IBM SG24-5131-00 Manuale Utente

Cluster Hardware and Software Preparation 

The command line version of this is:

As in the case of the SCSI-2 Differential Controller, a system reboot is 
required to bring the change into effect.

The maximum length of the bus, including any internal cabling in disk 
subsystems, is limited to 19 meters for buses connected to the SCSI-2 
Differential Controller, and 25 meters for those connected to the SCSI-2 
Differential Fast/Wide Adapter/A or Enhanced SCSI-2 Differential Fast/Wide 
Adapter/A.

This section describes how to define the LVM components shared by cluster 
nodes in an HACMP for AIX cluster environment.

Creating the volume groups, logical volumes, and file systems shared by the 
nodes in an HACMP cluster requires that you perform steps on all nodes in 
the cluster. In general, you define the components on one node (referred to in 
the text as the source node) and then import the volume group on the other 
nodes in the cluster (referred to as destination nodes). This ensures that the 
ODM definitions of the shared components are the same on all nodes in the 
cluster.

Non-concurrent access environments typically use journaled file systems to 
manage data, while concurrent access environments use raw logical 
volumes. This chapter provides different instructions for defining shared LVM 
components in non-concurrent access and concurrent access environments.

Change/Show Characteristics of a SCSI Adapter

SCSI adapter

ascsi1

Description

Wide SCSI I/O Control>

Status

Available

Location

00-06

Internal SCSI ID

7                       +#

External SCSI ID

[6]                     +#

WIDE bus enabled

yes                     +

...
Apply change to DATABASE only 

# chdev -l ascsi1 -a id=6 -P