开始storage network technology 的知识体系结构中的第三本书，前2本是中文的，发现中文书还是偶尔有几本精彩的。
note that some key point about storage network:
anything about redundancy
i/o path
single point of failure
anything about bottleneck
1.
From a host system perspective, a storage address space is the storage resource that a filing system manages.
Compare the following two sentences:
Data is written to a storage address space.
Data is written to either a physical disk or a virtual disk.
These two sentences say the same thing, but the first is much more straightforward and easier to grasp.
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