Changing the state of a host adapter

About the state of a host adapter

A host adapter can be enabled or disabled. You can change the state of an adapter by using the storage command.

When to change the state of an adapter

Disable

You might want to disable an adapter if

You are replacing any of the hardware components connected to the adapter, such as cables and Gigabit Interface Converters (GBICs)
You are replacing a malfunctioning I/O module or bad cables

You can disable an adapter only if all disks connected to it can be reached through another adapter. Consequently, SCSI adapters and adapters connected to single-attached devices cannot be disabled.

If you try to disable an adapter that is connected to disks with no redundant access paths, you will get the following error message:

"Some device(s) on host adapter n can only be

 accessed through this adapter; unable to disable adapter"

After an adapter connected to dual-connected disks has been disabled, the other adapter is not considered redundant; thus, the other adapter cannot be disabled.

Enable

You might want to enable a disabled adapter after you have performed maintenance.

Enabling or disabling an adapter

To enable or disable an adapter, complete the following steps.

Step	Action
1	Enter the following command to identify the name of the adapter whose state you want to change: storage show adapter Result The field that is labeled "Slot" lists the adapter name.
2	If you want to...	Then...
	Enable the adapter	Enter the following command: storage enable adapter name name is the adapter name.
	Disable the adapter	Enter the following command: storage disable adapter name name is the adapter name.