Determining physical resources

This scenario describes how to determine the physical resources within the storage complex.

Before you begin, you must have the command-line interface prompt and be connected to a configured storage complex.

A machine type 1750 storage unit supports one storage image.

A machine type 2107 storage unit can be configured to contain one or two storage images. The storage image partitioning is specified as part of the order for the system and is applied in the factory.

A machine type 2107 storage unit contains two processor complex (PC) enclosures. Each PC contains from one to three central electronic complex (CEC) enclosures. Each PC-CEC contains two internal interfaces that connect PC-CEC pairs and attach up to four I/O enclosures per interface to each PC-CEC. If a storage unit is partitioned into two storage images, then each storage image owns the I/O enclosure resources of one PC-CEC pair interface. Otherwise, the single storage unit owns the I/O enclosure resources installed on both PC-CEC pair interfaces.

Use the following CLI command sequence to determine if a machine type 2107 storage unit is partitioned into one or two storage images and to identify resources owned by a storage unit or image. In the case of a machine type 2107 partitioned into two storage images, the parameter storage_image_ID represents a single storage image.

Create a list of all storage units in the storage complex with the following command.
dscli> lssu
- Each storage unit is identified by a unique MTS identifier (manufacturer, machine type, serial number).
- For storage units, the last character of the MTS will be zero.
Create a list of the storage images in the storage complex with the following command.
dscli> lssi
- The storage image ID is associated with the storage unit ID.
- A machine type 1750 storage unit contains one storage image. The storage unit MTS and the storage image ID are identical.
- A machine type 2107 storage unit contains one or two storage images. The storage unit MTS and first storage image ID are identical (both end with the number "0"). A second storage image ID differs from the first only in the last character, which is "1".
Create a list of I/O ports with the following command.
dscli> lsioport -dev storage_image_ID
- Each I/O port is associated with its parent HBA ID.
- Each I/O port is associated with its parent I/O enclosure ID and with a PC enclosure (pair) interface set.
- Use this information when selecting a complement of I/O ports to be used for host system access to volumes. When possible, select a combination of I/O ports that are associated with different PC interfaces, I/O enclosures and HBA FRUs in order to maximize access bandwidth.
Create a list of storage enclosures with the following command.
dscli> lsstgencl storage_image_ID ... storage_image_ID
- Each storage enclosure is associated with its parent storage unit ID and storage image ID.
- Each storage enclosure is associated with a DA pair ID.
Create a list of array sites with the following command. Use this information when configuring arrays, ranks, extent pools, and volumes that will be accessed by a host system. When possible, select a combination of array sites that are associated with different DA pair IDs in order to maximize access bandwidth.
dscli> lsarraysite -dev storage_image_ID
- Each array site is associated with a storage image ID and DA pair ID.
- Each array site is associated with its parent storage enclosure ID and DA pair ID.