[one-users] Using OpenNebula for Linux desktops

[Carlo Daffara]

There are several things you can do to improve basic performance. First of all, if you use SPICE as a protocol use QXL as the KVM video card, it will provide a substantial
speedup (the emulated video card will be much more intelligent and the job of protocol compression will be much simpler). Then, IO speedup is the second low-hanging fruit. We
use aio=native, and this alone substantially increases io rates. The next step depend on the kind of datastore you use- NFS, an external SAN, etc. If you can provide some additional details I can give some more options. For example, for machines that require high random R/W we use cache=none as it does decrease double buffering, thus improving performance. 
You can use iotop on the machine that executes the KVM process to check how much does it write, and why.
In our tests, using OpenNebula on top of the MFS distributed filesystem we easily get VDI performance near to that of the hardware with limited tuning.
regards,
carlo daffara
CloudWeavers

----- Messaggio originale -----
Da: "ML mail" <mlnospam at yahoo.com>
A: "users" <users at lists.opennebula.org>
Inviato: Lunedì, 27 gennaio 2014 16:51:19
Oggetto: [one-users] Using OpenNebula for Linux desktops

Hi, 

I am currently evaluating OpenNebula for running KVM virtual machines which will be used as Linux desktops with the SPICE protocol. For now I have tried Fedora 20 as a desktop system with KDE and SPICE (using remote viewer) but I am quite disappointed with the performance. The desktop reacts quite slowly even basic things like displaying the main menu and using the terminal even on a 1 Gig LAN. 

So does anyone out there really use OpenNebula for this purpose with success? and are there any recommendations for speeding up things in order to make it really usable. 

Cheers, 
M.L. 

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