Fast Smart Recovery

Details

Detail name Value
Changelog Number 375
Type Improvement
Status Resolved
Fix Versions EXASOL 6.0.0
Resolution Date 2017-03-16

Improvement
The recovery mechanism has been significantly improved in order to reduce the amount of data that is:

  • restored after recovering a failed component of a volume
  • copied when moving a node or increasing the redundancy of a volume

Benefit
Reduce restoration times and shorten the duration of degradation (reduced redundancy)
This also improves the database performance by reducing I/O and network load.
Additionally the following operations are accelerated:

  • moving a node
  • increasing redundancy
  • manually restoring a component

Details
mechanisms have been implemented or improved to:

  • better track the actually modified data on a volume in order to reduce time for automatic recovery / data restoration
  • analyse and report the actually used space within a volume to EXAStorage in order to further reduce the time for restoration, moving a node or increasing redundancy