You can allocate clone capacity for a single-tier LUN and create a schedule Clone LUN to perform clone operations on a regular basis. The Data Protection page also allows you to use custom QoS settings for your clones or use the LUN settings.
After the clone is created, you can change the priority level and other properties of the clone. When creating a Clone LUN, make sure that enough repository space exists for the clone. The system stores in the clone repository only the changes that are made to the source volume or to the clone.
- Navigate to .
- Select .
- Click Single Tier.
- Click the Data Protection tab.
- To allow the system to create Clone LUNs, select the Enable Clones check box.
Result:Selecting this option enables the remaining options on the page.
- In the Maximum Capacity field, enter a value for the Capacity for Clone Storage. The system sets a default of 110% of the LUN storage capacity. Selecting a value of 100% provides enough capacity to avoid strict control over the storage capacity without using up unnecessary capacity.
Caution
Allocate sufficient repository or clone storage capacity to minimize the chances of running out of this space (which could lead to data inconsistency or loss). To set sufficient capacity, use a value equal to the source volume capacity multiplied by the number of replicas multiplied by the maximum rate of change. For example, for a 100 GB volume that is projected to have 20 active replicas at a time and no more than a 20% rate of change, use a value of 400 GB for the storage capacity.
- (Optional) Select the Match Repository QoS to LUN QoS check box.
Result:Selecting the Match Repository QoS to LUN QoS option applies the LUN QoS properties to the clones and disables the Clone Storage QoS fields.
- (Optional) From the Storage Domain list, select the Storage Domain that you want to assign the LUN.
- Select the Storage Class where you want to store the LUN.
Possible classes:
Capacity Disk
Capacity SSD
Performance Disk
Performance SSD
- (Optional) Select the Basic link.
Result:The indirect
QoS properties display. Available selections:
Typical Access
I/O Bias
Redundancy
- (Optional) From the Typical Access list, select the common access method for this LUN.
Available access methods:
- (Optional) From the I/O Bias list, select the typical read‑write ratio for this LUN.
- (Optional) From the Redundancy list, select the number of parity bits to copy for this LUN.
- (Optional) Select the Advanced link.
Result:The direct
QoS properties display. Available selections:
Important! Selecting Advanced QoS properties clears the Basic QoS selections.
- (Optional) From the RAID Level list, select the RAID level to associate with this LUN.
Possible RAID levels:
Single Parity
Double Parity
Mirrored
- (Optional) From the Priority Level field, select the desired option for the LUN.
Valid choices:
Premium
High
Medium
Low
Archive
- (Optional) To create a Clone LUN data protection schedule, click Create.
See the procedure for creating Clone LUNs on a scheduled basis.
- (Optional) Click OK.
Clicking
OK creates the
LUN using the default settings on the remaining tabs. You can perform the tasks associated with the other tabs to fine‑tune the remaining
LUN properties. The default properties include:
The LUN is assigned to the default Volume Group and the default Storage Domain.
The LUN is mapped to the same host entry as the most recent LUN mapping.
The system does not create repository capacity for Clone LUNs.
The system does not create schedules for automatic Clone LUNs.