Access is limited to within the same availability zone similar to a SAN in a data center.

访问仅限于同一个有效的区域，这个区域类似于数据中心的一个SAN。

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The availability zone is something that Amazon came up with to describe the location of the server.

可用性区域的概念是Amazon提出的，用来描述服务器的位置。

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The availability zone is chosen with -z us-east-1a, because the database server is in the same region.

使用 -z us-east-1a 可以选择可用性区域，因为数据库服务器是在同一地区。

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Not least, he says that the impact of the outage could have been reduced if clients had been using more than one availability zone to run their cloud businesses.

FORBES: Amazon Not Likely To See Lasting Effects From Web Outage

Last weeks outage only affected EBS volumes in a single Availability Zone, so those customers running with adequate capacity in other Availability Zones in the US East Region were able to tolerate the event with limited impact to their applications.

FORBES: Will Amazon's Servers Be Ready For Sandy?

By reducing credit availability national central banks can contravene the euro zone's wider monetary stance.

ECONOMIST: The Bundesbank should not exert its new clout too zealously