Adding a new storage system to a running configuration using the CLI

You can add a new storage system to your SAN at any time using the command-line interface (CLI).

You must create one or more arrays on the new storage system.

If your storage system provides array partitioning, create a single partition from the entire capacity available in the array. You must record the LUN number that you assign to each partition. You must also follow the mapping guidelines (if your storage system requires LUN mapping) to map the partitions or arrays to the Lenovo Storage V series ports. You can determine the Lenovo Storage V series ports by following the procedure for determining WWPNs.

To add a new storage system, follow these steps:

Issue this CLI command to ensure that the clustered system (system) has detected the new storage (MDisks):
```
detectmdisk
```
Determine the storage-system name to validate that this is the correct storage system. The storage system is automatically assigned a default name.
- If you are unsure which storage system is presenting the MDisks, issue this command to list the storage systems:
```
lscontroller
```
Find the new storage system in the list. The new storage system has the highest-numbered default name.
Record the name of the storage system and follow the instructions in the section about determining a storage-system system name.
Issue this command to change the storage-system name to something that you can easily use to identify it:
```
chcontroller -name newname oldname
```
where newname is the name that you want to change the storage system to and oldname is the name that you are changing.
Issue this command to list the unmanaged MDisks:
```
lsmdisk -filtervalue mode=unmanaged:controller_name=new_name
```
These MDisks should correspond with the arrays or partitions that you have created.
Record the field controller LUN number. This number corresponds with the LUN number that you assigned to each of the arrays or partitions.
Create a new storage pool and add only the arrays that belong to the new storage system to this storage pool. To avoid mixing RAID types, create a new storage pool for each set of array types (for example, RAID-5, RAID-1). Give each storage pool that you create a descriptive name. For example, if your storage system is named FAST650-fred, and the storage pool contains RAID-5 arrays, name the MDisk Group F600-fred-R5.
```
 mkmdiskgrp -ext 16 -name mdisk_grp_name
-mdisk colon separated list of RAID-x mdisks returned
in step 4
```
This creates a new storage pool with an extent size of 16MB.