Hello,
The SC throttles all writes to a VMFS to protect the running VMs from DIsk IO overloads. But it should not be that bad. I have seen some strange behavior with writing to datastores and doing too many actions at once, specifically vCenter actions and service console actions simultaneous... Both slow down considerably when you operate within the same data store.
Are you ONLY doing SFTP or something else on that same datastore?
BTW, I found that VMware Converter (standalone) is better for this type of thing... It works quite quickly.
Best regards,
Edward L. Haletky VMware Communities User Moderator, VMware vExpert 2009
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