The volumes on your ReadyDATA can be divided into shares and logical unit numbers (LUNs), both of which are logical entities on one or more disks.
Shares are NAS data sets that allow data transfer and storage over SMB, NFS, AFP, and FTP. For more information about these protocols, see the What file-sharing protocols are supported by my ReadyDATA storage system?
Fig. Share icon
Shares and LUNs enable you to organize data in a volume by type, group, user, department, and so on. Within one volume, you can create multiple shares and LUNs, each one with its own specific configuration.
Each share has a configuration that is independent of other shares that reside on the same volume. A share configuration includes settings such as logbias, compression, deduplication (referred to as dedupe), protection, file-sharing protocols, and access rights. These settings are explained in the following sections.
The configuration settings of a share are stored in the volume (that is, in the pool) in which the share resides. This design allows a share to be portable when a disk is moved from one array to another array. You can specify whether a snapshot is created, and with what frequency it is created.
You can specify the size of a share in two ways:
-
Undefined. The entire nonreserved storage space on the volume is available to the share. Storage space is assigned on demand instead of up front. This method greatly improves the utilization rate of the share because storage space is assigned only as data is written to the share. The size of the share is reported as the entire nonreserved storage space on the volume. As data is written to the share, the used storage space is displayed on the volume icon in purple.
-
Quota. You set a quota for the share. All storage space that you specify when you create the share is also allocated up front. The share size cannot grow beyond the quota, but you can increase the quota. The size of the share is reported as the quota that you specify. As data is written to the share, the used storage space is displayed on the volume icon in purple.
Although the quota of an individual share cannot exceed the size of the volume, a volume allows oversubscription: the aggregate quota of the shares on a volume can exceed the size of the volume. Taking reserved storage space into account, storage space is assigned on demand.
In addition, whether you set a quota or not, you can reserve share storage space to guarantee that storage space is available on the volume. Snapshots, other shares, and LUNs on the volume cannot consume storage space that is reserved. The reserved storage space is displayed on the volume icon in orange.
The following table explains the default settings of a share. You can change these settings when you create or change the share.
|
Item |
Default State |
|
Logbiasa |
Latency |
|
Compression |
Disabled |
|
Dedupe |
Disabled |
|
Protection |
Continuous |
|
Interval |
Daily |
|
Size |
No limitation |
|
Access |
Denied until you set permissions |
a. You can change the logbias only when you change the properties of a share.