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66 DS8000 Series: Concepts and Architecture
Fault masking
If corrections and retries succeed and do not exceed threshold limits, the system remains
operational with full resources and no client or IBM Service Representative intervention is
required.
Resource deallocation
If recoverable errors exceed threshold limits, resources can be deallocated with the system
remaining operational, allowing deferred maintenance at a convenient time.
Dynamic deallocation of potentially failing components is non-disruptive, allowing the system
to continue to run. Persistent deallocation occurs when a failed component is detected; it is
then deactivated at a subsequent reboot.
Dynamic deallocation functions include:
Processor
L3 cache lines
Partial L2 cache deallocation
PCI-X bus and slots
Persistent deallocation functions include:
Processor
Memory
Deconfigure or bypass failing I/O adapters
L3 cache
Following a hardware error that has been flagged by the service processor, the subsequent
reboot of the server invokes extended diagnostics. If a processor or L3 cache has been
marked for deconfiguration by persistent processor deallocation, the boot process will attempt
to proceed to completion with the faulty device automatically deconfigured. Failing I/O
adapters will be deconfigured or bypassed during the boot process.
Concurrent Maintenance
Concurrent Maintenance provides replacement of the following parts while the processor
complex remains running:
Disk drives
Cooling fans
Power Subsystems
PCI-X adapter cards
4.3 Hypervisor: Storage image independence
A logical partition (LPAR) is a set of resources on a processor complex that supply enough
hardware to support the ability to boot and run an operating system (which we call a server).
The LPARs created on a DS8000 processor complex are used to form storage images. These
LPARs share not only the common hardware on the processor complex, including CPUs,
memory, internal SCSI disks and other media bays (such as DVD-RAM), but also hardware
common between the two processor complexes. This hardware includes such things as the
I/O enclosures and the adapters installed within them.