要适当地计划可用性有大量的因素需要考虑。
A number of factors must be considered to appropriately plan for availability.
因为这可以在计划内停机期间保持系统正常运行，从而提高可用性。
Because it allows one to increase their availability by keeping systems up during planned outages.
这让系统能够在计划内停机期间正常运行，从而提高系统的可用性。
This increases the availability of systems by allowing the system to keep running during planned outages, without incurring downtime.
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