master 端:
断网、杀掉 MFS 的 master 服务对 MFS 系统无影响。
断电可能会出现以下的情况:
#当没有文件传输时,可在服务器重启之后,运行 mfsmetarestore –a 进行修复,之后执行
mfsmaster start 恢复 master 服务。
# mfsmetarestore -a
loading objects (files,directories,etc.) ... ok
loading names ... ok
loading deletion timestamps ... ok
loading chunks data ... ok
checking filesystem consistency ... ok
connecting files and chunks ... ok
store metadata into file: /var/lib/mfs/metadata.mfs
# mfsmaster start
working directory: /var/lib/mfs
lockfile created and locked
initializing mfsmaster modules ...
loading sessions ... ok
sessions file has been loaded
exports file has been loaded
mfstopology configuration file (/etc/mfstopology.cfg) not found - using defaults
loading metadata ...
loading objects (files,directories,etc.) ... ok
loading names ... ok
loading deletion timestamps ... ok
loading chunks data ... ok
checking filesystem consistency ... ok
connecting files and chunks ... ok
all inodes: 5
directory inodes: 3
file inodes: 2
chunks: 2
metadata file has been loaded
stats file has been loaded
master <-> metaloggers module: listen on *:9419
master <-> chunkservers module: listen on *:9420
main master server module: listen on *:9421
mfsmaster daemon initialized properly
#当有文件传输时,可能会在/usr/local/mfs/sbin/mfsmetarestore –a 进行修复时可能会出现:
# mfsmetarestore -a
loading objects (files,directories,etc.) ... ok
loading names ... ok
loading deletion timestamps ... ok
loading chunks data ... ok
checking filesystem consistency ... ok
connecting files and chunks ... ok
�S:115: error: 32 (Data mismatch)
此时无法修复也无法启动 master 服务,有个应急的办法是将 metadata.mfs.back 复制成
metadata.mfs,然后再启动 master。这样将会丢失那些正在传输的数据。