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Re: [Xen-users] Cheap IOMMU hardware and ECC support importance

Adam Goryachev <mailinglists@xxxxxxxxxxxxxxxxxxxxxx> writes:

> PS, this is my personal advantage of using virtualisation... If I need
> n servers to run all my VM's, then with n+1 I can survive a failure of
> a dom0 (albeit with a reboot of the VM's being run there at the
> time). I still get to save on overall hardware requirements, as well
> as being able to live migrate for scheduled hardware maintenance/etc.

For how many servers do you need one standby?

Wouldn't you be better off not using a standby but moving each of the
VMs from a failed server to another one that still works?  One more or
less VM on a number of servers probably won't hurt?  You could even plan
for it and spare resources on existing servers for this, or enjoy things
running faster than required until you need the additional resources for
a migrated VM.

You'd need one server less per so many servers.  The less servers, the
less can fail.

Knowledge is volatile and fluid.  Software is power.

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