Beyond that, the big problem is that primary storage has a much lower percentage of duplicate data than backup data.

除此之外，最大的问题是，主存储上重复数据所占的比例要比备份数据要低得多。

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Another primary way that storage virtualization is classified is whether it is in-band or out-of-band.

另一种主流的对存储虚拟化分类的办法是，它是可控制的还是非控制的？

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In this technique, a primary storage controller provides the virtualization services for other storage controllers of same or different vendors.

在这种技术中，一个主存储控制器为相同或不同厂商提供的其他存储控制器提供虚拟化服务。

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It is generally believed that these cold storage data centers will use HDDs for primary storage rather than magnetic tape.

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Similarly, with less critical services, you should be able to reprovision from backup storage after a short but acceptable outage, even when the primary storage has been lost.

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Data reduction (compression and deduplication), once only implemented in backup storage, is showing up in some shops as a reality for primary storage.

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