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 a host adapter by using the storage command.

When to change the state of a host adapter

Disable

You might want to disable a host adapter if

You are replacing any of the hardware components connected to the host adapter, such as cables and GBICs
You are replacing a malfunctioning LRC module or bad cables

You can disable a host 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 host adapter after you have performed maintenance.

Enabling or disabling a host adapter

To enable or disable a host adapter, complete the following steps.

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