I have a Dell PowerEdge 2950 with this card: RAID bus controller [0104]: Dell PowerEdge Expandable RAID controller 5 [1028:0015] and six disks in a RAID-10.

I replaced drive 2, because it didn't show up, and then it started to rebuild itself:

root@backup01:~# megaraidsas-status
-- Arrays informations --
-- ID | Type | Size | Status
a0d0 | RAID 10 | 5587GiB | DEGRADED

-- Disks informations
-- ID | Model | Status | Warnings
a0e8s0 | ATA ST2000DM001-9YN1 1863GiB | online | errs: media:0 other:5393
a0e8s1 | ATA ST2000DM001-9YN1 1863GiB | online | errs: media:0 other:5394
a0e8s2 | ATA ST2000DM001-1E61 1863GiB | rebuild | errs: media:0 other:99
a0e8s3 | ATA ST2000DM001-9YN1 1863GiB | online | errs: media:0 other:5393
a0e8s4 | ATA ST2000DM001-9YN1 1863GiB | online | errs: media:0 other:5393
a0e8s5 | ATA ST2000DM001-9YN1 1863GiB | online | errs: media:0 other:5393

The rebuild finishes, then the virtual drive becomes optimal, and drive 2 goes online. Then once a day, drive 2 acts like it's been removed, and the rebuild starts all over again. How do I make this once a day rebuild stop?

Event Description: Removed: PD 02(e1/s2)
Event Description: Removed: PD 02(e1/s2) Info: enclPd=08, scsiType=0, portMap=04, sasAddr=1221000002000000,0000000000000000
Event Description: State change on VD 00/0 from OPTIMAL(3) to DEGRADED(2)
Event Description: VD 00/0 is now DEGRADED1
Event Description: State change on PD 02(e1/s2) from ONLINE(18) to FAILED(11)
Event Description: State change on PD 02(e1/s2) from FAILED(11) to UNCONFIGURED_BAD(1)
Event Description: Background Initialization failed on VD 00/0
Event Description: Inserted: PD 02(e1/s2)
Event Description: Inserted: PD 02(e1/s2) Info: enclPd=08, scsiType=0, portMap=04, sasAddr=1221000002000000,0000000000000000
Event Description: PD 02(e1/s2) is not a certified drive
Event Description: State change on PD 02(e1/s2)
Event Description: State change on PD 02(e1/s2) from UNCONFIGURED_GOOD(0) to OFFLINE(10) from UNCONFIGURED_BAD(1) to UNCONFIGURED_GOOD(0)
Event Description: Rebuild automatically started on PD 02(e1/s2)
Event Description: State change on PD 02(e1/s2) from OFFLINE(10) to REBUILD(14)