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Device, File System and RAID Types
{PRODUCT} supports multiple types of devices and file systems. The lists below offer a short description of each available device, file system and RAID type and notes on their usage.
To select a device type or a file system of a partition or a logical volume, select it in the list in xref:Installing_Using_Anaconda.adoc#sect-installation-gui-manual-partitioning[Manual Partitioning] and select a `Device Type` and a `File System` from their respective drop-down menus on the right side of the screen. Then, click `Update Settings` and repeat this process for all mount points you want to modify.
`Standard Partition` - A standard partition can contain a file system or swap space. Standard partitions are most commonly used for `/boot` and the BIOS Boot and EFI System partitions. LVM logical volumes or Btrfs subvolumes are recommended for most other uses. See xref:appendixes/Disk_Partitions.adoc#appe-disk-partitions-overview[An Introduction to Disk Partitions] for additional information about the concepts behind physical partitions.
`LVM Thin Provisioning` - Using thin provisioning, you can manage a storage pool of free space, known as a _thin pool_, which can be allocated to an arbitrary number of devices when needed by applications. The thin pool can be expanded dynamically when needed for cost-effective allocation of storage space.
`RAID` - Creating two or more software RAID partitions allows you to create a software RAID device. One RAID partition is assigned to each disk on the system. See xref:Installing_Using_Anaconda.adoc#sect-installation-gui-manual-partitioning-swraid[Creating Software RAID] for instructions on creating software RAID.
`BTRFS` - Btrfs is a file system with several device-like features. It is capable of addressing and managing more files, larger files, and larger volumes than the ext2, ext3, and ext4 file systems. See xref:Installing_Using_Anaconda.adoc#sect-installation-gui-manual-partitioning-btrfs[Creating a Btrfs Layout] for more information about creating Btrfs volumes.
`ext4` - The ext4 file system is based on the ext3 file system and features a number of improvements. These include support for larger file systems and larger files, faster and more efficient allocation of disk space, no limit on the number of subdirectories within a directory, faster file system checking, and more robust journaling. Ext4 is the default and recommended file system used by {PRODUCT} Workstation and Cloud. The maximum supported size of a single ext4 file system is 50 TB.
`ext3` - The ext3 file system is based on the ext2 file system and has one main advantage - journaling. Using a journaling file system reduces time spent recovering a file system after a crash, as there is no need to check the file system for metadata consistency by running the [command]#fsck# utility every time a crash occurs.
`ext2` - An ext2 file system supports standard Unix file types, including regular files, directories, or symbolic links. It provides the ability to assign long file names, up to 255 characters.
`swap` - Swap partitions are used to support virtual memory. In other words, data is written to a swap partition when there is not enough RAM to store the data your system is processing. A swap partition should always be created; see xref:Installing_Using_Anaconda.adoc#sect-installation-gui-manual-partitioning-recommended[Recommended Partitioning Scheme] for details such as the recommended size.
`xfs` - XFS is a highly scalable, high-performance file system that supports file systems up to 16 exabytes (approximately 16 million terabytes), files up to 8 exabytes (approximately 8 million terabytes), and directory structures containing tens of millions of entries. XFS also supports metadata journaling, which facilitates quicker crash recovery. The maximum supported size of a single XFS file system is 500 TB. Starting with {PRODUCT}{nbsp}22, XFS is the default and recommended file system on {PRODUCT} Server.
Note that the size of an XFS file system can not currently be reduced without destroying and recreating the file system. If you expect that you will need to adjust the sizes of your file systems often, using XFS is not recommended, as it makes administration substantially more time-consuming.
`vfat` - The VFAT file system is a Linux file system that is compatible with Microsoft Windows long file names on the FAT file system.
`BIOS Boot` - A very small partition required for booting from a device with a GUID partition table (GPT) on BIOS systems and UEFI systems in BIOS compatibility mode. See xref:Installing_Using_Anaconda.adoc#sect-installation-gui-manual-partitioning-recommended[Recommended Partitioning Scheme] for details.
`EFI System Partition` - A small partition required for booting a device with a GUID partition table (GPT) on a UEFI system. See xref:Installing_Using_Anaconda.adoc#sect-installation-gui-manual-partitioning-recommended[Recommended Partitioning Scheme] for details.
Software RAID Types
`RAID0 (Performance)` - Distributes data across multiple disks. Level 0 RAID offers increased performance over standard partitions and can be used to pool the storage of multiple disks into one large virtual device. Note that Level 0 RAIDs offer no redundancy and that the failure of one device in the array destroys data in the entire array. RAID 0 requires at least two disks.
`RAID1 (Redundancy)` - Mirrors all data from one partition onto one or more other disks. Additional devices in the array provide increasing levels of redundancy. RAID 1 requires at least two disks.
`RAID4 (Error Checking)` - Distributes data across multiple disks and uses one disk in the array to store parity information which safeguards the array in case any disk within the array fails. Because all parity information is stored on one disk, access to this disk creates a "bottleneck" in the array's performance. Level 4 RAID requires at least three disks.