Enabling ACP

ACP can increase your storage availability when you use SAS-connected storage shelves. If your storage system model has a dedicated port for ACP, then ACP is enabled by default and you do not need to explicitly enable ACP.

Before you begin

The ACP subnet must be cabled on an isolated network, with no switches or hubs.
For more information, see the Installation and Service Guide for your storage shelf.
If you are configuring ACP for storage shelves attached to an HA pair, you must have recorded the domain name and network mask to ensure that they are the same for both nodes.

About this task

The ACP subnet is a private Ethernet network that enables the ACP processor in the SAS module to communicate both with Data ONTAP and the SAS IOMs in the storage shelves.

The ACP subnet is separate from the I/O data path that connects the storage shelves to the HBA on the storage controller. When you configure ACP on one of the system's network interfaces, you must supply a private domain name that conforms to the standard for private internet addresses (RFC1918). You can use the system default domain or another network name (that is, an IP address ending in 0) that conforms to the standard.

If your system has a dedicated port for ACP (e0P), you must use it. If you previously configured ACP to use a different port, when you run the acpadmin configure command, ACP is updated to use the dedicated port.

Steps

If your system does not have a dedicated port for ACP (e0P), ensure that the port you are assigning to ACP is not in use by any other subsystem by reviewing your /etc/rc file and entering the following command: ifconfig interface_name
The interface you use for ACP should not be part of an Interface Group, and it should have no VLANs or IP addresses configured on it.
At the Data ONTAP command line, enter the following command: acpadmin configure
If you have not previously configured the networking information for ACP, you are prompted for that information. When you select a domain name and network mask for the ACP interface, Data ONTAP automatically assigns IP addresses for the ACP interface on the storage controller and both I/O modules on each storage shelf on the ACP subnet.
If you configured ACP to use a different port, reboot the node.
The previous port becomes available for use by another subsystem.
Verify your ACP connectivity by entering the following command: storage show acp
The ACP Connectivity Status should show "Full Connectivity".

Example

For example, with a dedicated ACP port, 192.168.0.0 as the ACP domain, and 255.255.252.0 as the network mask for the ACP subnet, the storage show acp command output looks similar to the following:

my-sys-1> storage show acp

 Alternate Control Path:            Enabled
 Ethernet Interface:                e0p
 ACP Status:                        Active
 ACP IP address:                    192.168.2.61
 ACP domain:                        192.168.0.0
 ACP netmask:                       255.255.252.0
 ACP Connectivity Status:           Full Connectivity
 ACP Partner Connectivity Status:   NA

Shelf Module      Reset Cnt    IP address      FW Version    Module Type   Status
---------------------------------------------------------------------------------
7a.001.A          002          192.168.0.145    01.05         IOM6          active
7a.001.B          003          192.168.0.146    01.05         IOM6          active
7c.002.A          000          192.168.0.206    01.05         IOM6          active
7c.002.B          001          192.168.0.204    01.05         IOM6          active