Re: [Xen-users] Xen and iSCSI

[Michael Mey <michael.mey@xxxxxx>]

On Tuesday 31 January 2006 14:41, Markus Hochholdinger wrote:
> Hi,
>
> Am Dienstag, 31. Januar 2006 12:25 schrieb Michael Mey:
> > > Has anybody built a system using gnbd that supports several dom0 systms
> > > and migrating domU's?
> >
> > I had several scenarios for testing purposes running domU migrations
> > between dom0s. GNBD and iSCSI (iSCSI Enterprise Target and open-iscsi as
> > initiator) both worked fine for me and my stress tests :)
>
> which one have you decided to use? And why?
It was for getting to know which technology really works under high domU load 
for live-migration.
The storage decision depends on what you want to do and what budget you have. 

The first choice disregarding the costs would be a san. fc works fine, but 
san-boxes with iscsi are cheaper as the required equipment is (you don't need 
expensive fc-hba, fc-switch etc.).
If you want to implement a solution on your own, go for gnbd because it's 
simple, fast and reliable and can run on common hardware. You really wouldn't 
want to mess up with nfs. ok, a vbd as nfsroot is stable for high i/o load in 
contrast to a file image on a nfs server, but there a security and 
performance issues.
If you don't want a third box for live-migration and load-balancing, the next 
version of drbd could be interesting (with multiple masters) or you want to 
customize xen for usage with the current stable drbd release.
There's also an interesting commercial product called peerfs which also works 
nicely for live-migration and isn't that expensive.

So, it's up to your equipment, needs and budget what you want to implement :)

Michael
-- 
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Michael Mey                                  
Thinking Objects Software GmbH    |   mailto: michael.mey@xxxxxx 
Lilienthalstrasse 2/1             |   phone: +49 711 88770-147
70825 Stuttgart-Korntal, Germany  |   fax: +49 711 88770-449
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