[prev] 43 [next]

Durability (cont)

Durabilty begins with a stable disk storage subsystem.

i.e. effects of putPage() and getPage() are consistent

We can prevent/minimise loss/corruption of data due to:

  • mem/disk transfer corruption: parity checking
  • sector failure: mark "bad" blocks
  • disk failure: RAID (levels 4,5,6)
  • destruction of computer system: off-site backups