IBM VERSION 5 SY44-5902-05 - Manual (Page 77)

Concurrent maintenance
From packaging displays
The Concurrent Maintenance option is available only on the packaging hardware
resources displays.
This option provides the capability to power off a subset of the server and perform
service actions on hardware in that subset. Other parts of the server remain
powered on and functional. Service actions supported include replacement,
upgrade, removal, addition, and movement of hardware.
The subset of server hardware that you power off in order to shut down a
particular piece of hardware is known as the power domain for that piece of
hardware. The power domain of a piece of hardware is determined by the
granularity of the power control system. For example, the power domain of an I/O
processor on an SPD bus is the frame in which the SPD bus resides. This is
because the power control system for SPD busses does not support powering
individual I/O processor slots on and off. In contrast, the power control system for
PCI busses does support powering individual I/O card slots on and off.
Consequently, the power domain for an I/O card on a PCI bus is the card itself.
There are some restrictions on hardware resource concurrent maintenance which
are enforced by the operating system.
Some of the more common restrictions are as follows:
v You cannot power off some I/O towers without powering off the entire server.
v If you are powering off a power domain containing configured disk units that
are not mirrored in a different power domain, it is likely that a disk unit
attention SRC will appear in the operator panel display. Also, some or all server
activity could stop until the domain is powered back on and the disk units
Change Logical Hardware Resource Detail
Description . . . . . . . . . . . . : Communications IOP
Type-Model . . . . . . . . . . . . : 2620-001
Status . . . . . . . . . . . . . . : Operational
Serial number . . . . . . . . . . . : 10-3157011
Current resource name . . . . . . . : CC08
Type changes, press Enter.
New resource name . . . . . . . . . CC08
F3=Exit F5=Refresh F6=Print
F9=Displaydetail F12=Cancel
Figure 19. Example Change Logical Hardware Resource Detail display
Chapter 2. Hardware Service Manager 63