Setup ZFS on Ubuntu server 14.04

Install zfs on Ubuntu

sudo add-apt-repository ppa:zfs-native/stable
sudo apt-get update
sudo apt-get install ubuntu-zfs
sudo zfs list

Check your drive info

sudo smartctl -i /dev/sda
sudo hdparm -I /dev/sda
sudo hdparm -I /dev/sda | grep 'Serial Number'

Label your drives!

sudo fdisk -l

sudo lsblk --nodeps -o name,serial
sudo lsblk --nodeps -o name,model,serial,size
sudo lsblk --nodeps -o name,model,serial,size,tran
sudo lsblk --nodeps -no serial /dev/sda

sudo lshw -class disk -short
sudo lshw -class disk | less
sudo lshw -short

For freebsd

gpart show
gpart show adax
camcontrol identify adax
glabel status
egrep 'ad[0-9]|cd[0-9]' /var/run/dmesg.boot
atacontrol list
camcontrol devlist

 

Create a zfs pool (striped)

RAID 0 (-f overrides any errors due to existing file system)

sudo zpool create -f myPoolZFS /dev/sdx /dev/sdxx /dev/sdxxx

 

Create a zfs pool (raidz = RAID 5)

RAID 5 (raidz)

sudo zpool create -f myPoolZFS raidz /dev/x /dev/xx /dev/xxx

Confirm your zfs pool

sudo zpool status
df -h

 

Create a dataset in the pool

sudo zfs create pool_name/directory_name

Setting Quotas

sudo zfs set quota=100G myPoolKim/iSCSI
sudo zfs get quota myPoolKim/iSCSI

 

Take snapshots

sudo zfs snapshot myPoolKim/iSCSI@xxxx-xx-xx

View snapshots

sudo zfs list -t snapshot
sudo zfs list -t snapshot -r -o name,creation

You can access them physcially

ls /myPoolKim/iSCSI/.zfs/snapshot/

View space used for snapshots

zfs list -o space

 

Rollback snapshots

To roll back to an earlier snapshot, all intermediate snapshots must be destroyed.

sudo zfs rollback myPoolKim/iSCSI@xxxx-xx-xx

 

Maintenance

Start scrubbing and see the status or stop scrub

sudo zpool scrub PoolName
sudo zpool status PoolName
sudo zpool scrub -s PoolName

 

You need to destroy existing pool if you do not have enough drives to play

sudo zpool destroy myPoolZFS

 

Adding more drives to your pool for more storage

sudo zpool add -f myPoolZFS raidz /dev/y /dev/yy /dev/yyy

 

Check increased storage space & iostat 

sudo zpool status && df -h
zpool iostat -v 5 5

 

 #Getting all parameters

sudo zfs set quota=50M PoolName
sudo zfs set quota=none PoolName/Apache
sudo zfs set compression=lzjb PoolName/apache

sudo zfs get compressratio PoolName/apache
sudo zfs get compress PoolName
sudo zfs get all PoolName

 

How to replace a dead drive

Offline the dead drive and insert a new drive

sudo zpool offline Poolname DeadDeviceName
sudo zpool online PoolName DeadDeviceName

Replace a dead drive with new one (on the same slot)

zpool replace PoolName DeadDeviceName
zpool replace PoolName 16201382842022959672X adaX

Replace a dead drive with new one (if you have inserted extra new drive on another port or HBA)

zpool replace PoolName DeadDeviceName NewDeviceName

Replace a dead drive with larger one

#You must replace all drives in the RAID to enjoy larger drives
sudo zpool set autoexpand=on PoolName
sudo zpool replace PoolName DeadDrive NewBiggerDrive

If you wish to improve performance of your zfs pool

sudo zpool add PoolName cache /dev/ssd1 /dev/ssd2
sudo zpool add PoolName log mirror /dev/ssd1 /dev/ssd2

 

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