Method used to map a LUN larger than 2 TB to a server

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The storage system can create a LUN larger than 2 TB. Before a LUN larger than 2 TB is mapped to the host, check whether the host operating system can identify the LUN.

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Method used to check newly mapped LUNs on the server not installed with the multipathing software
Method used to check newly mapped LUNs on the server not installed with the multipathing software: 1. Log in to the application server. 2. Run cd /sys/class/scsi_host/ to enter the /sys/class/scsi_host/ directory. # cd /sys/class/scsi_host/ 3. Run ls to check the HBA card port in the /sys/class/scsi_host/ directory (for example, host0, host1, and host2). # ls host0 host1 host2 host3 host4 host5 host6 host7 host8 4. Run echo "- - -" > /sys/class/scsi_host/host*/scan to scan for disk devices. host* is an HBA card port. The LUN mapped to the HBA card port host2 is used as an example. # echo "- - -" > /sys/class/scsi_host/host2/scan 5. Run lsscsi to check LUN s newly mapped to the server. # lsscsi [0:0:0:0] cd/dvd hp DVD D DS8D3SH HHE7 /dev/sr0 [2:0:0:0] disk HUASY S5500T 2105 - [2:0:0:1] disk HUASY S5500T 2105 - [2:0:0:2] disk HUASY S5500T 2105 - [2:0:0:3] disk HUASY S5500T 2105 - [2:0:0:4] disk HUASY S5500T 2105 - [2:0:0:5] disk HUASY S5500T 2105 - [2:0:0:6] disk HUASY S5500T 2105 - [2:0:0:7] disk HUASY S5500T 2105 - [2:0:0:8] disk HUASY S5500T 2105 - [2:0:1:0] disk HUASY S5500T 2105 - [2:0:1:1] disk HUASY S5500T 2105 - [2:0:1:2] disk HUASY S5500T 2105 - [2:0:1:3] disk HUASY S5500T 2105 - [2:0:1:4] disk HUASY S5500T 2105 - [2:0:1:5] disk HUASY S5500T 2105 - [2:0:1:6] disk HUASY S5500T 2105 - [2:0:1:7] disk HUASY S5500T 2105 - [2:0:1:8] disk HUASY S5500T 2105 - [3:0:0:0] disk HUASY S5500T 2105 - [3:0:0:1] disk HUASY S5500T 2105 - [3:0:0:2] disk HUASY S5500T 2105 - [3:0:0:3] disk HUASY S5500T 2105 - [3:0:0:4] disk HUASY S5500T 2105 - [3:0:0:5] disk HUASY S5500T 2105 - [3:0:0:6] disk HUASY S5500T 2105 - [3:0:0:7] disk HUASY S5500T 2105 - [3:0:0:8] disk HUASY S5500T 2105 - [4:0:0:0] disk up updisk 2105 /dev/sda [4:0:0:1] disk up updisk 2105 /dev/sdb [4:0:0:2] disk up updisk 2105 /dev/sdc [4:0:0:3] disk up updisk 2105 /dev/sdd [4:0:0:4] disk up updisk 2105 /dev/sde [4:0:0:5] disk up updisk 2105 /dev/sdf [4:0:0:6] disk up updisk 2105 /dev/sdg [4:0:0:7] disk up updisk 2105 /dev/sdh [4:0:0:8] disk up updisk 2105 /dev/sdi

Method used to map a LUN to a cluster host
The storage device needs to map LUNs to host groups.

Method used to safely delete a LUN mapping from an AIX application server
Perform the following operations to delete a LUN mapping from an AIX application server: On the storage device side, delete the LUN mapping with the AIX application server. On the AIX application server side, run rmdev -dl diskName to delete the virtual disk of the mapped LUN. For example, you can run rmdev -dl disk3 to delete the virtual disk disk3. Note: If the virtual disk is not deleted and a new LUN is mapped to the AIX application server, a fault occurs, indicating that the virtual disk path is missing. Rectify the fault as follows: Unmount the file systems of the original LUN and the newly mapped LUN. Close the volume group of the newly mapped LUN. Delete the virtual disks of the original LUN and the newly mapped LUN. Run cfgmgr to re-scan for disks.

Method used to scan for mapped LUNs in the VMware ESX operating system
In the VMware ESX operating system, you scan for mapped LUNs as follows: Use the vSphere Client to log in to the VMware ESX host. In vSphere Client, click the Configuration tab. Select Storage in the Hardware area. In the View area of the right function pane, click Datastores. In the lower function pane, click Add Storage. The Add Storage dialog box is displayed. Scan for LUNs as prompted in the Add Storage dialog box.

Method used to map LUNs in OceanStor T Series unified storage
You can map LUNs in OceanStor T Series unified storage as follows: 1. The storage system provides two mapping modes: array port mapping type and initiator mapping type. Select a proper mapping mode based on the service requirements and networking. For more details, go to the Setting a Mapping Mode page. 2. If the connection is an iSCSI connection, the mapping can be added through the initiator. For more details, go to the Initiator Mapping Mode (for Fibre Channel Connections and iSCSI connections) page. 3. If the connection is a Fibre Channel connection, the mapping can be added through the initiator or array port. For more details, go to the Initiator Mapping Mode (for Fibre Channel Connections and iSCSI connections) page or the Array port Mapping Mode (for Fibre Channle Connections) page.

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