1.2.2. GFS 和​​​​​​​ GFS2 之​​​​​​​间​​​​​​​的​​​​​​​其​​​​​​​它​​​​​​​不​​​​​​​同​​​​​​​之​​​​​​​处​​​​​​​

GFS2 file systems do not provide support for context-dependent path names, which allow you to create symbolic links that point to variable destination files or directories. For this functionality in GFS2, you can use the bind option of the mount command. For information on managing pathnames in GFS2, see 第 3.11 节 “绑​​​​​​​定​​​​​​​挂​​​​​​​载​​​​​​​以​​​​​​​及​​​​​​​上​​​​​​​下​​​​​​​文​​​​​​​关​​​​​​​联​​​​​​​路​​​​​​​径​​​​​​​名​​​​​​​”.

使​​​​​​​用​​​​​​​ GFS 文​​​​​​​件​​​​​​​系​​​​​​​统​​​​​​​的​​​​​​​内​​​​​​​核​​​​​​​模​​​​​​​块​​​​​​​是​​​​​​​ gfs.ko。​​​​​​​使​​​​​​​用​​​​​​​ GFS2 文​​​​​​​件​​​​​​​系​​​​​​​统​​​​​​​的​​​​​​​内​​​​​​​核​​​​​​​模​​​​​​​块​​​​​​​是​​​​​​​ gfs2.ko。​​​​​​​

In GFS2 file systems, quota enforcement is disabled by default and must be explicitly enabled. To enable and disable quotas for GFS2 file systems, you use the quota=on|off|account option for the mount command. For information on enabling and disabling quota enforcement, see 第 3.4.4 节 “启​​​​​​​用​​​​​​​/禁​​​​​​​用​​​​​​​配​​​​​​​额​​​​​​​强​​​​​​​制​​​​​​​”.

GFS2 file systems support the use of the chattr command to set and clear the j flag on a file or directory. Setting the +j flag on a file enables data journaling on that file. Setting the +j flag on a directory means "inherit jdata", which indicates that all files and directories subsequently created in that directory are journaled. Using the chattr command is the preferred way to enable and disable data journaling on a file.

In GFS2 file systems, journals are plain (though hidden) files instead of embedded metadata. This means that journals can be dynamically added as additional servers mount a filesystem. For information on adding journals to a GFS2 file system, see 第 3.6 节 “在​​​​​​​文​​​​​​​件​​​​​​​系​​​​​​​统​​​​​​​中​​​​​​​添​​​​​​​加​​​​​​​日​​​​​​​志​​​​​​​”.

GFS2 文​​​​​​​件​​​​​​​系​​​​​​​统​​​​​​​不​​​​​​​支​​​​​​​持​​​​​​​ atime_quantum 可​​​​​​​调​​​​​​​节​​​​​​​参​​​​​​​数​​​​​​​，GFS 文​​​​​​​件​​​​​​​系​​​​​​​统​​​​​​​可​​​​​​​使​​​​​​​用​​​​​​​该​​​​​​​参​​​​​​​数​​​​​​​指​​​​​​​定​​​​​​​ atime 更​​​​​​​新​​​​​​​的​​​​​​​频​​​​​​​率​​​​​​​。​​​​​​​在​​​​​​​ GFS2 中​​​​​​​支​​​​​​​持​​​​​​​ relatime 和​​​​​​​ noatime 挂​​​​​​​载​​​​​​​选​​​​​​​项​​​​​​​。​​​​​​​建​​​​​​​议​​​​​​​您​​​​​​​使​​​​​​​用​​​​​​​ relatime 挂​​​​​​​载​​​​​​​选​​​​​​​项​​​​​​​获​​​​​​​得​​​​​​​与​​​​​​​在​​​​​​​ GFS 中​​​​​​​使​​​​​​​用​​​​​​​ atime_quantum 参​​​​​​​数​​​​​​​时​​​​​​​得​​​​​​​到​​​​​​​的​​​​​​​类​​​​​​​似​​​​​​​行​​​​​​​为​​​​​​​。​​​​​​​

