Red Hat GFS 6.0 -, Administrator'S Manual

Page: 119 / 192

Chapter 9. Managing GFS 105
tory (and all its subdirectories). Existing files with zero length can also have data journaling turned on
or off.
Using the
gfs_tool
command, data journaling is enabled on a directory (and all its subdirectories)
or on a zero-length file by setting the
inherit_jdata
or
jdata
attribute flags to the directory or
file, respectively. The directory and file attribute flags can also be cleared.
9.8.1. Usage
Setting and Clearing the
inherit_jdata
Flag
gfs_tool setflag
inherit_jdata
Directory
gfs_tool clearflag
inherit_jdata
Directory
Setting and Clearing the
jdata
Flag
gfs_tool setflag
jdata
File
gfs_tool clearflag
jdata
File
Directory
Specifies the directory where the flag is set or cleared.
File
Specifies the zero-length file where the flag is set or cleared.
9.8.2. Examples
This example shows setting the
inherit_jdata
flag on a directory. All files created in the directory
or any of its subdirectories will have the
jdata
flag assigned automatically. Any data written to the
files will be journaled.
gfs_tool setflag inherit_jdata /gfs1/data/
This example shows setting the
jdata
flag on a file. The file must be zero size. Any data written to
the file will be journaled.
gfs_tool setflag jdata /gfs1/datafile
9.9. Configuring
atime
Updates
Each file inode and directory inode has three time stamps associated with it:
•
ctime
— The last time the inode status was changed
• mtime
— The last time the file (or directory) data was modified
• atime
— The last time the file (or directory) data was accessed