[j-nsp] Image compatibility

[Richard A Steenbergen]

On Sat, Aug 04, 2007 at 02:57:14PM +0100, Evan Williams wrote:
> why concern yourself with the size of the JUNOS image, the platform should 
> give 5x9s availability

Because ISSU isn't working (yet), GRES isn't truely graceful (yet), and if 
you actually factor in the loss of availability due to copying unnecessary 
data and doing jinstall two-reboot style upgrades (a jinstall on a RE-2.0 
can stop forwarding for over 10 minutes) you'll realize that marketing 
probably just cost you at least one of those 9s. :P

Yes modern top of the line REs are much faster about the whole business 
today, but you can probably negate that advantage if you factor in 
bleeding edge code, if you've ever need to deploy daily builds, and if you 
ever need to rush to transfer new code to an impacted system in a hurry... 
Either way its silly not to try and minimize these kinds of impacts. I 
guarantee you that Foundry is selling boxes today solely because they can 
reboot before most customers even notice they crashed. :)

-- 
Richard A Steenbergen <ras at e-gerbil.net>       http://www.e-gerbil.net/ras
GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)