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Speeding up the Export to OVF Process?

Posted on 2014-12-03
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I have found that in my experience, no matter what the specifications of the host and the fact that we have 1GB network everywhere and good enough NAS.  Export to OVF takes mega ages to complete.  It always seems to go at a speed no faster than 6MB/s.

Is there a setting somewhere in vcenter to get this to move along at a faster clip, IE a speed that most modern cellphones can dwarf by all measures.  Like a "business usable" switch to on attribute in a configuration file or GUI.  It seems like a deliberate throttle, as there is no fundamental resource usage or limitation that I can see or am aware of that would slow this down to such a steadily rubbish speed.

Thanks for the information.
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Question by:CnicNV
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4 Comments
 
LVL 123
ID: 40478835
Exporting or copying data from ESXi, does take time, whether Export to OVF, download from datastore, or "VMware Converter", throughput is based on source datastore speed, network throughput between host and destination, and speed of target storage.

Part 10: HOW TO: Backup (Export) and Restore (Import) virtual machines to VMware vSphere Hypervisor 5.1 for FREE

Jumbo Frames can help.

How long does it take to Export, and what size of VM (only the data is exported).
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Author Comment

by:CnicNV
ID: 40479294
The size of the VM I was exporting was about 450GB, so it was large.  But its going from an at least 7200RPM hard drive to another 7200RPM hard drive, from a host that doesn't have all that much IO activity occurring on it over a 1 GB network.  5MB/s is slow, really slow.  The entire process took about 22 hours.

This is anecdotal of course, but if I copy a file from my computer over to a NTFS based network share on the same target NAS, its transfer speed is at least 25 MBs per second.

There is one thing I can think of, that the copy to the NAS from an ESXI host is being handled by the intermediary vcenter server that has the concerned NAS partition as a mapped drive on the OS.  So If I look at the switch, instead of activity going directly from the esxi host to the NAS, its going "through" the vcenter server, so I have three switch ports that are showing 5 MB/s.  But that's still unreasonably slow.  I suppose I can add a NAS partition as shared storage to vcenter and that this may make it faster, by double?  That's still only 10MBs.

I know with some forms of vmware vm migration it uses encryption, and that there are articles on disabling this and it being speed up be more than three times.  But, I don't see how the OVF export data in motion would be encrypted...

I dunno, in my opinion, no matter how you slice the bread it just seems like it could/should be faster than 5MBs
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 40479308
450GB is large, and those are slow datastores.

Any transfer will be slow.
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Author Closing Comment

by:CnicNV
ID: 40479341
Alright, it is what it is.

Thanks for the feedback and info :-)
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