![]() Journaling file systems keep track of changes not yet committed to the file system by recording the goals of those changes. It offers the benefits of a journaling file system without impacting performance. XFS provides for quick recovery, scalability and speed. Notice that I didn't use the word "only". Oracle currently supports 100 terabytes, but this is still huge. One exabyte equals one million terabytes. XFS is a 64-bit file system and, at least in theory, can handle file systems as large as 8 exabytes. Look at its contents and you should see something like this: $ ls -l /dev/ptsĬrw-w. The devpts file system mounted as /dev/pts provides pseudo-terminal support for tools like telnet and ssh. ![]() The mqueue file system type provides a lightweight buffer to temporarily store messages and endpoints that allow software components to connect to the queue in order to send and receive messages. It allows the use of all huge page sizes supported by the hardware and kernel. The hugetlbfs is an interface to the huge page capabilities of the underlying hardware. One purpose is to improve boot time.Ī devtmpfs file system uses automated device nodes populated by the kernel each time the system boots. ![]() They may appear to be mounted file systems, but they are not. If you were to unmount such a file system, everything stored in it would be lost. Everything is temporary in the sense that no files will be created on your hard drive. Both are file systems which keep all of their files in virtual memory. What are tmpfs and devtmpfs?īoth tmpfs and devtmpfs file systems maintain content that is truly temporary. It implements advanced features with a focus on fault tolerance, self repair and painless administration. The btrfs file system is a "copy on write" (COW) file system. Since ext, the other extended file systems – ext2, ext3 and ext4 – were developed, each with improvements over its predecessor. It was the first implementation that used a virtual file system (VFS) and could handle file systems up to 2 gigabytes (GB) in size. The first, ext, was implemented in April 1992 and was the first file system created specifically for the Linux kernel. The ext4 file system is the 4th generation ext file system. Others serve some very particular purposes. Some were built to replace older file system types with faster and more reliable ones. Linux systems make use of a variety of file system types. dev/sda1: Linux rev 1.0 ext4 file system data, UUID=417d867b-270d-4ceb-a3e1-58b9a5f5c4c4 (needs journal recovery) (extents) (64bit) (large files) (huge files) The file command with the -sL options can be used to list details for the file system associated with a particular disk partition. To view just a list of the file system types, use a command like this: $ mount | grep "/dev" | awk '' | sort | uniq dev/sdb1 on /apps type ext4 (rw,relatime,seclabel) dev/sda1 on /boot type ext4 (rw,relatime,seclabel) dev/sda2 on /home type btrfs (rw,relatime,seclabel,compress=zstd:1,ssd,space_cache,subvolid=256,subvol=/home) Mqueue on /dev/mqueue type mqueue (rw,nosuid,nodev,noexec,relatime,seclabel) Hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,seclabel,pagesize=2M) dev/sda2 on / type btrfs (rw,relatime,seclabel,compress=zstd:1,ssd,space_cache,subvolid=257,subvol=/root) Tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev,seclabel,inode64)ĭevpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,seclabel,gid=5,mode=620,ptmxmode=000) The mount command below shows file system types for mounted file systems (5th string) along with many additional details.ĭevtmpfs on /dev type devtmpfs (rw,nosuid,seclabel,size=4096k,nr_inodes=131072,mode=755,inode64) NAME FSTYPE FSVER LABEL UUID FSAVAIL FSUSE% MOUNTPOINTS It provides file system type information along other data – the file system version, the UUID (unique identifier) and mount point, along with details on how much space is available and what percentage of the allocated space is in use. The lsblk (list block devices) command displays information on block devices (storage devices that hold data in the form of blocks) – both hard drives and solid state drives. This sample command shows that the /dev/sda1 disk partition contains an ext4 file system. You can use the fsck (file system check) command to report on a particular file system as shown in the example below. Notice that the details include mount points, sizes, used and available space. Filesystem Type Size Used Avail Use% Mounted on
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