meta data for this page
This is an old revision of the document!
| Feature | ZFS | BTRFS | remarks |
|---|---|---|---|
| License | CDDL | GPL | |
| Copy-on-write | Yes | Yes | |
| Checksums | Yes | Yes | |
| Encryption | |||
| Online defragmentation | Yes | ||
| Online growing / shrinking | Yes | ||
| Online block dev add/rem | Yes(-) | Yes | ZFS: only mirrored devices can be removed |
| Online deduplication | block | No | ZFS: planned |
| Online compression | Yes | Yes | similar compression level |
| Subvolumes | Yes | Yes | |
| Subvolumes inside subvol. | Yes | Yes | |
| Linux root filesystem | ? | Yes | |
| Striping | |||
| Mirroring |
Check and compare:
- online convert from RAID0 to RAID1
- direct mounting subvolumes (btrfs: by subvol path or subvol ID)
- file snapshot (btrfs: cp –reflink /mnt/sv1/test1 /mnt/sv1/test3)
- ZFS: online defrag
- btrfs: convert from ext4 (btrfs-convert /dev/sdb1) and rollback
- btrfs as root
ZFS:
- (+) All features are controlled by subvolumes (datasets) attributes (compression, deduplication)
- (-) CDDL license is not compatible with Linux kernel. Cannot be distributed as derived work.
- (-) Only mirrored block devices can be removed.
- (-) Deduplication on block level, cannot find shifted blocks.
BTRFS:
- (-) All features controlled by mount options
- (+) Every block device can be removed, data are automatically copied (balanced) to free space on other devices
- (+) Metadata are automatically duplicated between block devices, data are striped