我尝试在Ubuntu 16.04 lts上运行mongo v2.6.10：
mongod
并得到结果：
mongod --help for help and startup options
2017-09-16T12:15:19.660+0430 [initandlisten] MongoDB starting : pid=15959 port=27017 dbpath=/data/db 64-bit host=mahdi-MS-7808
2017-09-16T12:15:19.660+0430 [initandlisten] db version v2.6.10
2017-09-16T12:15:19.660+0430 [initandlisten] git version: nogitversion
2017-09-16T12:15:19.660+0430 [initandlisten] OpenSSL version: OpenSSL 1.0.2g 1 Mar 2016
2017-09-16T12:15:19.660+0430 [initandlisten] build info: Linux lgw01-12 3.19.0-25-generic #26~14.04.1-Ubuntu SMP Fri Jul 24 21:16:20 UTC 2015 x86_64 BOOST_LIB_VERSION=1_58
2017-09-16T12:15:19.660+0430 [initandlisten] allocator: tcmalloc
2017-09-16T12:15:19.660+0430 [initandlisten] options: {}
2017-09-16T12:15:19.660+0430 [initandlisten] exception in initAndListen: 28574 Cannot start server. Detected data files in /data/db created by storage engine 'wiredTiger'. The configured storage engine is 'mmapv1'., terminating
2017-09-16T12:15:19.660+0430 [initandlisten] dbexit:
2017-09-16T12:15:19.660+0430 [initandlisten] shutdown: going to close listening sockets...
2017-09-16T12:15:19.660+0430 [initandlisten] shutdown: going to flush diaglog...
2017-09-16T12:15:19.660+0430 [initandlisten] shutdown: going to close sockets...
2017-09-16T12:15:19.660+0430 [initandlisten] shutdown: waiting for fs preallocator...
2017-09-16T12:15:19.660+0430 [initandlisten] shutdown: lock for final commit...
2017-09-16T12:15:19.660+0430 [initandlisten] shutdown: final commit...
2017-09-16T12:15:19.660+0430 [initandlisten] shutdown: closing all files...
2017-09-16T12:15:19.660+0430 [initandlisten] closeAllFiles() finished
2017-09-16T12:15:19.660+0430 [initandlisten] dbexit: really exiting now
错误 ：
initAndListen中的异常：28574无法启动服务器。检测到/ data / db中由存储引擎“ wiredTiger”创建的数据文件。配置的存储引擎为“ mmapv1”，终止
更新mongodb后显示错误。
initAndListen中的异常：28574无法启动服务器。检测到/ data / db中由存储引擎“ wiredTiger”创建的数据文件。配置的存储引擎为“ mmapv1”，终止
WiredTiger存储引擎仅在MongoDB 3.0或更高版本中受支持，因此您不能在MongoDB 2.6中使用这些数据文件。我还要指出的是，MongoDB 2.6于2016年10月到期，并且不再受支持。
如果不确定创建数据文件的MongoDB版本，建议安装最新版本的MongoDB（当前为3.4版本）。请参阅：在Ubuntu上安装MongoDB Community Edition。
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我来说两句