We had a power cut the other day and to maximise the run time on my web servers I powered down most of my switches and other servers. Since bringing back up the environment I have been having network speed issues. When copying a file of one of my DC (who hosts file shares) it takes 53 mins to copy a 100MB file. However if I do the same test between my DCs it takes <1min.
First I though it was the switches however since then I have unpluged the one switch contains the servers and a few other machines and the same problem can be seen in the environment too.
Ideas and help please :-)