Before performing your migrations — and after each stage in an iterative upgrade — check to ensure that you have a stable state.

在执行迁移之前以及在迭代升级的每个阶段之后都应进行检查，以确保您处于稳定状态。

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However, it's useful to have a tool to check before committing to the upgrade.

然而在进行升级之前用一个通过一个工具检查一下还是挺有用的。

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The rolling upgrade process starts with a check to see if the secondary server can be transformed into an ER server.

滚动升级流程的第一步是检查辅助服务器是否能够转换为 ER 服务器。

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And, if you are hoping to upgrade without the price tag, check Optiontown's Upgrade Travel Option, which allows you to upgrade on Kingfisher flights, if seats are available, for a nominal price.

BBC: Smooth skies: The world's best airlines

The hotel's round-trip shuttle transports you and your creative-director-in-crime from Miami International Airport to the luxurious hotel, where you receive a bottle of sparkling wine at check-in and an upgrade from a studio to a stylish one-bedroom suite.

BBC: Daily deal: Mid-century mod in Miami

The Windows 8 Upgrade Assistant will also check your PC to make sure it is ready for Windows 8.

FORBES: Microsoft Announces A Limited Time Windows 8 Pro Upgrade For $39.99