High availability on two boxes

[Uno Engborg]

The problem is that it can't be expanded to more than 2 boxes in the future.


Thanks!
/uno


2008/5/5, Gijs <info at boer-software-en-webservices.nl>:
>
> You might want to take a look at http://www.drbd.org/.
> It basically does what you suggest. It creates a software raid 1 partition
> across a local and networked partition.
> Perfect for real-time syncronisation between disks across a network, while
> not having to resort to expensive stuff like SANs and the like.
>
> Regards,
>
> Gijs
>
> Uno Engborg wrote:
>
> > Hi,
> > I'm experimenting with a HA setup on two physical boxes.  The idea is to
> > create virtual Xen machines that  automagically do live migration from one
> > physical box to the other in case of e.g. a hardware failure on one of the
> > physial boxes.
> >
> > My idea is to create a software raid of networked block devices and real
> > disks.  I.e:
> >
> > Box A:
> > Software raid consisting of:
> > Physical disk in box A
> > Nework block device exported from box B
> >
> > Box B:
> > Software raid consisting of:
> > Physical disk in box B
> > Network block device exported from box A
> >
> >
> > On top of this I plan t use  GFS2 and a cluster that handles the
> > migration of the virtual machines.
> >
> > Any comments on this, would this work, or would it result in deadlock?
> > What about quorum disk? I suppose
> > I need one? Most setup of these kind of things usually have their
> > storage on a separate
> > SAN, but as this is mostly for experimentation and testing purposes, I
> > would hope that I could do without that for now.
> >
> > What would be the best way to export the network block devices? I'm
> > thinking iSCSI or GNDB?
> >
> > If this doesn't  look like a good idea, are there any other way to do
> > this.
> >
> > Regards
> > Uno Engborg
> >
> >
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