Rebooted into the Perc 6/iR controller BIOS, and realized this is an entirely different RAID BIOS, with pretty much the only option available being to "Resynchronize".  Which after selecting that, the resync complete successfully an hour later and everything was OK.
My understanding was that the replacement drive should have come up as ready.... not sure where to go. Controller SAS 6/iR Integrated (Embedded)ID : 0:0:0Status : CriticalName : Physical Disk 0:0:0State : OfflinePower Status : Not ApplicableBus Protocol : SASMedia : HDDDevice Life Remaining : Not ApplicableFailure Predicted : NoRevision : 5701Driver Version : Not ApplicableDevice Life Status : Not ApplicableModel Number : Not ApplicableCertified : Not ApplicableEncryption Capable : NoEncrypted : Not ApplicableProgress : Not ApplicableMirror Set ID : Not ApplicableCapacity : 136.88 GB (146968412160 bytes)Used RAID Disk Space : 136.23 GB (146278862848 bytes)Available RAID Disk Space : 0.00 GB (0 bytes)Hot Spare : NoVendor ID : FUJITSUProduct ID : MBE2147RCSerial No. : D310PB600R7YPart Number : Not AvailableNegotiated Speed : 3.00 GbpsCapable Speed : 3.00 GbpsDevice Write Cache : Not ApplicableManufacture Day : Not AvailableManufacture Week : Not AvailableManufacture Year : Not AvailableSAS Address : 500000E1180B1492 ID : 0:0:1Status : OkName : Physical Disk 0:0:1State : OnlinePower Status : Not ApplicableBus Protocol : SASMedia : HDDDevice Life Remaining : Not ApplicableFailure Predicted : NoRevision : D906Driver Version : Not ApplicableDevice Life Status : Not ApplicableModel Number : Not ApplicableCertified : Not ApplicableEncryption Capable : NoEncrypted : Not ApplicableProgress : Not ApplicableMirror Set ID : Not ApplicableCapacity : 136.63 GB (146699976704 bytes)Used RAID Disk Space : 136.23 GB (146278862848 bytes)Available RAID Disk Space : 0.00 GB (0 bytes)Hot Spare : NoVendor ID : FUJITSUProduct ID : MBE2147RCSerial No. : D304PB70DD5MPart Number : PH0W328K7557117EC0WJA01Negotiated Speed : 3.00 GbpsCapable Speed : 3.00 GbpsDevice Write Cache : Not ApplicableManufacture Day : 05Manufacture Week : 29Manufacture Year : 2011SAS Address : 500000E1180F8D32
Dell M610 Blade.. Disk failure on RAID1, replacement drive 0:0:0 still showing 
offline