Software upgrade on box-to-box redundant CSS's

[w.mcmurry]

I am planning a software upgrade from version 5.00 Build 63 to version 6.1 on a pair of CSS 11150 devices running box-to-box redundancy.

Should both devices be upgraded at the same time, or can I split them and upgrade on consecutive weekends ?

[Gilles Dufour]

if it was 2 different 5.0 release, I would say ok.

But a 5.0 and a 6.1 release, it could be ok but that's not 100% sure.

Sorry, that's all I can say.

Maybe you could put both images on the CSS, boot the CSS out of 6.1 and configure them to reboot with 5.0 in case something wrong happens.

Gilles.

[j.slater]

I am in the same scenario as you describe? Did you ever find an upgrade procedure that minimizes downtime?