当系统没有不需要的停机时间时它具有高可用性。
A system is highly available when it achieves no unwanted downtime.
最重要的“免麻烦”特性可能是完全支持滚动升级，这意味着不需要为了进行维护而停机。
And perhaps the most important "hassle-free" feature is full support for rolling upgrades-meaning zero downtime for maintenance.
系统管理员甚至操作员(通过WPAR管理员)可以把这些虚拟操作系统分区转移到其他系统，而不需要停机。
It does this by allowing either the systems administrator or even operators (through WPAR manager) to move these virtual operating system partitions to other systems, without incurring any downtime.
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