RobHeffo May 20 2:17AM 2017
I have a brand new company and I am running on skeleton funding. Do I need separate licenses for all my virtual machines or just one for the physical server itself?
How does the software handle VHD/VHDX files? Does it recognize duplicate data eg: The OS files as part of the disk image (provided the disk is not encrypted)
Thanks Robert Heffernan Heffsoft Pty Ltd
gchen May 20 10:21PM 2017
It should be ok to have one license for each physical server. However, our licensing system in the GUI version can't recognize virtual machines running on the same physical server, so if you really want to run the GUI version on all the virtual machines you'll need one license per virtual machine for the license registration to work properly.
My suggestion is to run the CLI version on each virtual machine and then only one license is needed for each physical server. We'll release the source code under the Fair Source 5 License very soon so you may be able to use it for free depending on the number of users.
If you mainly use Duplicacy to backup VHD/VHDX files, you should enable the fixed-size chunking algorithm (by setting the max, average, and min chunk sizes to the same value when initializing the storage). This is because virtual disk files are rarely subject to bytes insertion and deletion so you don't really need the variable-size chunking algorithm.
As for the deduplication efficiency, it is unlikely that Duplicacy can deduplicate OS files inside the virtual disk files, unless you set the chunk size to the disk sector size, but a chunk size that small usually means significant overhead with chunk uploading.
There are cases where you can see deduplication between virtual machines -- for instance when you run different virtual machines from the same base image or you migrate a virtual machine from one physical server to another. In such cases you'll have only one copy of the virtual machines saved in the storage at the beginning, but the deduplication will be unlikely after changes are being made to each virtual disk file (due to the randomness in the file/sector placement).
RobHeffo May 21 7:05PM 2017
Ok, so I have purchased a license and installed the GUI version on the physical host and got that running.
Are there any instructions for the CLI version so I can take advantage of the deduplication across my servers?
Thanks!
gchen May 21 9:18PM 2017
There is a User Guide for the CLI version. Let me know if you have specific questions.