Adding Links

Prerequisites

• The necessary hardware has been installed and cables have been connected on the storage system.
• UltraPath has been installed on the application server.

Procedure

1. Log in to the CLI of the storage system.
2. Check the host-to-storage HBA link status.
   1. Run the show port general command to check the Fibre Channel link status of the front-end ports on the storage system.

      If the Running Status value is Link up, the link connection is normal.

   2. Run the show initiator command to check whether the storage system is able to obtain the information about the host's initiator.

3. View the original system information.
   1. Run the show mapping_view general command to view information about existing mapping views. Record the ID of the mapping view to be expanded.
   2. Run the show mapping_view port_group and show mapping_view host_group commands respectively to view and record the IDs of the port groups and host groups in the mapping view.
   3. Run the show host_group host command to view and record the host ID based on the obtained host group ID.
   4. Run the show initiator and show port_group port commands respectively to view and record the initiator and port information.

      The initiator's WWN should be the same as planned.

4. Expand the reliability on the storage system.
   • If WWNs are to be added to an existing host group, run the add host initiator command to add initiators to the corresponding hosts.
   • If ports are to be added to an existing port group, run the add port_group port command to add ports to the port group.

5. Check whether the expansion succeeds.
   • For expansion based on WWNs, run the show initiator command to check whether the hosts contain the corresponding added initiators.
   • For expansion based on ports, run the show port_group port command to check whether the port group contains the added ports.

6. Identify the added objects on the application server.
   1. Back up the disk and volume group (VG) information.
      1. Run the lsdev -Cc disk and lsdev -Cc disk | wc -l commands to scan for disks in the host.
      2. Run the lspv and lsvg commands to back up the physical volume (PV) and VG information.
   2. Run the cfgmgr -vl fcsX command to scan for the HBAs connected to the storage system and identify system devices.

      Replace X with a fiber adapter ID.

   3. Run the lsdev -Cc disk and lsdev -Cc disk | wc -l commands to check whether the number of newly generated device files is the same as expected and whether the vendor is Huawei.

7. Configure UltraPath virtual disks.
   1. Run the upadm show path command to check the disk path status.

      If a link is in the Degrade status, run the upadm set phypathnormal command to handle the issue.

8. Run the upadm show iostat command to view the VLUN status of the I/Os to be monitored.

   If I/Os are evenly distributed to all paths and no errors are reported in a duration of 30 seconds, press Ctrl+C to exit the monitoring.

9. Run the errpt and errpt -a commands to check for any errors during disk allocation by the host.

   Handle the errors before proceeding to use the storage space.