How can the Datacenter WAAS determine if the data has previously been seen (and generate a signature), when it does not have the original data stored ?
Ans: This is uni-Directional so DC WAAS is not going to store it on disk.
If data chunks aren't stored, then only the signatures can be used to determine if the data has been previously seen. Does this mean that signatures are uniquely generated from data (i.e. two different data chunks can't generate the same signature) ?
Ans: Yes, signatures are unique but will be same from same chunk of data.
Hope this helps.
PS: Please mark this as Answered, if this answers your question.
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