RE: [Xen-users] Best Practise for Xen in "clustered" Environment

["Artur Linhart - Linux communication" <AL.LINUX@xxxxxxxxxxx>]

Hello Stephan,

        Did You solved somehow this issue About You are speaking here? 

        Is there a good solution for a netwide LV which could be used and
would be suitable for DomUs?

        Thank You for any information in advance

                Artur

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Stephan Seitz
Sent: Wednesday, May 02, 2007 11:42 AM
To: XEN User - listmembers
Subject: [Xen-users] Best Practise for Xen in "clustered" Environment

Hi listmembers,

we're currently using Xen (3.0.4) on some dedicated Machines. The DomU's
root-fs as well as
the swapspace are located on the particular machines on lvm (single pv on
hardware raid).

As we are running a lot of dedicated machines which could also get xenified,
we assume it's
not the best practise in Installing a Xen "island" on every single machine.

One solution we thougth about was, putting the lvm space which is available
on every single
machine together via gfs, gnbd or similiar and let the domU's run from a
netwide available lv.

There are about 10-15 Machines available, each of them with at least 2 GBit
NICs, Hardware Raid
(3ware and areca) with useable capacity from 400G upto 2T. Architecture is
from x86 (P4 HT
without VT) upto x64_64 (EMT, Dual Xeon Dualcore with VT), RAM is probably
an issue, because some
of the older machines doesn't support more than 4G); there are also some
equivalents equipped
with AMD Processors (Dual Opteron with VT (the AMD equivalent, i think this
is called pacifica))

The DomU's should only run x86_32 and don't need to be fully virtualized.
Paravirtualization should
always be enough (or even better).

We're currently really unsure, if this is in general a good idea, also if
it's practical, how would
you get the lvm space together, as there are uncountable different
possibilities ?
I would like to see, how you would do (or leave) this?

A SAN/NAS solution is not possible, as we want to consolidate currently
available hardware. Bying
new storage space is a no-go. Well, relatively low-prized equipment like
additional NIC's or RAM
shouldn't be a problem. The currently installed "internal" switch is capable
of any kind of port
truncing, qos and vlan on GBit, so network speed shouldn't be such a
problem. FC isn't availabe.

If you've an ideas, I would really like to hear from you.

Thanks in advance!


-- 
Stephan Seitz
Senior System Administrator

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