zend framework2 redis使用遇到的问题

$redis = $this->getServiceLocator()->get('Zend\Db\Adapter\Adapter\Redis');

var_dump($redis->setItem('zzc', '[e-mail]'));一直提示false，apache日志中也没有错误，

此时，在命令行下执行redis-cli
    set name lyblog

出现错误信息：MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk. Commands that may modify the data set are disabled. Please check Redis logs for details about the error.

执行

config set stop-writes-on-bgsave-error no

后ok 了

var_dump($redis->setItem('zzc', '[e-mail]'));就提示true了