曹圖強(qiáng)：We typically call 導(dǎo)向器 to be director class fibre channel switch. You listed some of them. There are mainly two things:

From architectural aspect, it is high-bandwidth, high performance, high port-density platform. Cross-bars are typically used in this class to guarantee the performance bandwith.

From high-availability side, it is designed to have full redundancy physically (power supply, cooling system, supervisers) and also ensure firmware, software capability for system resiliency such as automatic failover and online, non-disruptive upgrade.
  

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