I do always facing with this problem which for me a major problem. After a succesfull install and the server go to production mode. Suddenly i recieve this problem:
1- What ever I type on the command will appear this:
who command> -bash: /usr/bin/who: Input/output error
ps -ef command> -bash: /usr/bin/w: Input/output error
What cause this error and how to fix and prevent it? Normaly i will have to restart the server.