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File System
Sysctl Prefix: fs
/proc Prefix: /proc/sys/fs/
Parameter
Description
file-max
Maximum number of file descriptors
file-nr
Number of file handles
The system file_descriptor limit is set using file-max. The descriptor limit is the maximum number of file descriptors that any one process may open at once. The file-nr has three fields: the number of allocated file handles, the number of used file handles, and the maximum number of file handles.
Parameter
Description
inode-state
Inode status
inode-nr
Free and used inodes
The first field of inode-state, nr_inodes, denotes the number of inodes the system has allocated. The second field, nr_free_inodes, specifies the number of free inodes. The inode-nr parameter contains the first two fields of the inode-state parameter.
Parameter
Description
super-max
Maximum number of file systems
super-nr
Number of mounted file systems
The super-max parameter controls the maximum number of super blocks and thus determines the maximum number of mounted file systems the kernel can have. This value needs to be increased if there is a need to mount more file systems than the current value in super-max.
Parameter
Description
dentry-state
Status of directory cache
The directory entries are dynamically allocated and deleted. These parameter values show the current status. The first field, nr_dentry, specifies the number of directory entries. The second field, nr_unused, specifies the number of unused directory entries.
Parameter
Description
dquot-nr
Number of allocated and free disk quota entries
dquot-max
Maximum number of cached disk quota entries
Parameter
Description
dir-notify-enable
Enables dnotify
The dir-notify-enable field enables or disables the dnotify interface on a system-wide basis.
Parameter
Description
aio-max-nr
Maximum number of AIO requests
aio-nr
Number of AIO requests
