ZFS and Btrfs offer snapshots, checksums, and optional RAID. ZFS is mature and common on FreeBSD and some Linux; Btrfs is in the kernel. Both need adequate RAM. Check provider support before deploying.
ZFS
- Features: Copy-on-write, snapshots, checksums, compression, and built-in RAID (mirror, RAIDZ). Data integrity and easy rollback.
- Platform: Native on FreeBSD; on Linux via ZFS-on-Linux (OpenZFS). Some providers support it; others do not or use custom kernels. Check before you commit.
- RAM: Uses RAM for ARC (cache). Plan for enough memory; very large pools may need tuning.
Btrfs
- Features: Copy-on-write, snapshots, checksums, compression, and RAID (0/1/10). Integrated in the Linux kernel. Good for flexible volume management.
- Maturity: Improving; some workloads have been stable for years. Check compatibility with your distro and kernel. Avoid RAID 5/6 in older kernels (bugs).
- RAM: Also uses memory; typically less than ZFS for similar workloads but still plan adequately.
When to use
- Snapshots and integrity: Both give you quick snapshots and checksums. Useful for backups, rollback, and detecting bit rot.
- Provider support: Not all hosts support ZFS or Btrfs on their images. Verify and test in staging before production.
- Alternatives: If unsupported, use LVM + ext4/XFS with external snapshot/backup tools.
Summary
ZFS and Btrfs offer snapshots, checksums, and optional RAID. Both need adequate RAM; check provider support. Choose by platform (FreeBSD/Linux) and maturity needs.
