate drives, and ive added a toshiba drive in an effort to extend the array. But when i use OSM the newly added drive doesnt show up in the list, so cannot be added when reconfiguring. I tried to delete the array and create it from scratch, initially i see all 4 drives, but as soon as i select one of the seagate drives the toshiba drive is suddenly greyed out. If instead i select the toshiba drive then suddenly the 3 seagate drives are greyed out. The 2 different dive specs are: Seagate Skybolt ST1800MM0159 ST58 1.8TB SAS 12Gbps 10k 512e Toshiba AL14SE 1.8TB 12Gbps 10k SAS Any ideas why i cant use the 4 drives together? Do they all need to be from the same manufacturer? All specs seem the same and ive used OpenManage Enterprise to update all relevant firmware to latest versions.    
R630 with Perc H730 Mini cannot extend raid 5 array using OSM