The management GUI contains a series of pre-established configuration options called presets. Presets are commonly used settings to quickly configure objects on the system.
Presets are available for creating volumes, setting FlashCopy® mappings, and establishing RAID levels for array configurations.
| Preset | Purpose |
|---|---|
| Basic | Creates a single volume copy on one site. |
| Mirrored | Creates copies of a volume that exist on one site. |
| Custom | Creates volumes with customized properties. |
| Preset | Purpose |
|---|---|
| Backup | Creates a point-in-time replica of the production
data. After the copy completes, the backup view can be refreshed from
the production data, with minimal copying of data from the production
volume to the backup volume. This preset automatically creates a volume with the same properties as the source volume. The preset creates an incremental FlashCopy mapping with a background copy rate of 50. |
| Clone | Creates an exact replica of the volume,
which can be changed without affecting the original volume. After
the copy operation completes, the mapping that was created by the
preset is automatically deleted. This preset automatically creates a volume with the same properties as the source volume and creates a FlashCopy mapping with a background copy rate of 50. The FlashCopy mapping is configured to automatically delete itself when the FlashCopy mapping reaches 100% completion. |
| Snapshot | Creates a point-in-time view of the production
data. The snapshot is not intended to be an independent copy but is
used to maintain a view of the production data at the time that the
snapshot is created. This preset automatically creates a thin-provisioned target volume with 0% of the capacity allocated at the time of creation. The preset uses a FlashCopy mapping with 0% background copy so that only data written to the source or target is copied to the target volume. |
Array configuration presets are used to configure all available drives in an array, based on the recommended values for the RAID level and drive class.The system determines the drive class by detecting information about all of the installed hardware, such as the technology, speed, capacity, block size, and I/O group. To display information about all of the drive classes that are available on the system, issue the lsdriveclass command.
The system then recommends a configuration that uses all of the drives to build arrays that are protected with the appropriate number of rebuild areas or spare drives. Use the lsarrayrecommendation command to display the system recommendations for an array configuration and the expected storage pool capacity. In the command output, the first row of information that is displayed shows the default values the management GUI uses to create the configuration.
To maintain redundancy, each preset creates a specific number of drives per array and number of spare drives or rebuild areas. Presets also determine whether the drives in the array are balanced across enclosure chains to protect the array from enclosure failures.
| Preset | Purpose | RAID level | Drives per array | Spare drives |
|---|---|---|---|---|
| RAID 0 | Provides no protection against drive failures. Use only for temporary volumes. | 0 | 8 | 0 |
| RAID 1 | Mirrors data to provide good performance and protection against drive failure. The mirrored pairs are spread between storage pools to be used for the Easy Tier function. | 1 | 2 | 1 |
| RAID 5 | Protects against a single drive failure. Data and one strip of parity are striped across all array members. | 5 | 8 | 1 |
| RAID 6 | Protects against two drive failures. Data and two strips of parity are striped across all array members. | 6 | 10 | 1 |
| RAID 10 | Provides good performance and protects against at least one drive failure. All data is mirrored on two array members. | 10 | 8 | 1 |
Note: In all RAID instances, drives
in the array are balanced across enclosure chains if possible.
|
||||
| Preset | Purpose | RAID level | Drives per array | Rebuild areas |
|---|---|---|---|---|
| Distributed RAID 5 | Protects against a single drive failure. Data, one parity strip, and the rebuild area are striped across all array members. | 5 | Up to 35 | 1 |
| 36 - 72 | 2 | |||
| Distributed RAID 6 | Protects against two drive failures. Data, two parity strips, and the rebuild area are striped across all array members. | 6 | 73 - 100 | 3 |
| 101 - 128 | 4 |