Expanding a logical unit using the CLI

You can use the command-line interface (CLI) to expand a logical unit.

Some storage systems enable you to expand the size of a logical unit (LU) using vendor-specific disk-configuration software that is provided. The steps in this procedure are required for the Lenovo Storage V7000 to use extra capacity that is provided in this way.

To ensure that this additional capacity is available to the Lenovo Storage V7000, follow these steps:

  1. Issue the rmmdisk CLI command to remove the managed disk (MDisk) from the storage pool.
    Use the force parameter to migrate data on the specified MDisk to other MDisks in the storage pool. The command completes asynchronously if -force is specified. You can check the progress of active migrations by running the lsmigrate command.
  2. Use the vendor-specific, disk-configuration software to expand the size of the logical unit on the storage system.
  3. Issue the detectmdisk CLI command to rescan the Fibre Channel network. The rescan process discovers any changes to existing MDisks and any new MDisks that have been added to the clustered system. This command completes asynchronously and might take a few minutes.
    To determine whether a discovery operation is still in progress, use the lsdiscoverystatus command.
  4. Issue the lsmdisk CLI command to display the additional capacity that has been expanded.
  5. Issue the addmdisk CLI command to add the MDisk back to the group.

The extra capacity is available for use by the Lenovo Storage V7000 system.

Parent topic: Configuring and servicing storage systems