在​​​​​​​挂​​​​​​​载​​​​​​​ GFS2 文​​​​​​​件​​​​​​​系​​​​​​​统​​​​​​​时​​​​​​​，您​​​​​​​可​​​​​​​以​​​​​​​指​​​​​​​定​​​​​​​ mount 命​​​​​​​令​​​​​​​的​​​​​​​ data=ordered 或​​​​​​​者​​​​​​​ data=writeback 选​​​​​​​项​​​​​​​。​​​​​​​当​​​​​​​设​​​​​​​定​​​​​​​ data=ordered 时​​​​​​​，传​​​​​​​输​​​​​​​中​​​​​​​修​​​​​​​改​​​​​​​的​​​​​​​用​​​​​​​户​​​​​​​数​​​​​​​据​​​​​​​会​​​​​​​在​​​​​​​传​​​​​​​输​​​​​​​被​​​​​​​递​​​​​​​交​​​​​​​到​​​​​​​磁​​​​​​​盘​​​​​​​前​​​​​​​被​​​​​​​冲​​​​​​​入​​​​​​​磁​​​​​​​盘​​​​​​​。​​​​​​​这​​​​​​​样​​​​​​​可​​​​​​​以​​​​​​​让​​​​​​​用​​​​​​​户​​​​​​​无​​​​​​​法​​​​​​​在​​​​​​​崩​​​​​​​溃​​​​​​​后​​​​​​​的​​​​​​​文​​​​​​​件​​​​​​​中​​​​​​​看​​​​​​​到​​​​​​​未​​​​​​​初​​​​​​​始​​​​​​​化​​​​​​​的​​​​​​​块​​​​​​​。​​​​​​​设​​​​​​​定​​​​​​​ data=writeback 时​​​​​​​，用​​​​​​​户​​​​​​​数​​​​​​​据​​​​​​​会​​​​​​​在​​​​​​​磁​​​​​​​盘​​​​​​​有​​​​​​​数​​​​​​​据​​​​​​​后​​​​​​​的​​​​​​​任​​​​​​​何​​​​​​​时​​​​​​​候​​​​​​​被​​​​​​​写​​​​​​​入​​​​​​​磁​​​​​​​盘​​​​​​​。​​​​​​​这​​​​​​​样​​​​​​​无​​​​​​​法​​​​​​​提​​​​​​​供​​​​​​​ ordered 模​​​​​​​式​​​​​​​可​​​​​​​提​​​​​​​供​​​​​​​的​​​​​​​一​​​​​​​致​​​​​​​性​​​​​​​保​​​​​​​障​​​​​​​，但​​​​​​​对​​​​​​​某​​​​​​​些​​​​​​​工​​​​​​​作​​​​​​​负​​​​​​​载​​​​​​​来​​​​​​​说​​​​​​​可​​​​​​​稍​​​​​​​微​​​​​​​加​​​​​​​快​​​​​​​一​​​​​​​些​​​​​​​速​​​​​​​度​​​​​​​。​​​​​​​默​​​​​​​认​​​​​​​设​​​​​​​置​​​​​​​是​​​​​​​ ordered 模​​​​​​​式​​​​​​​。​​​​​​​

gfs2_tool 为​​​​​​​ GFS2 支​​​​​​​持​​​​​​​的​​​​​​​选​​​​​​​项​​​​​​​组​​​​​​​与​​​​​​​ gfs_tool 命​​​​​​​令​​​​​​​为​​​​​​​ GFS 支​​​​​​​持​​​​​​​的​​​​​​​选​​​​​​​项​​​​​​​组​​​​​​​不​​​​​​​同​​​​​​​：

gfs2_edit 命​​​​​​​令​​​​​​​为​​​​​​​ GFS2 支​​​​​​​持​​​​​​​的​​​​​​​选​​​​​​​项​​​​​​​组​​​​​​​与​​​​​​​ gfs_edit 命​​​​​​​令​​​​​​​为​​​​​​​ GFS 支​​​​​​​持​​​​​​​的​​​​​​​选​​​​​​​项​​​​​​​组​​​​​​​不​​​​​​​同​​​​​​​。​​​​​​​