ZFS file system

Intro

According to wikipedia, ZFS stand for Z File System, which is an open source file system and a logical volume manager licensed under the Common Development and Distribution License.

Designed by Sun Microsystems (acquired by Oracle in 2009), and had been developed by Jeff Bonwick.

Main features

• High storage capacity
• Volume management
• Data integrity
• Snapshots and clones
• Deduplication
• Compression

Configuration

• OS : Debian Jessie 8.0

Installing

Follow instructions for Debian on zfsonlinux website : https://github.com

Commands

Create a ZFS pool

Get disks ids

root@host:~# ls -lah /dev/disk/by-id/

Create mount point

root@host:~# mkdir /zfs

Create RAID 0

root@host:~# zpool create -f -m <mount_point> <pool_name> <type> <ids>

root@host:~# zpool create -f -o ashift=12 -m /zfs raid0_01 mirror scsi-SATA_WDC_WD20EARS-07_WD-WCAZA796741 scsi-SATA_WDC_WD20EARS-07_WD-WCAZB7569258 scsi-SATA_WDC_WD20EARS-07_WD-WCPZB7464217

• create : Crate pool
• -f : Force pool creation. (Avoid "EFI label error" error).
• -o ashift=12 : align zpool on clusters size (current disks work with 4K or 8k not with 512k).
• -m : Mounting point. / by default.
• pool_name : Pool name.
• type : Pool type. Example : mirror (raid0), raidz3, raidz2 etc...
• ids : Disks names included inside the pool (see /dev/disk/by-id directory).

Add a hot disk spare

root@host:~# zpool add tank spare ada12

List pools

root@host:~# zpool list

Print commands pool history

root@host:~# zpool history raid0_01

Change pool mount point

root@host:~# zfs set mountpoint=/zfs raid0_01

If the zfs volume doesn't mount on new system

root@host:~# zpool export raid0_01

root@host:~# zpool import -a

• Or

root@host:~# zpool import -f raid0_01

Disable atime

root@host:~# zfs set atime=off <pool>

Enable lz4 compression

root@host:~# zfs set compression=lz4 <pool>

Maintenance

Datas check (chkdsk equivalent)

root@host:~# zpool scrub raid0_01

• Print datas check status

root@host:~# zpool status

Print options

root@host:~# zfs get all <pool>

Monitoring

Print every pool informations

root@host:~# zpool get all raid0_01

Print partition state

root@host:~# zpool status -v raid0_01

Print IOs informations

root@host:~# zpool iostat <second rate> <output number>

root@host:~# zpool iostat 5 10

Encryption with dm-crypt

Disks encryption

root@host:~# cryptsetup --cipher aes-xts-plain64 --key-size 512 --hash sha1 --iter-time 1000 --use-urandom -v luksFormat /dev/sdb1

root@host:~# cryptsetup --cipher aes-xts-plain64 --key-size 512 --hash sha1 --iter-time 1000 --use-urandom -v luksFormat /dev/sdc1

root@host:~# cryptsetup --cipher aes-xts-plain64 --key-size 512 --hash sha1 --iter-time 1000 --use-urandom -v luksFormat /dev/sdd1

Open encrypted disks

root@host:~# cryptsetup luksOpen /dev/sdb1 zfs01

root@host:~# cryptsetup luksOpen /dev/sdc1 zfs01

root@host:~# cryptsetup luksOpen /dev/sdd1 zfs01

ZFS pool creation

root@host:~# zpool create -f -m /zfs raid0_01 mirror /dev/mapper/zfs01 /dev/mapper/zfs02 /dev/mapper/zfs03

source : linuxfr.org

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