Features of the owning controller

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1. Each LUN belongs to only one owning controller.
2. The host can read and write data on the LUN not by the owning controller, but the mirroring channel between the controllers must be used.

Other related questions:
Whether the primary and secondary LUNs must have the same owning controller in the clone feature
The primary and secondary LUNs must have the same owning controller in the clone feature.

Method used to switch the owning controller of a LUN
You can switch the owning controller of a LUN as follows: The following method is used in the storage system when dual controllers run properly and a board is inserted and removed online without service interruption. 1. Check the owing controller of the LUN and perform switchover (controller B is used as an example). For subtending boards, perform operations on relevant LUNs on them. Log in to the primary controller. Check the primary and secondary controllers in CLI mode by logging in to the CLI mode and running the showmaster command. Query the owing controller that backs up the LUN by logging in to the CLI mode and entering showlun. Switch the LUN by switching LUN1 (LUN-ID 1) from controller B to controller A and entering OceanStor: admin> chglun -i 1 -c a in CLI mode. Command format: chglun -i LUN-ID -c controller-ID 2. Switch the LUN back to the original owing controller. Note: After the board is inserted, switch the owing controller of the LUN to the original one.

Method used to change owning controllers of LUNs
1. For a RAID group consisting of SATA disks, it is recommended that LUNs in the same RAID group be configured with the same owning controller. For a RAID group consisting of other types of disks, it is recommended that LUNs in the same RAID group be allocated to different owning controllers. 2. Go to the Modify LUN dialog box. In the ISM navigation tree, choose All Devices > SN_XX > Storage Resources > LUN. (SN_XX is the name of the target storage system.) In the right function pane, select the LUN you want to modify. Click Modify. The Modify LUN dialog box is displayed. Modify the basic and advanced attributes of the LUN.

Method used to switch owning controllers of LUNs
When member disks in the RAID group where the LUN resides are SATA/NL-SAS disks, you need to set all LUNs in the same RAID group to the same owning controller. If there are multiple RAID groups whose member disks are SATA/NL-SAS disks, evenly distribute LUNs in each RAID group to different controllers. When member disks in the RAID group where the LUN resides are SAS/FC/SSD, you need to evenly distribute all LUNs in the same RAID group to different controllers. 1.Open the Modify LUN dialog box. In the ISM navigation tree, choose All Devices > All Devices > SN_XX > Storage Resources > LUN. (SN_XX indicates the name of the target storage system.) In the ISM information display area, select the LUN to be modified. Click Modify. The Modify LUN dialog box is displayed. Note: In the Modify LUN dialog box, you can modify the owning controller of the LUN and attributes such as the LUN name, prefetch policy, and write policy. 2. In the Owning Controller dialog box, select the owning controller to be set. 3. Confirm the modification of the LUN's general attributes. Click OK. The Information dialog box is displayed, indicating that the operation is successful. Click OK to return to the LUN management page. Modification to the owning controller is completed.

Whether LUNs of OceanStor V3 storage systems have owning controllers
OceanStor V3 LUNs have owning controllers. However, the LUNs can be accessed from any controller.

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