Re: [Xen-users] high availability iscsi and xen setup

[Mark Adams <mark@xxxxxxxxxxxxxxxxxx>]

Hi Thomas, Thanks for your response.

On Thu, Nov 04, 2010 at 03:46:44PM +0100, Thomas Halinka wrote:
> Hi Marc,
> 
> Am Donnerstag, den 04.11.2010, 12:58 +0000 schrieb Mark Adams:
> > Hi All,
> > 
> > I'm thinking about the best way to set this up, and would greatly
> > appreciate your learned opinions on it. I'm thinking of the following:
> > 
> > - 2 Storage servers, running LVM, heartbeat, drbd (primary/standy) and 
> > iscsi.
> >   This will protect against 1 storage server failing.
> 
> ACK
> 
> > - 2 Xen hosts, running heartbeat to ensure the domU's are available. If
> >   not, migrate all hosts on to other xen host. This will protect against
> >   1 xen host failure.
> 
> ACK
> 
> > 
> > Any opinions on this arrangement of setup or links to resources
> > discussing it would be much appreciated.
> 
> If ur interested i could provide a link to my wiki, which describes such
> a setup

That would be excellent, thanks. Do you also do any multipathing so you
have network redundancy? or do you deal with this in some other way?

> 
> >  Also any alternative ways to
> > provide the same HA would be useful for comparison.
> > 
> > - Any Pitfalls? 
> 
> nope - works like a charm
> 
> > - Gaps in the availability? (split-brain possibilities?)
> 
> Im running 2 iSCSI-Linux-Targets with a bunch of XEN-Boxes...
> 
> > 
> > - How would you add in additional xen hosts? would they always need to be
> > paired in this arrangement (1 fails over to the other..)
> 
> No need for pairing. Just use hb2 with crm and udev for static
> device-names...
> > 
> > - Is a clustered filesystem required?
> 
> NOT required, but im testing another kind of such a setup. My receipt is
> to run XEN-Boxes with glusterfs as filebases-Diskbackend...
> 
> http://www.gluster.com/community/documentation/index.php/GlusterFS_and_Xen
> 
> first tests were impressive and performance was higher than iscsi, since
> im running ~60VMs over 10GBit-Nics, where the iscsi-targets were the
> bottleneck :-(
> 
> > 
> > Thanks in advance for any advice or opinions on this.
> > 
> > Regards,
> > Mark
> 
> hth,
> 
> thomas
> 
> 
Cheers

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