openstack team mailing list archive

[Ryan Lane <rlane@xxxxxxxxxxxxx>]

> That's the whole point. For most interesting applications, "fast"
> automatic migration isn't anywhere near fast enough. Don't try to
> avoid failure. Expect it and design around it.
>

This assumes all application designers are doing this. Most web
applications do this fairly well, but most enterprise applications do
this very poorly.

Hardware HA is useful for more than just poorly designed applications
though. I have a cloud instance that runs my personal website. I don't
want to pay for two (or more, realistically) instances just to ensure
that if my host dies that my site will continue to run. My provider
should automatically detect the hardware failure and re-launch my
instance on another piece of hardware; it should also notify me that
it happened, but that's a different story ;).

- Ryan Lane