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Why are transfer rates so slow?

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I'm using converter standalone 5.5 to transfer VMs between two vSphere clusters.  The source is 4.1 and the destination is 5.5.  The reported transfer rate is about 10 MB / sec.  The hosts, storage and network end to end are capable of much higher transfer rates.  If I do a standard windows file copy from a guest on cluster A to a guest on cluster B I'm seeing about 100 MB / sec which is what i'd expect since the LAN connection is 1 Gbps, so the bottleneck seems like it has to be somehow related to VMware.

 

I've noticed that if I browse to a datastore on a host and upload a large file (e.g. an .ISO), that transfer rate is also much slower than what I would expect.  Is VMware doing some sort of throttling?  Is there something I can do to improve the transfer performance?


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