N+M Cold Standby; N+M Cold Standby Overview - Hitachi COMPUTE BLADE 500 SERIES Management Module Setup Manual

N+M cold standby

This section describes N+M cold standby.

N+M cold standby overview

N+M cold standby feature is to start the standby server blade automatically
when an active server blade fails. Management server, such as
ServerConductor/Blade Server Manager Plus, hereinafter referred to as BSM
plus, or Hitachi Compute Systems Manager, hereinafter referred to as HCSM,
receives the failure notification, analyzes the failure, and switches the active
server blade to the standby one. You can assign a standby server blade to
multiple server blades, and can start the standby server blade to restart
operation if one of them fails. Although operation is temporarily stopped due
to hardware failure, N+M cold standby requires less hardware resources and
less time for restarting operation after the hardware failure occurs.
N+M cold standby feature supports LPAR manager. When an active server
blade that runs multiple logical partitions (hereinafter called LPARs) fails,
restart LPARs in the standby server blade. The standby server blade can be
shared between the active server blade of basic mode and the active server
blade of LP mode.
Note:
• It is necessary that hardware of active and standby servers is the same
configuration or version (that is same as the Basic Mode).
Hitachi Compute Blade 500 Series Management Module Setup Guide
Figure 2-8 N+M cold standbys
Functional detail
2-69