设计时还应注意有新的方法发布时实现的维护和升级的难度。
The implementation should also be designed for easy maintenance and upgrades when there are new releases of either methodology.
这里说的停机时间还包括为应用程序维护和升级所规划的停机时间。
This downtime also includes planned downtime of the application for maintenance and upgrading.
AIX 管理员面对的主要难题之一是，对系统上运行的各种软件进行维护和升级。
One of the main challenges AIX adminstrators face is maintenance and upgrades of different software running on their systems.
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