NEC 1000 Series - Manual (Page 8)

8
Mainframe-class RAS Features
Highly Available Center Plane
System restoration after the replacement of a failed crossbar card
no longer requires a planned system downtime
The Express5800/1000 series server has separated and
modularized the crossbar controller which ordinarily would reside
on the system center plane. By moving the crossbar controller off
of the center plane, a reduction in center plane failures has been
realized.
In the unlikely event of a crossbar failure, only the partition that is
linked to the crossbar will be temporarily shutdown, allowing for
the other partitions to continue operations uninterrupted, including
during the replacement of the crossbar card.
(The 1080Rf has a crossbar-less configuration.)
Complete modularization and redundancy
Improvements in fault resilience, continuous operation and serviceability
Major components of the Express5800/1000 series servers have
been modularized, allowing for better serviceability and easy
replacement in the event of a component failure.
Furthermore, to minimize the existence of single point of failure,
many of these modules have redundancy, allowing for continuous
operations (fault resilience).
Down
Failure Crossbar
Controller
(LSI)
Crossbar
Card
Crossbar Controller Mudularization
Only the node that is linked directly to the failed crossbar
will be temporarily shutdown
The failed crossbar
card can be
replaced without halting
other business
operations.
Cell Cell Cell Cell
Cell
Cell
Cell
Cell
Cell
Cell
Cell
Cell
Failure
Down
Operation 1
Node 1
Operation 2
Node 2
Operation 3
Node 3
Operation 4
Node 4
PCI box PCI box PCI box PCI box PCI box PCI box
Cell card
CPU CPU
CPU CPU
Memory
Memory
Cell card
CPU CPU
CPU CPU
Memory
Memory
Cell card
CPU CPU
CPU CPU
Memory
Memory
Cell card
CPU CPU
CPU CPU
Memory
Memory
Cell card
CPU CPU
CPU CPU
Memory
Memory
Cell card
CPU CPU
CPU CPU
Memory
Memory
Cell card
CPU CPU
CPU CPU
Memory
Memory
Clock Card
Cooling fan (N+1 redundant)
Power supply (N+1 / 2N redundant)
Service Processor
Clock Card
Crossbar Card
Crossbar Card
Crossbar Card
Crossbar Card
Spare
Cell Card
Redundant Crossbar
Redundant Clock Module
(Redundancy or Segmentation)
Redundant service processor
N+1 redundant cooling fan
N+1 redundant power supply
Quick recovery is possible
with a spare CELL card
1080Rf is crossbar-less
Full redundancy is available on the
1320Xf/1160Xf. Segregation is available
on the 1320Xf
Available on the 1320Xf/1160Xf
2N is included in the 1320Xf, and is offered
as an option on the 1160Xf/1080Rf
* This picture illustrates a 1320Xf
Front Side Back Side
Power
Distribution
Unit
Fan box
Fan box
Crossbar
card
Cell card
PCI Module
HDD Module
PCI Box
Service
Processor
Fan box
Fan box
Clock
card
Cell card
Sample: Express5800/1320Xf