RE: [Xen-users] Services running in dom-0 vc dom-u

[<J.Witvliet@xxxxxxxxx>]

Hi Jan,

On one of the systems connected to Internet (99.9999% of the systems are
not here) is doing mirroring of gwdg.de.
So my nfs-server (currently in dom-0) hosts the repo's for SuSE, ubuntu,
centos, fedora and *BSD.
The real rsyncing is done in a dom-U, but i found, if i do not apply
rate-limiting with rsync, it will destroy the dom-0, causing oopses and
panics.
When reported (both here and on the SuSE-list), i got the reply that i
should not have done it in the first place.
Other dom-u's are http(s) servers, acting as installation-servers or
VPN-end-points.

So i could rebuild the lot, with the dom-0 doing only xen-stuf, and have
the nfs-functionality transferred to a dom-U, but only if it solves
anything, otherwise it's a waste of time...

Hans


-----Original Message-----
From: Jan Bakuwel [mailto:jan.bakuwel@xxxxxxxxx] 
Sent: Tuesday, November 17, 2009 9:25 PM
To: Witvliet, J, CDC/IVENT/OPS/I&S/PLS/SMP/HRM/RP1
Subject: Re: [Xen-users] Services running in dom-0 vc dom-u

Hi Hans,

We've been running a few Xen servers with nfs, smb, ldap and imap/pop in
dom0, while using domU's for (Windows and Linux) desktop applications.
Generally speaking this works well although we do occasionally
experience NFS problems (dom0-domU).

The rule of thumb indeed seems to be to avoid running much in dom0 so
dom0 can concentrate on I/O. I think it depends on what you plan to do
with dom0/domU.

groet,
Jan


J.Witvliet@xxxxxxxxx wrote:
>
> Hi all,
>
> A while a go, I was told that it is advisable to run as little as 
> possible services in the dom-0.
> Is it safe / stable / advisable (whatever) to have these functions 
> (nfs, smb, rsync, etc) in a dom-U ?
>
> Kind reagards, Hans
>
> Defensie/CDC/IVENT/Research en Innovation Centrum Ing J. (Hans) 
> Witvliet Systeembeheer, CAcert-assurer
> T   0174-539053
> _mailto:j.witvliet@xxxxxxxxxx
> Coldenhovelaan 1, 3155RC Maasland, kamer A109
>
>
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