Mike Cardwell wrote:
Madison Kelly wrote:
Until now, I've been building 2-node clusters using DRBD+LVM for the
shared storage. I've been teaching myself clustering, so I don't have
a world of capital to sink into hardware at the moment. I would like
to start getting some experience with 3+ nodes using a central SAN disk.
So I've been pricing out the minimal hardware for a four-node
cluster and have something to start with. My current hiccup though is
the SAN side. I've searched around, but have not been able to get a
clear answer.
Is it possible to build a host machine (CentOS/Debian) to have a
simple MD device and make it available to the cluster nodes as an
iSCSI/SAN device? Being a learning exercise, I am not too worried
about speed or redundancy (beyond testing failure types and recovery).
Yeah, that's possible. Just use iscsid to export the device. If this is
just for testing/learning purposes have you considered using virtual
machines to minimise the hardware footprint? You could have a single
host machine that acts as the SAN, exporting a device using iscsid and
three vm's running on top of VMWare server on the same machine which
make up the cluster...
Thanks! I was thinking that was what I could do, but I wanted to ask
before sinking a lot of time/money just to find out I was wrong. :)
I thought about Xen VMs. I'll have to see if I can simulate things like
fence devices and such. Though, as good as virtualization is, I wonder
how close I could get to simulating real world? When I run into
problems, it would be another layer to wonder about. However, there is
no denying the cost savings! I will look into that more.
Madi
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