Magic SysRq S-U-B

• Linux systems without Magic SysRq "D" but with Magic SysRq can still save a lot of data.

  • S - Sync disks
  • U - Unmount disks
  • B - Boot system

• Data preserved

  • Cached data
  • Non-volatile data

• Data lost

  • Volatile data and Machine state
  • Shadow data

• Potential Risks

  • Same as Magic SysRq D

Notes: