If all 3 disks are 3.5 inch and NLSAS and the only difference is one drive 1TB and the other 2 disks are 500GB then yes you should be able to create the raid 5 array. However, the array will only use 500GB of the 1TB drive. Please let me know if you have any other questions or concerns.
Is it possible to have a RAID 5 Virtual Disk on a PERC 6/i Card with 2 disks of 500 Go and 1 disk of 1 To ?It's not a matter if, on the third disk, only 500 Go will be used.All disks are 3.5 inch, NearLine SAS and 7200 rpm Thank You  Philippe
PERC 6/i RAID 5 with disks of different size