Siemens SX Series User's Guide download pdf (Page 293)

U41272-J-Z385-3-76 293

Dynamic Reconfiguration Functional scope, concepts and applications

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 table 17 on page 403).

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 table 17 on page 403).

Notes

1. In addition to the memory specified in the basic configuration, spare memory can

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).

2. If the main memory is reduced and the workload is not adjusted, saturation levels

and increased paging rates can occur.

● 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:

– 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 System Administrator Guide: IP-Services”[33]).

– At ZASLAN level (user LAN) a redundant, DR-secure BCAM configuration must be

created. Details of this are described in the section “ZASLAN” on page 271.

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Siemens SX Series User's Guide Page 293