ZFS Zettabyte File System
Advantages:
Zpool Capacity of 256 zettabytes (1ZB = 1000^7 bytes = 10^21 bytes)
Encryption
Data Integrity
Integrated Volume Management
Software RAID:
Striped (RAID0)
Mirrored (RAID1)
Striped Mirrored (RAID10)
RAIDZ (RAID5-Single parity)
RAIDZ2 (RAID6-Double parity)
RAIDZ3 (Triple Parity)
Snapshots and Clones
Disadvantage:
No way to reduce the zpool capacity
ZFS has only two commands: zpool and zfs.
The zpool command creates, modifies, and destroys ZFS pools.
The zfs command creates, modifies, and destroys ZFS file systems.
# zpool help
The following commands are supported:
add attach clear create destroy detach export get
help history import iostat list offline online remove
replace scrub set split status upgrade
# zfs help
The following commands are supported:
allow clone create destroy diff get
groupspace help hold holds inherit list
mount promote receive release rename rollback
send set share snapshot unallow unmount
unshare upgrade userspace
zpool Command Examples
Check Existing pools, status, and iostat:
root@Ferdy-Sol11:~# zpool list
NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT
rpool 19.6G 8.09G 11.5G 41% 1.00x ONLINE -
root@Ferdy-Sol11:~# zpool status
pool: rpool
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
c1t1d0s1 ONLINE 0 0 0
errors: No known data errors
root@Ferdy-Sol11:~# zpool iostat -lv
capacity operations bandwidth
pool alloc free read write read write
---------- ----- ----- ----- ----- ----- -----
rpool 8.14G 11.5G 1 0 116K 4.00K
c1t1d0s1 8.14G 11.5G 1 0 116K 4.00K
---------- ----- ----- ----- ----- ----- -----
Check for Error:
# zpool scrub Pool_Name
zpool scrub rpool
Create a RAIDZ pool named raidzpool
First, list the available disks by using the formant command
root@Ferdy-Sol11:~# format
Searching for disks...done
AVAILABLE DISK SELECTIONS:
0. c1t1d0
/pci@0,0/pci8086,2829@1f,2/disk@1,0
1. c1t2d0
/pci@0,0/pci8086,2829@1f,2/disk@2,0
2. c1t3d0
/pci@0,0/pci8086,2829@1f,2/disk@3,0
3. c1t4d0
/pci@0,0/pci8086,2829@1f,2/disk@4,0
Specify disk (enter its number): ^Z
root@Ferdy-Sol11:~# zpool create datapool raidz1 c1t2d0 c1t3d0 c1t4d0
root@Ferdy-Sol11:~# zpool status datapool
pool: datapool
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
datapool ONLINE 0 0 0
raidz1-0 ONLINE 0 0 0
c1t2d0 ONLINE 0 0 0
c1t3d0 ONLINE 0 0 0
c1t4d0 ONLINE 0 0 0
zfs Command Examples
List all ZFS file system
# zfs list
Create ZFS dataset
root@Ferdy-Sol11:~# zfs create datapool/vol1
root@Ferdy-Sol11:~# zfs list | grep datapool
datapool 165K 39.0G 36.0K /datapool
datapool/vol1 34.6K 39.0G 34.6K /datapool/vol1
Mount and Unmount all ZFS file systems:
# zfs mount -a
# zfs umount -a
Create a snapshot named 5May2016 of the vol1 dataset
# zfs snapshot datapool/vol1@5May2016