input/output error from NFS client on CentOS
this error even good Linux Admins make from time to time, here’s the soltuion(s)
1) check that portmap start is running
service portmap start
chkconfig portmap on
once started try the mount again.
2) install nfs-utils
yum install nfs-utils
That’s it, you should be set, if one of those two does not work, then un-install and re-install nfs-utils.