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Project and Share Properties
LUN Local Properties
These properties apply only to LUNs and are not inherited. They cannot be set on projects.
Volume size
The volume size property is the logical size of the LUN as exported over iSCSI. This property
controls the size of the LUN. By default, LUNs reserve enough space to completely fill the
volume. Changing the size of a LUN while actively exported to clients may yield undefined
results. It may require clients to reconnect and/or cause data corruption on the filesystem on
top of the LUN. Check best practices for your particular iSCSI client before attempting this
operation.
Thin provisioned
The thin provisioned property controls whether space is reserved for the volume. By default, a
LUN reserves exactly enough space to completely fill the volume. This ensures that clients will
not get out-of-space errors at inopportune times. This property allows the volume size to exceed
the amount of available space. When set, the LUN will consume only the space that has been
written to the LUN. While this allows for thin provisioning of LUNs, most filesystems do not
expect to get "out of space" from underlying devices, and if the share runs out of space, it may
cause instability and/or data corruption on clients.
When not set, the volume size behaves like a reservation excluding snapshots. It therefore has
the same pathologies, including failure to take snapshots if the snapshot could theoretically
diverge to the point of exceeding the amount of available space. For more information, see the
Reservation property in
"Managing Filesystem and Project Space" on page
397.
Volume block size
The volume block size property sets the native block size for LUNs. This can be any power of
2 from 512 bytes to 1M, and the default is 8K. This property is static; it is set when the LUN is
created and cannot be changed.
Other Properties
The following properties are available: Project Default, Filesystem Local, Space Management,
Read-only, and Custom.
Shares and Projects
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