NonStop S-Series System Expansion and Reduction Guide

HP NonStop S-Series System Expansion and Reduction Guide—522465-009
4-1
4 Reducing a System Online
This section describes the procedure for removing enclosures from a system online,
either to reduce a system or to expand a target system.
You should also read and understand the discussions and concepts in Section 3,
Planning System Reduction, before reducing a system online.
For information about offline reduction, see Section 5, Reducing a System Offline.
Note. You must perform each step as documented, in the order shown.
Step Page
1. Prepare the Donor System for Reduction
4-2
2. Record Information About the Donor System 4-4
3. Prepare Both ServerNet Fabrics 4-6
4. Inventory Enclosures to Be Removed 4-7
5. Prepare and Stop Devices and Processes 4-8
6. Ensure Devices and Processes Are Stopped 4-9
7. Delete Devices and Processes If Necessary 4-9
8. Prepare Enclosures for Removal 4-11
9. Finish the Reduction 4-19
10. Remove Other Cables From Powered-Off Enclosures 4-20
11. Physically Remove Enclosures From the System 4-20
Cautions.
•
You can reduce your system online only if it is running G06.04 or later, with a compatible TSM
package or G06.08 or later, with a compatible OSM or TSM package. If you are running an earlier
RVU than G06.04, you must reduce the system offline. See Section 5, Reducing a System Offline
.
•
Never remove group 01. Doing so will halt your system.
•
If any enclosures that you plan to remove are responsible for critical processes and resources, first
reconfigure your system to redirect these processes and resources to enclosures that will remain in
the system or terminate the processes and resources.
•
Make sure you have KMSF swap files available for the resources remaining on the donor system
after the reduction is finished. Otherwise, after you resize your system, applications and processes
on the resized system might terminate. For more information, see the Kernel-Managed Swap
Facility (KMSF) Manual.
•
Before you physically remove an enclosure, record all information such as IP addresses and
firmware versions, as described in this section. After an enclosure is disconnected from the system,
this information is inaccessible.
•
Even if you are sure you already know this information, complete the appropriate worksheets in
Appendix C
. If you do not record this information correctly now, you might not be able to configure
these enclosures when they are added elsewhere later.
•
Before removing enclosures, complete Worksheets 1 and 2.n for each enclosure.