Sure, the least I can do. Dell R510's (2x with same issue) each with 2x 4-way xeon 2.4GHz and 24GB 1333 ecc ram. Very light load on one, zero load on the other with same transfer problem.
Problem occured during V2V clones (hot or cold) to HP z210's as a temp measure to keep the servers up during primary hardware reconfiguration. The HPs are i7 but give a non-virtualising error during install, all guests are 32bit so not a *huge* issue. As they have to de-SSL the transfer I guess they could've been part of the transfer issue, still, they are beastly 4-way 3.4GHz machines with 16GB 1600 ram so decrypting a simple transfer like this is not beyond their means. They have single-disk datastores, one per guest (only running for a day or two). The guests are performing quite well. Only requirement for the HP customized installer was banging in an intel nic as I'm new to adding esxi drivers...wtf...
One problem I recently became aware of was having esxi 4.1 on the same diskset as the datastore, could be part of the issue however of course that was still the case when the system was able to deliver up to 60MB/s.
Disksets were 4x100GB SSD and 4x900GB all in raid5 - again, not ideal but still able to deliver 60MB/s.
Now installing 5.1 to internal USB-stick with datastores at raid10 with some extra disks, can't wait for the outcome.
Thanks again - the SSL issue still has me reeling. I'm guessing it relates to the same old issue with SCP.