[ovirt-users] What prevents from using a very very low-end hardware for manager?

[Daniel Helgenberger]

Hello Sven,

thanks:

On Fr, 2014-06-20 at 11:30 +0000, Sven Kieske wrote:
> 
> 
> Am 20.06.2014 13:12, schrieb Daniel Helgenberger:
> > here free -m on my ovirtengine:
> > 
> > ssh root at ovirtengine.lab.mbox.loc free -m
> >              total       used       free     shared    buffers     cached
> > Mem:          3830       2689       1141          0        151        669
> > -/+ buffers/cache:       1868       1961
> > Swap:         2047          0       2047
> > 
> > One could argure the buffers, but my engine is using about 2GB without.
> > Currently I have 10 VMs running + HE (mem capacity reasons on the HV's).
> > But IIRC I had times when HE was using about 3.5 GB. 
> > 
> > This is why I considered the 4GB ML as reasonable. Can you point out BZ
> > for me?
> 
> Well your system seems to use 1800 MB in total, so engine will just use
> a (major) fraction of that.
> 
> My apologies, but it turns out, there is no BZ, just a discussion
> thread on this ML:
> http://lists.ovirt.org/pipermail/users/2014-May/024237.html

The author of the thread (Sven van Acker) sates:

"The solution to this problem is to have at least 4GB of RAM, after
which oVirt seems to start up fine (with only 1.2GB of RAM in use)."

This describes the outcome of my tests somewhat. I had start up problems
wich were gone after I bumped up the allocated RAM in an early test VM.
I never tested it on a bare metal system but assume it will be the
same. 

I can only suspect the reasons and this might get "fixed" in the future.
OTOH it seems reasonable for me to have RAM available for postgresql
anyway.

@Nicolas, keep in mind system performance of the engine not only affects
the UI; but also various processes in the background.
Also, if you plan on using the VDI and self-deployment features ("User
Access") a slow UI might be very counterproductive and OOM conditions
the system unstable.

 
> 
> It's somewhat hijacked because the initial problem was something else.
> See my and R P Herrolds postings in particular.
> 
> But I guess this new thread just shows that the stated requirements for
> a minimal system should get tweaked in the docs.
> 
> -- 
> Mit freundlichen Grüßen / Regards
> 
> Sven Kieske
> 
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