Installation and Migration Guide
| Restrictions |
|---|
- You cannot use both DCE authentication and HACWS.
- You cannot use IPv6 aliasing with DCE, HACMP, and HACWS.
- You cannot use HACWS when you specify none for AIX
commands.
|
This chapter discusses how to install and configure the High Availability
Control Workstation (HACWS).
The information in this chapter is optional--you do not have to
install HACWS in order to run your SP system. Install HACWS if you want
to do any of the following:
- Continue running your SP system after a control workstation
failure.
- Shut down the control workstation for deferred hardware and software
maintenance without having a system outage.
- Maintain the SP system function and reliability when the control
workstation fails.
- Fail over the control workstation to a backup.
You can add an HACWS configuration at any time in the life of your SP
system.
The HACWS installation procedure requires that you install and configure
High Availability Cluster Multi-Processing for AIX (HACMP) on the primary and
backup control workstations. (See Task E. Configure High Availability Cluster Multi-Processing.) You may use any level of HACMP that is supported
with the level of AIX that you are using. Refer to the appropriate
HACMP documentation to determine which levels of HACMP are supported with the
level of AIX that you are using. At the time this manual was published,
|PSSP 3.4 was supported only with AIX 4.3.3 |and AIX 5L 5.1. |AIX 4.3.3 was supported with HACMP 4.4, HACMP
|4.4.1, HACMP Enhanced Scalability (HACMP/ES) 4.4, and
|HACMP/ES 4.4.1. AIX 5L 5.1 was supported with
|HACMP 4.4, HACMP 4.4.1, and HACMP/ES
|4.4.1.
HACMP runs on two control workstations in a two-node rotating resource
configuration. There are external disks and a dual RS-232 frame
supervisor card with a connection from each control workstation to each SP
frame. The external disks are not accessed concurrently. The
control workstation configuration provides automated detection, notification,
and recovery of control workstation failures. For more information
about HACMP, see HACMP for AIX: Concepts and
Facilities.
Notes:
- Before you begin, you should carefully plan your HACWS
installation. This will help make your installation more efficient and
successful. For more information about planning for HACWS installation,
see the RS/6000 SP: Planning, Volume 2, Control Workstation and
Software Environment.
- There is no hardware control or serial terminal cabling available from the
backup control workstation to support SP-attached servers in an HACWS
installation. This means that there is limited function from the backup
control workstation when a failover occurs. Refer to the RS/6000
SP: Planning, Volume 2, Control Workstation and Software
Environment for more details.
Keep these points in mind as you install HACWS:
- You must install your SP system with a regular control workstation
first. (The original control workstation becomes the primary control
workstation in your HACWS configuration.)
- You must install HACMP on both control workstations.
- HACWS supports only a single backup control workstation.
- Standby adapters on the primary control workstation are not
required.
- The external file system can be mounted over either the /spdata
or the /spdata/sys1 directories.
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