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

[Jan Bakuwel <jan.bakuwel@xxxxxxxxx>]

Hoi Hans,

> 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.
>   

On another Xen server I've experienced domU hangs presumably due to dom0
not being able to process all I/O requests on time (dom0 continued to
live happily though as did other less I/O intensive domU's). The
solution was to allocate CPUs more specifically (ie. pin them to either
dom0 or domU and making sure dom0 has sufficient resources. I also
applied CPU "weights" in that case.

I've only seen kernel panics/oopses on a Xen server with an Adaptec Zero
RAID controller. Removing the controller (and using software RAID)
"fixed" that problem.

It might help if you post specific Xen/kernel version on the list - I'm
sure there are some (not me) folks here that know about possible issues
with Xen versions / kernels 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.
>   

Did the poster also say why you shouldn't have done that 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...
>   

Good luck.

Jan


_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users