{{tag>raid megacli}}

====== megacli drive rebuild ======
If you get this error:

  CRITICAL: megacli:[Volumes(2): DISK0.0:Degraded,DISK1.1:Degraded: Devices(4): 06,07,04=Online 05 (WD-WCC1P1090364WDC WD2000FYYZ-01UL1B1 01.01K02)=Unconfigured(bad)]

You need to rebuild the drive. First use [[wiki:smartctl_commands#smartctl_megaraid_check|smartctl]] to check if the disk is ok.

Then check which disk is bad with
  megacli -pdlist -a0

If the disk for example is this one

  ...
  Enclosure Device ID: 252 
  Slot Number: 0
  ...


get full info

  megacli -pdinfo -physdrv[252:0] -a0

Steps:

1. Change the state to good

  megacli -pdmakegood -physdrv "[252:0]" -a0
  Adapter: 0: EnclId-252 SlotId-0 state changed to Unconfigured-Good.
  Exit Code: 0x00

2. If the following commands shows "Foreign flag" in "Foreign state" you need to clear it with:

  megacli -cfgforeign -clear -a0
  Foreign configuration 0 is cleared on controller 0.
  
3. Designate the drive as hotspare

  megacli -pdhsp -set -physdrv "[252:0]" -a0
  Adapter: 0: Set Physical Drive at EnclId-252 SlotId-0 as Hot Spare Success.
  
4. The automatic rebuild should now start. Check with

  megacli -pdinfo -physdrv[252:0] -a0

  ... Firmware state: Rebuild ...
  
  megacli -pdrbld -showprog -physdrv "[252:0]" -a0
  Rebuild Progress on Device at Enclosure 252, Slot 0 Completed 1% in 3 Minutes.

  Exit Code: 0x00

Or start the rebuild manually with
  megacli -pdrbld –start –physdrv “[252:0]” –a0

====== Tested on ======
  * 

====== See also ======
  * [[wiki:megacli_commands|megacli commands]]
  * [[wiki:output_megacli_predictive_error|output megacli predictive error]]
  * [[wiki:megacli_replace_disk|megacli replace disk]]

====== References ======
  * https://supportforums.cisco.com/t5/security-documents/recovering-a-disk-shown-as-unconfigured-bad-in-raid/ta-p/3116431