[已解决] ERROR! MySQL 谁来帮忙一下 感谢

筑之风草

不知道怎么情形 好好的就成这样
WDCP都没办法登入
[root@unassigned ~]# service mysqld restart
ERROR! MySQL server PID file could not be found!
Starting MySQL.. ERROR! The server quit without updating PID file (/www/wdlinux/mysql-5.5.36/data/unassigned.psychz.net.pid).

日志
InnoDB: mmap(2197815296 bytes) failed; errno 12
150404 22:47:37 InnoDB: Completed initialization of buffer pool
150404 22:47:37 InnoDB: Fatal error: cannot allocate memory for the buffer pool
150404 22:47:37 [ERROR] Plugin 'InnoDB' init function returned error.
150404 22:47:37 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
150404 22:47:37 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306
150404 22:47:37 [Note]   - '0.0.0.0' resolves to '0.0.0.0';
150404 22:47:37 [Note] Server socket created on IP: '0.0.0.0'.
150404 22:47:37 [ERROR] /www/wdlinux/mysql/bin/mysqld: Error writing file '/www/wdlinux/mysql/var/unassigned.psychz.net.pid' (Errcode: 28)
150404 22:47:37 [ERROR] Can't start server: can't create PID file: No space left on device
150404 22:47:37 mysqld_safe Number of processes running now: 0
150404 22:47:37 mysqld_safe mysqld restarted
150404 22:47:37 [Warning] Using unique option prefix myisam_recover instead of myisam-recover-options is deprecated and will be removed in a future release. Please use the full name instead.
150404 22:47:37 [Warning] Using unique option prefix myisam_recover instead of myisam-recover-options is deprecated and will be removed in a future release. Please use the full name instead.
150404 22:47:37 InnoDB: The InnoDB memory heap is disabled
150404 22:47:37 InnoDB: Mutexes and rw_locks use GCC atomic builtins
150404 22:47:37 InnoDB: Compressed tables use zlib 1.2.3
150404 22:47:37 InnoDB: Initializing buffer pool, size = 2.0G