File Systems

From David's Wiki
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There are several common ways to store binary information:

  • Database or key-value store (e.g. PostgreSQL, SQLite) - Good for small files or a finite amount of files which fit within the confines of a database.
  • Object store (e.g. S3) - same as a key-value store but typically designed to scale lots of files across multiple HDDs and hosts.
  • File systems (e.g. EXT4) - good for files where certain operations benefit from a hierarchical data structure, e.g. list, delete. File systems typically come with metadata such as permissions and owners.
  • Block storage - you get raw disk access but need to layout your binary data manually and in fixed block sizes.

Standard File Systems

File Systems
Name Snapshots RAID Checksumming Compression CoW Erasure coding Encryption
BTRFS[1] Yes, Writable Yes[2] Yes Yes Yes Unstable No
ZFS Yes[3], Writable[4] Drive-level Yes Yes Yes Yes Yes
EXT4 No No No No No - No
XFS No No No No No - No
bcachefs[5] Yes Yes Yes Yes Yes Unstable Yes

Notes:

  • For single drives/blocks, I prefer BTRFS for it's feature set.
  • For multiple drives, ZFS is often preferred for it's reliability.
  • bcachefs is still under development

For multi-drive deployment, my preferences are:

  • If you have multiple same-sized disks and no need for expansion, use ZFS raid.
  • If you have different sized disks, want maximum storage, and don't need live parity then use snapraid + btrfs + mergerfs.
  • If you need real-time parity and expansion and don't mind slow rebuilds, use mdraid + btrfs.

Windows: 1. NTRFS 2. ReF

Overlay File Systems

  • MergerFS - a union file system to combine multiple folders on a single computer.

Block Overlays

The create a view of one or more block storage, typically using one or more block storage.

  • LUKS - encrypts a partition
  • LVM - joins multiple blocks into a pool from which to allocate blocks
  • mdraid

Object Stores

  • Minio - S3-compatible object store
  • Ceph - joins drives across multiple computers. Has block, file, and object storage APIs.
  • Rook - deployment of Ceph using Kubernetes
  • SeaweedFS - joins drives across multiple computers to object storage APIs (incl. S3). Has file storage when paired with a database using the SeaweedFS Filer.

Distributed File Systems

  • GlusterFS - joins filesystem directories across multiple computers
  • Ceph - joins drives across multiple computers. Has block, file, and object storage APIs.
  • JuiceFS - creates a POSIX-compatable file storage using an S3 object storage and metadata database.

Databases

SQL

  • PostgreSQL
  • MySQL
  • SQLite

NoSQL

  • MongoDB

Cloud Providers

See Cloud Providers

  1. ↑ https://btrfs.readthedocs.io/en/latest/Introduction.html
  2. ↑ https://btrfs.readthedocs.io/en/latest/Volume-management.html
  3. ↑ https://docs.oracle.com/cd/E19253-01/819-5461/gbcya/index.html
  4. ↑ https://docs.oracle.com/cd/E19253-01/819-5461/gbcxz/index.html
  5. ↑ https://bcachefs.org/
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