xtrabackup 报错，求助

yuanxb1985

xtrabackup 版本为 xtrabackup-1.6.3-292.rhel5，OS为centos 5.5 32位
备份出现错误如下所示：
/usr/bin/innobackupex --defaults-file=/etc/my.cnf --host=10.3.1.250 --user=backup --password=backup --port=3306  /web/bakcup/
xtrabackup_51 version 1.6.3 for MySQL server 5.1.56 pc-linux-gnu (i686) (revision id: 292)
xtrabackup: uses posix_fadvise().
xtrabackup: cd to /web/mysql/var1
xtrabackup: Target instance is assumed as followings.
xtrabackup:   innodb_data_home_dir = ./
xtrabackup:   innodb_data_file_path = ibdata1:10M:autoextend
xtrabackup:   innodb_log_group_home_dir = ./
xtrabackup:   innodb_log_files_in_group = 2
xtrabackup:   innodb_log_file_size = 5242880
InnoDB: No valid checkpoint found.
InnoDB: If this error appears when you are creating an InnoDB database,
InnoDB: the problem may be that during an earlier attempt you managed
InnoDB: to create the InnoDB data files, but log file creation failed.
InnoDB: If that is the case, please refer to
InnoDB: http://dev.mysql.com/doc/refman/5.1/en/error-creating-innodb.html
innobackupex-1.5.1: Error: ibbackup child process has died at /usr/bin/innobackupex-1.5.1 line 336.


--host=10.3.1.250 不是本机。
是不是有什么参数设置的不对。请大家赐教。谢谢！