I need to upgrade my cms but want test the upgrades on a mirror site. This way I can work out the bugs before upgrading the real site. I'd do this on a different domain, would this hurt me in search engines. Should I put <META name="ROBOTS" content="NOINDEX,NOFOLLOW"> in meta tags? Please advise. Thanks
you can test out the thing live on the website also.It will not affect any search engine ranking just make sure that withing 24-48 hours testing is over.