[Linux-HA] [right one] Please can anybody help: switch from v1 to v2 with 25 nodes

[Ragnar Kjørstad]

On Wed, Mar 14, 2007 at 11:40:28AM +0100, Andrew Beekhof wrote:
> >There is no reason to change the UUID of the machine,
> 
> actually there is one time when its really helpful...
> when you re-installed a machine and need to gave it the same uname as
> before but forgot to save the old hg_uuid file.
> 
> or when you want to assign a known value ahead of time as has been
> previously mentioned.

We're doing this to make sure the UUID stays consistent accross
reinstallation of nodes with heartbeat. However, this just doesn't feel
right. It's a binary file that is not well documented.

Why is the UUID not included e.g. in ha.cf? 
And why not in text format instead of binary?
And if the user didn't specify a UUID, why not generate one based on
uname (e.g. md5sum converted into UUID format) instead of using a random
UUID?

> but yes, extreme caution should be used when even contemplating
> looking at this file

I guess that proves my point :-)

-- 
Ragnar Kjørstad
Software Engineer
Scali - http://www.scali.com
Scaling the Linux Datacenter