Re: [Xen-users] Xen on production enviroment

[Ramiro Willmersdorf <willmerstrog@xxxxxxxxxxxx>]

Well, I guess it depends a lot on what version do you use.
I used to run the stable version and was mostly happy with it,
I had some random lock-ups, missed interrupts from the hard disk,
which I cannot say were related to Xen or were a hardware problem.

Now, I'm having a terrible time the the FC4 rpms, which I understand
are based on Xen unstable.
Basically I've given up on making Domain_0 to communicate with
the guest domains via the network.

I tried every possible network setup, routed, bridged-new, bridged-old,
all to no avail. I ended up with the old style bridged setup because it
was the last one I tried.

Everything else works, I evenhave a DHCP server in one of the guest
domains, which serves machines on a different subnet from the rest of
the machines, and everything works fine (as it was before), but I
cannot, for instance, ssh from Domain_0 to a guest domain.

I can ssh to anyother machine and ssh back to the guest domain from
there, and it works fine, only the direct connection fails, it hangs
never completes. I even used ethereal to try to figure what was going
on, but couldn't find anything, the connection just hangs there waiting
for a packet that never arrives.

The guest domains cannot connect to Domain_0 either, which is
unpleasant
because on my setup I had some common services (DNS, nfs, etc.)
running on domain_0. I had to move this inside a guest domain.

Also, there are some issues with domains failing to shutdown properly,
and I've had one or two or three instant reboots when xm destroying
these wedged domains.

NOT that I'm complaining, mind you, it's not called
unstable for nothing :)

Apart from that, it's working really fine. I don't know if it is a
psychological effect of all the trouble I went through, but on one
of the guest domains that uses the disk a lot (a gentoo instalation :)
it seems *a lot* faster.

BTW, I 'upgraded' because I wanted to try GFS, and I thought it 
would be easier to use a redhat kernel that had all the stuff already
patched in. I'm not so sure right now...


--- tim Doyle <tim@xxxxxxxxxxxx> escreveu:

> Weve been running Xen for a bit now, and it has been very stable.
> The servers are running cooler, and with a lower load average, as 
> compared to other
> virtualization setups.
> Were running mulitple linux domU's per server, under a variety of
> loads,
> and the vps's are very responsive.  Xen is quite ready for
> production. 
> 
> -Tim
> 
> -- 
> Timothy Doyle
> CEO
> Quantact Hosting Solutions, Inc.
> tim [at] quantact dot com
> http://www.quantact.com
> 
> 
> 
> Nate Carlson wrote:
> 
> > On Tue, 26 Jul 2005, Marlon Cabrera Oliveira wrote:
> >
> >> Someone already use xen as production server?
> >> For example: 3 domains (mail, proxy and web server).
> >>
> >> And what about stability?
> >
> >
> > I've been using it for at least 6 months (don't recall exactly when
> I 
> > started) for my personal hosting needs. Started a few crappy 2U
> boxes; 
> > when I switched jobs, I built a reasonably production-grade colo.. 
> > currently running on 2x Dell PowerEdge 1550's (Dual P3 1ghz; I've
> got 
> > two more identical boxes waiting to be moved over from my old colo)
> 
> > with a gig of memory each, using fibre channel storage (systems are
> 
> > even booting off LUN's on the storage, so no local disk) to a 
> > PowerVault 660F, and using GFS for shared storage between nodes.
> Xen 
> > has worked great; I had some stability issues with the 660F, but 
> > Dell's been replacing parts for me, and things have been solid for
> the 
> > last month or so.
> >
> > I've got xenU's for admin, mail, web, 2x dns, 2x ldap, and various 
> > other toys. All working great.
> >
> > Currently using FC3's build of Xen Unstable from a couple months
> ago; 
> > once I get the other boxes moved to the current colo, I'm going to 
> > experiment with the current unstable.
> >
> >
>
------------------------------------------------------------------------
> > | nate carlson | natecars@xxxxxxxxxxxxxxx |
> http://www.natecarlson.com |
> > |       depriving some poor village of its idiot since 1981        
>    |
> >
>
------------------------------------------------------------------------
> >
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> >
> >
> 
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