Requirements For Dr - Fujitsu Siemens Computers SX series User Manual

Dynamic Reconfiguration

10.1.4 Requirements for DR

With the requirements for DR a distinction is made below between the hardware and
configuration requirements and the situation-dependent requirements.
Hardware and configuration requirements
Distribution of the XSBs of each partition to 2 physical system boards.
The options are model-dependent (for details please also see
Models with all their XSBs on one system board only have limited DR capability
because maintenance during ongoing operation is not possible in this case.
CoD and dynamic workload distribution, on the other hand, are possible.
A bootable XSB exists on each system board.
Equipping of the XSBs with sufficient memory and CPUs to ensure the operational
integrity of the system with the XSBs of just one system board after a hardware failure.
The options are model-dependent (for details please also see
Notes
1. In addition to the memory specified in the basic configuration, spare memory can
2. If the main memory is reduced and the workload is not adjusted, saturation levels
Redundancy of the hardware resources and their configuration on both system boards
(e.g. console ports and mirrored boot disk):
For example, in the case of DR-disconnect the last console path remaining in the partition
and the last active disk mirror of the X2000 boot disk remaining in the partition may not
be located on the XSB. In the latter case no mirror disk may be in the RESYNC state,
either.
Redundancy of the LAN configuration (both for the admin LAN and the user LAN) by
implementing multipath capability using different system boards:
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–
U41272-J-Z385-3-76
also be kept available which is used during online maintenance to compensate for
the temporary loss of resources. Spare memory can be provided in the form of an
8-GB memory extension which is only used in part in normal operation or as
memory on an XSB which is not used in normal operation (spare XSB).
and increased paging rates can occur.
In the admin LAN IPMP (IP multipathing) must be used for this at Solaris level.
Corresponding hardware connections must be provided and in the IPMP configu-
ration it must be ensured that all LAN connections remain available even after all
the XSBs of a system board have been disconnected. When DR-disconnect is used
the XSB may not contain the last network port of an IPMP group remaining in the
partition (see also the
At ZASLAN level (user LAN) a redundant, DR-secure BCAM configuration must be
created. Details of this are described in the
Functional scope, concepts and applications
System Administrator Guide:
table 17 on page
table 17 on page
IP-Services" [33]).
section "ZASLAN" on page
403).
403).
271.
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