我无法在CentOS 6系统上启动MySQL。当我检查mysqllog错误时，我得到的是
121117 11:16:19 [ERROR] /usr/libexec/mysqld: Error writing file '/var/run/mysqld/mysqld.pid' (Errcode: 28)
121117 11:16:19 [ERROR] Can't start server: can't create PID file: No space left on device
121117 11:16:19 mysqld_safe Number of processes running now: 0
我运行了一个df -h命令，如果我没记错的话，/var/光盘使用率仅为4％。
/dev/sda6 16G 15G 0 100% /
tmpfs 3.9G 0 3.9G 0% /dev/shm
/dev/sda1 194M 51M 134M 28% /boot
/dev/sda3 1008M 284M 674M 30% /tmp
/dev/sda5 1008M 34M 924M 4% /var/tmp
/dev/sdb1 79G 184M 75G 1% /mnt/vol1