Shorten unplanned outages

Unplanned outages do occur, and a key to availability is to ensure that when they do occur you can recover from them as quickly as possible.

The purpose of all recovery strategies is to get back to where you were before the outage occurred.

If you have a single system and you cannot achieve the level of availability you need using these strategies, you may want to consider clusters.

• Reduce the time to restart your system
  Unfortunately, systems periodically experience an unplanned outage. Use the availability tools described here to restart your system as quickly as possible after an unplanned outage.
• Recover recent changes after an unplanned outage
  After an unplanned outage, your goal is to get your system up and running again as quickly as possible. You want to get back to where you were before the outage occurred without having to manually re-enter transactions.
• Recover lost data after an unplanned outage
  You may lose data as a result of an unplanned outage, such as a disk failure. The most extreme example of data loss is losing your entire site, such as what might happen as a result of a natural disaster.
• Reduce the time to vary on independent disk pool
  When unplanned outages occur, data stored within independent disk pools is unavailable until they can be restarted. To ensure that the restart occurs quickly and efficiently, you should use recommended strategies for varying on your independent disk pools.