Table of Contents
An emulated volume is a dataset that represents
a block device and can be used like any block device. ZFS volumes are identified
as devices in the /dev/zvol/{dsk,rdsk}/path directory.
In the following example, 5-Gbyte ZFS volume, tank/vol,
is created:
# zfs create -V 5gb tank/vol
When you create a volume, a reservation is automatically set to the initial size of the volume. The reservation size continues to equal the size of the volume so that unexpected behavior doesn't occur. For example, if the size of the volume shrinks, data corruption might occur. You must be careful when changing the size of the volume.
If you are using a Solaris system with zones installed, you cannot create or clone a ZFS volume in a non-global zone. Any attempt to create or clone a volume from within a non-global zone will fail. For information about using ZFS volumes in a global zone, see Adding ZFS Volumes to a Non-Global Zone.
To set up a swap area, create a ZFS volume of a specific size and then enable swap on that device. Do not swap to a file on a ZFS file system. A ZFS swap file configuration is not supported.
In the following example, the 5-Gbyte tank/vol volume
is added as a swap device.
#swap -a /dev/zvol/dsk/tank/vol#swap -lswapfile dev swaplo blocks free /dev/dsk/c0t0d0s1 32,33 16 1048688 1048688 /dev/zvol/dsk/tank/vol 254,1 16 10485744 10485744
Using a ZFS volume as a dump device is not supported. Use the dumpadm command to set up a dump device.