On 07/10/15 23:14, Matt wrote: > I have 3 4TB WD drives I want to put in a RAID1 array. > > Two WD4000FYYZ > > and > > One WD4000F9YZ > > All enterprise class but two are WD Re and one is WD Se. I ordered > the first two thinking 2 drives in the raid array would be sufficient > but later decided its a long drive to the server so I would rather > have 3 drives and ordered a third in accidentally did not get EXACT > same thing. Would there be ANY issues mixing these? > You probably won't have any issues from doing this so long as spin speed, cache size and storage size match. Although if using a RAID card they can sometimes be a bit more picky about the replacement drive you give them. We had one of our mail servers hard drives kick the bucket after 3 years active service, originally it had two Toshiba DT01ACA200's it now has 1x Toshiba DT01ACA200 and 1x HGST HUS724020ALA640 as we didn't have any Toshiba's around. Either way, the drive was added to the array, it rebuilt with mdraid and has been running fine with no problems for almost 3 months now. If using different drives were to cause issues, that would almost certainly have triggered it as it was a different manufacture and all. Naturally though make sure your drives match to a degree, aka, all are the same spin speed, have same buffer size, same storage size etc. But aside from that, you can almost stick any drive in and it'll rebuild and work using mdraid. Kind Regards, Jake Shipton (JakeMS) Twitter: @CrazyLinuxNerd GPG Key: 0xE3C31D8F GPG Fingerprint: 7515 CC63 19BD 06F9 400A DE8A 1D0B A5CF E3C3 1D8F