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The total size of the file system in 512-byte units. The exact meaning of this figure is implementation-defined, but should include <space used>, <space free>, plus any space reserved by the system not normally available to a user. <space used> The total amount of space allocated to existing files in the file system, in 512-byte units. <space free>
du takes a single argument, specifying a pathname for du to work; if it is not specified, the current directory is used. The SUS mandates for du the following options: -a, In addition to the default output, include information for each non-directory entry-c, display a grand total of the disk usage found by the other arguments
Modern Linux distributions include a /run directory as a temporary filesystem , which stores volatile runtime data, following the FHS version 3.0. According to the FHS version 2.3, such data were stored in /var/run , but this was a problem in some cases because this directory is not always available at early boot.
The Linux console (and Linux virtual consoles) are implemented by the VT (virtual terminal) subsystem of the Linux kernel, and do not rely on any user space software. [3] This is in contrast to a terminal emulator, which is a user space process that emulates a terminal, and is typically used in a graphical display environment.
Server data (data for services provided by system). /sys: In some Linux distributions, contains a sysfs virtual filesystem, containing information related to hardware and the operating system. On BSD systems, commonly a symlink to the kernel sources in /usr/src/sys. /tmp: A place for temporary files not expected to survive a reboot.
Some Linux distributions (e.g. Debian) do not have a tmpfs mounted on /tmp by default; in this case, files under /tmp will be stored in the same file system as /. And on almost all Linux distributions, a tmpfs is mounted on /run/ or /var/run/ to store temporary run-time files such as PID files and Unix domain sockets.
The term user space (or userland) refers to all code that runs outside the operating system's kernel. [2] User space usually refers to the various programs and libraries that the operating system uses to interact with the kernel: software that performs input/output, manipulates file system objects, application software, etc.
However, the ZFS-Linux port of Lustre will be running ZFS's DMU (Data Management Unit) in userspace. [12] MinFS: MinFS is a fuse driver for Amazon S3 compatible object storage server. MinFS [13] lets you mount a remote bucket (from a S3 compatible object store), as if it were a local directory.