Re: xen proposal

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On Fri, Apr 18, 2008 at 03:33:22PM -0500, Mike McGrath wrote:

> The only reason we haven't done this already is the inability to detect if
> the box is already up somewhere (which is something we need already)
> Consider this scenario:
> 
> app1 running on xen1 (which is having high load from koji1 also on xen1)
> 
> People complain about the wiki.
> 
> We move app1 to a more free box, xen7.
> 
> high load causes CRASH
> 
> xen1 reboots.  Attempts to bring app1 up (already up on xen7)
> 
> Two machines try to write to the same disk - DOOM.

What about using gfs (or maybe just nfs from the netapp) to keep the
contents of /etc/xen/auto "synced" between hosts? Having /etc/xen/auto
as a link to [sharedarea]/auto-xenXX and making sure that the entries
there are unique will be a good start for a solution I think.

Kostas

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