I have had a error only during the installation of mysql.
Because I have do the command without change "yourmpassword" with mi password here:
mysqladmin -u root password yourrootsqlpassword
mysqladmin -h server1.example.com -u root password yourrootsqlpassword
But I have try to set mysql password successfully and erased (youm erase myslq-server) and reinstalled (youm install mysql-server)
I have hte error again, I hope do not have to reinstall everything again.
[root@localhost ~]# df -h
Filesystem Dimens. Usati Disp. Uso% Montato su
71G 6,0G 62G 9% /
/dev/hda1 99M 29M 65M 31% /boot
tmpfs 662M 0 662M 0% /dev/shm
none 662M 104K 662M 1% /var/lib/xenstored