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If you ever used ZFS on a LUN and then tried to reuse that LUN for UFS you might have noticed a “weird” disk label on it. This is known as EFI label.

Here is how it looks in format command:

partition> p
Current partition table (original):
Total disk sectors available: 73383902 + 16384 (reserved sectors)

Part Tag Flag First Sector Size Last Sector
0 usr wm 34 34.99GB 73383902
1 unassigned wm 0 0 0
2 unassigned wm 0 0 0
3 unassigned wm 0 0 0
4 unassigned wm 0 0 0
5 unassigned wm 0 0 0
6 unassigned wm 0 0 0
8 reserved wm 73383903 8.00MB 73400286

If you use straight format command there is no way to get rid of EFI label. Instead, you have to use -e option with format to get to expert features:

bash-3.00# format -e

With -e options when you label the LUN you will be asked about the type of label you want to put on the disk:

format> label
[0] SMI Label
[1] EFI Label
Specify Label type[1]: 0
Warning: This disk has an EFI label. Changing to SMI label will erase all
current partitions.
Continue? y
Auto configuration via format.dat[no]? yes

I suppose you could alternatively use dd command and blank out the whole disk. Continue Reading

Create simple striped pool:
zpool create [pool_name] [device] [device] ...
zpool create datapool c5t433127A900011C370000C00003210000d0 c5t433127B4001031250000900000540000d0

Create mirrored pool:
zpool create [pool_name] mirror [device] [device] ...
zpool create datapool mirror c5t433127A900011C370000C00003210000d0 c5t433127B4001031250000900000540000d0

Create Raid-Z pool:
zpool create [pool_name] raidz [device] [device] [device] ...
zpool create datapool raidz c5t433127A900011C370000C00003210000d0 c5t433127B4001031250000900000540000d0 c5t439257C4000019250000900000540000d0

Transform simple pool to a mirror:
zpool create [pool_name] [device]
zpool attach [pool_name] [existing_device] [new_device]
zpool create datapool c5t433127A900011C370000C00003210000d0
zpool attach datapool c5t433127A900011C370000C00003210000d0 c5t433127B4001031250000900000540000d0

Expand simple pool:
zpool create [pool_name] [device]
zpool add [pool_name] [new_device]
zpool create datapool c5t433127A900011C370000C00003210000d0
zpool add datapool c5t433127B4001031250000900000540000d0

Expand mirrored pool by attaching additional mirror:
zpool add [pool_name] mirror [new_device] [new_device]
zpool add datapool mirror c5t433127A900011C370000C00003460000d0 c5t433127B400011C370000C00003410000d0

Replace device in a pool:
zpool replace [pool_name] [old_device] [new_device]
zpool replace datapool c5t433127A900011C370000C00003410000d0 c5t433127B4001031250000900000540000d0

Destroy pool:
zpool destroy [pool_name]
zpool destroy datapool

Set pool mountpoint:
zfs set mountpoint=/path [pool_name]
zfs set mountpoint=/export/zfs datapool

Display configured pools:
zpool list
zpool list

Display pool status info:
zpool status [-v] [pool_name]
zpool status -v datapool

Display pool I/O statistics:
zpool iostat [pool_name]
zpool iostat datapool

Display pool command history:
zpool history [pool_name]
zpool history datapool

Export a pool:
zpool export [pool_name]
zpool export datapool

Import a pool:
zpool import [pool_name]
zpool import datapool

Create a filesystem:
zfs create [pool_name]/[fs_name]
zfs create datapool/filesystem

Destroy a filesystem:
zfs destroy [pool_name]/[fs_name]
zfs destroy datapool/filesystem

Rename a filesystem:
zfs rename [pool_name]/[fs_name] [pool_name]/[fs_name]
zfs rename datapool/filesystem datapool/newfilesystem

Move a filesystem:
zfs rename [pool_name]/[fs_name] [pool_name]/[fs_name]/[fs_name]
zfs rename datapool/filesystem datapool/users/filesystem

Display properties of a filesystem:
zfs get all [pool_name]/[fs_name]
zfs get all datapool/filesystem

Make a snapshot:
zfs snapshot [pool_name]/[fs_name]@[time]
zfs snapshot datapool/filesystem@friday

Roll back filesystem to its snapshot:
zfs rollback [pool_name]/[fs_name]@[time]
zfs rollback datapool/filesystem@friday

Clone a filesystem:
zfs snapshot [pool_name]/[fs_name]@[time]
zfs clone [pool_name]/[fs_name]@[time] [pool_name]/[fs_name]
zfs snapshot datapool/filesystem@today
zfs clone datapool/filesystem@today datapool/filesystemclone

Backup filesystem to a file:
zfs send [pool_name]/[fs_name] > /path/to/file
zfs send datapool/filesystem@friday > /tmp/filesystem.bkp

Restore filesystem from a file:
zfs receive [pool_name]/[fs_name] < /path/to/file
zfs receive datapool/restoredfilesystem < /tmp/filesystem.bkp

Create ZFS volume:
zfs create -V [size] [pool_name]/[vol_name]
zfs create -V 100mb datapool/zvolume
newfs /dev/zvol/dsk/datapool/zvolume Continue Reading