ZFS

ZFS (2006) is a combined file system and volume manager included in Solaris 10 update 2 (06/2006) and Ubuntu 16.04 LTS onwards. ZFS support advances features such as

• Data integrity
• Integrated volume management – zpool (pooled storage)
• Copy on Write (CoW)
• Compression (zfs set compression=off your_pool/filesystem (or just zfs set compression=off your_pool, zpool get all)
• Snapshots and clones
• Deduplication: zfs set dedup=on POOL_NAME/FS_NAME
• Quotas: zfs set quota
• Solaris: Online shrink zpool remove in Solaris 11.4 released in August 2018

Commands: zfs, zpool, zdb

• Ubuntu Installation: sudo apt install zfsutils-linux

Configuration files

• /etc/default/zfs

Commands

• List your block/disk devices: lsblk or lsblk -f or fdisk -l

• Show pool status: zpool status
• List ZFS pools : zpool list

zpool list -v

• zfs mount -a
• zfs umount

• Create a new pool: zpool create

To Modify Disk identification to use disk/by-id:

• zpool export DATA
• zpool import -d /dev/disk/by-id DATA
• Verify: zdb -C

Pools

• zpool destroy YOUR_POOL
• Show pool status: zpool status
• List ZFS pools : zpool list

Filesystems

• Create a new filesystem: sudo zfs create DATA/datafs
• Destroy a zfs filesystem: sudo zfs destroy DATA/datafs_TO_DESTROY (Warning: no confirmation requested)
  • sudo zfs destroy -r DATA/datafs_TO_DESTROY
• Set a quota to a filesystems: zfs set quota=50G pool/home/bob
• Check zfs service status: systemctl status "zfs*" "zpool*"
• Display configuration information: zdb -C

List information

• Show pool status: zpool status
• List ZFS pools : zpool list
• List FS/Volumens/snapshots: zfs list
• zpool get all
• zfs get all

zfs get all | grep mountpoint

zfs get all | grep dedup

Advanced

• zpool import

Activities

1. Read selecting dev names when creating a pool before you create your first ZFS pool: https://github.com/zfsonlinux/zfs/wiki/FAQ#selecting-dev-names-when-creating-a-pool and https://wiki.archlinux.org/index.php/Persistent_block_device_naming
2. Read ArchLinux documentation about ZFS: https://wiki.archlinux.org/index.php/ZFS#Creating_a_storage_pool
3. Follow Ubuntu Tutorial about Setup a ZFS storage pool: https://tutorials.ubuntu.com/tutorial/setup-zfs-storage-pool#0
4. Create you first ZFS pool: zpool create

Medium

1. Read about ZFS rm "expensive" operations: https://serverfault.com/a/801080, even more so if deduplication is enabled.

Related terms

• z_fr_iss

See also

• ZFS: ZFS deduplication, ZFS snapshot, zfs list, zpool status, zpool create, zfs create, zfs get all, zfs set, zfs mount, zfs umount, zfs rollback
• LVM
• Proliant
• smartctl
• File systems: ext4, XFS, ZFS, btrfs, wipefs, findfs, HDFS, overlay, aufs, virt-filesystems, Windows: (FAT, NTFS, ReFS), GPFS, squashfs, Ecryptfs, Encfs, FUSE, VMFS, Comparison of distributed file systems, Userspace filesystem, Resize filesystem size
• Solaris

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Original Source: https://en.wikiversity.org/wiki/Linux_Administration/Devices_and_Filesystems/ZFS