Hi [NAME],   I'm not good in MegaCLI nor Linux. But based on your screenshot, the drive that you have replaced, the state is GHS which might mean it's Global HotSpare. Could you change it to dedicated hotspare for the degraded RAID. 
I  replaced the failed disk with a new disk, but the new disk won't rebuild . Two disks below,  the disk of 8TB is new disk, disk of 6TB is the failed disk. [IMAGE]failed disk is DELL , new disk is seagate     output of Megacli: Enclosure Device ID: 32Slot Number: 1Enclosure position: 1Device Id: 1WWN: 5000C500E2095F64Sequence Number: 10Media Error Count: 0Other Error Count: 0Predictive Failure Count: 0Last Predictive Failure Event Seq Number: 0PD Type: SASHotspare Information:Type: Global, is revertible Raw Size: 7.277 TB [0x3a3812ab0 Sectors]Non Coerced Size: 7.276 TB [0x3a3712ab0 Sectors]Coerced Size: 7.276 TB [0x3a3700000 Sectors]Sector Size: 512Logical Sector Size: 512Physical Sector Size: 4096Firmware state: Hotspare, Spun UpDevice Firmware Level: E003Shield Counter: 0Successful diagnostics completion on : N/ASAS Address(0): 0x5000c500e2095f65SAS Address(1): 0x0Connected Port Number: 0(path0)Inquiry Data: SEAGATE ST8000NM001A E003WSD57HZNFDE Capable: Not CapableFDE Enable: DisableSecured: UnsecuredLocked: UnlockedNeeds EKM Attention: NoForeign State: NoneDevice Speed: 12.0Gb/sLink Speed: 12.0Gb/sMedia Type: Hard Disk DeviceDrive: Not CertifiedDrive Temperature :38C (100.40 F)PI Eligibility: NoDrive is formatted for PI information: NoPI: No PIPort-0 :Port status: ActivePort's Linkspeed: 12.0Gb/sPort-1 :Port status: ActivePort's Linkspeed: 12.0Gb/sDrive has flagged a S.M.A.R.T alert : No
New disk won't rebuild, Is it because the new disk is not certified or the 
different firmware level ?