[qmailtoaster] Re: Virtual QMT

[Eric Shubert]

Sorry, Phil. I posted reply to Jake before I read this.

BTW, when you change a thread, please create a new message (copy/paste 
content as appropriate) instead of replying and changing the subject. 
When you look at messages in threaded view (nice feature btw), this 
isn't a new thread, only a changed subject. :( Common mistake.

Phil Leinhauser wrote:
So let's change the thread and explore yours a bit...

I'd be interested in where virtual QMTs choke.  Is it IO, proc, mem?  
Maybe too many other guests?

While I only have about 1/2 of your 500 user choke point, I get very 
good performance from my VM server based QMT.  I did have issues before 
I found some of the tuning points that I'm documenting in the wiki.  
I've been running some sort of VM in my small business since the days of 
GSX and in work I have a very large install of ESX / vSphere.  I do know 
things like heavily used databases and the like don't run too well 
virtualized.  I'd be interested to see if the QMT limit is something 
that can be overcome?

Me too. I think/feel/hope there's a way to improve on that.

FWIW, I talked with a company a year or so ago that was running Oracle 
in virtual guests, and they had managed to obtain satisfactory 
performance. They didn't go into specifics, so I don't know how they did 
it. Can be done though I believe.

I saw your discussion a few days ago with Eric about slow virtual 
performance but you said that was with something other than VM?

That was one Xen server. I don't know about the others he was working on 
though.

--
-Eric 'shubes'


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