Is it possible for a host (in this case a tape library) to be in multiple vsans on the same switch ?, I can configure multiple vsans but when I go to the host it can only be a member of 1 of them, which kind of defeats the idea of multiple vsan's . I looked at trunking but thats only for switch to switch connectivity as I understand it.
No, a host HBA port can only be a member of 1 VSAN at a time. If the host needs to connect to storage in a different VSAN then IVR (Inter VSAN Routing) must be configured. Normally you place hosts and storage those hosts need access to in the same VSAN.
VSANs are used to logically separate a single switch/fabric for fault isolation or security. One example is test/dev and production where you have both environments connected to the same switch fabric but want to separate them. In this case you would create 2 VSAN and place test/dev SAN/hosts into one and production SAN/hosts into the other.
常见的数据中心之间通信均会采用运营商MSTP/OTN专线进行互联实现通信，由于长途线路价格昂贵通常我们需要最大化使用线路带宽，传统的网络传输中通常是尽力而为传输一旦突发流量较大就会发生线路拥塞的情况，从而影响业务正常通信传输。这时候我们可以采用Qos技术来实现数据中心思科设备之间关键网络流量保障，从而实现链路最大化利用。拓扑图场景如下：如上图，SW01是位于数据中心A的广域网接入Cisco Nexus 3048交换机，SW02是位于数据中心B的广域网接...
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