当我在 mongo.conf 文件中启用 directoryperdb 选项时，mongodb 服务器服务无法启动。
2020-03-16T15:37:55.300+0530 I CONTROL [main] Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify --sslDisabledProtocols 'none'
2020-03-16T15:37:55.671+0530 I CONTROL [main] Trying to start Windows service 'MongoDB'
2020-03-16T15:37:55.672+0530 I CONTROL [initandlisten] MongoDB starting : pid=8776 port=27017 dbpath=C:\Program Files\MongoDB\Server\4.2\data 64-bit host=GGNUVBRESSCHINL
2020-03-16T15:37:55.672+0530 I CONTROL [initandlisten] targetMinOS: Windows 7/Windows Server 2008 R2
2020-03-16T15:37:55.672+0530 I CONTROL [initandlisten] db version v4.2.0
2020-03-16T15:37:55.672+0530 I CONTROL [initandlisten] git version: a4b751dcf51dd249c5865812b390cfd1c0129c30
2020-03-16T15:37:55.672+0530 I CONTROL [initandlisten] allocator: tcmalloc
2020-03-16T15:37:55.672+0530 I CONTROL [initandlisten] modules: none
2020-03-16T15:37:55.672+0530 I CONTROL [initandlisten] build environment:
2020-03-16T15:37:55.672+0530 I CONTROL [initandlisten] distmod: 2012plus
2020-03-16T15:37:55.673+0530 I CONTROL [initandlisten] distarch: x86_64
2020-03-16T15:37:55.673+0530 I CONTROL [initandlisten] target_arch: x86_64
2020-03-16T15:37:55.673+0530 I CONTROL [initandlisten] options: { config: "C:\Program Files\MongoDB\Server\4.2\bin\mongod.cfg", net: { bindIp: "127.0.0.1", port: 27017 }, service: true, storage: { dbPath: "C:\Program Files\MongoDB\Server\4.2\data", directoryPerDB: true, journal: { enabled: true } }, systemLog: { destination: "file", logAppend: true, path: "C:\Program Files\MongoDB\Server\4.2\log\mongod.log" } }
2020-03-16T15:37:55.674+0530 I STORAGE [initandlisten] Detected data files in C:\Program Files\MongoDB\Server\4.2\data created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'.
2020-03-16T15:37:55.674+0530 I STORAGE [initandlisten] exception in initAndListen: InvalidOptions: Requested option conflicts with current storage engine option for directoryPerDB; you requested true but the current server storage is already set to false and cannot be changed, terminating
2020-03-16T15:37:55.675+0530 I NETWORK [serviceStopWorker] shutdown: going to close listening sockets...
2020-03-16T15:37:55.675+0530 I - [serviceStopWorker] Stopping further Flow Control ticket acquisitions.
2020-03-16T15:37:55.675+0530 I CONTROL [serviceStopWorker] now exiting
答案1
如果您有现有的数据文件，则无法更改影响磁盘上数据布局的设置（如directoryPerDB或directoryForIndexes）。
启动日志中的错误消息指出了这一点：
InvalidOptions：请求的选项与 directoryPerDB 的当前存储引擎选项冲突；您请求 true，但当前服务器存储已设置为 false 且无法更改，终止
要更改现有部署的此选项，您需要mongodump更改mongorestore数据（对于独立部署）或通过复制进行滚动升级（对于副本集部署）。
查看文档diretoryPerDB了解如何为现有独立或副本集部署更改此选项的步骤。