IBM eServer iSeries Manual page 13

the bus than C02. When the card location is a higher number such as C07, then C06 is farther from
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| the beginning of the bus than C07. This may not be true for all models and expansion units. When
in doubt contact your service representative.
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| The following information pertains to a multi-partitioned environment:
| v If you plan to use Operations Console as the primary console or a backup, you must tag the IOP to
support the primary console and Electronic Customer Support, even if you do not plan to use
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| Electronic Customer Support. For example, if you are planning for Operations Console direct, you
must tag an IOP with the console tag and the Operations Console device tag. The same is true if you
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are planning to use Operations console LAN.
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v When more than one network adapter is available for a single IOP, the adapter with the lowest bus
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| address will be chosen for use by Operations Console.
v The term alternate console is referring to a twinaxial console type located in another IOP tagged as the
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alternate console. Operations Console and HMC type consoles do not use resources tagged as the
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| alternate console. Refer to Plan for your backup console to consider the use of Operations Console as a
console in the event that a twinaxial console is not available.
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| Note: Tagging the same IOP as both the primary console and the alternate console may result in the
inability to select a console. If you have a twinaxial adapter in the same IOP as your primary
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console's adapter, consider the twinaxial adapter to be a backup console, not an alternate
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| console. You only have to change the console mode to take advantage of the twinaxial adapter
for the console.
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Plan for your backup console
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This topic covers backup console information you might want to consider to quickly recover from the
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unexpected loss of your console. Many system plans include a level of redundancy to allow for hardware
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| failures, but some do not consider the console in those plans. Here are some suggestions if you would
like to plan for a backup for your console:
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| Considerations for a backup console:
| v The adapter location is fixed or at least limited for independent servers or primary partitions. Based on
your server's hardware requirements you may have limited choices of console types. Try to
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| accommodate at least one additional console type, if possible.
| v Consider using the new take over and recovery option as part of your backup console strategy.
However, the hardware used for the new console mode must exist and be available at the time of
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recovery. See Take over or recover an Operations Console connection.
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| v For partitions consider:
| – In an LPAR environment, the term alternate console is referring to the twinaxial console type
located in another IOP tagged as the alternate console. If a failure of the primary console is detected,
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the system will automatically try the alternate console's IOP. This gives you another level of
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| protection. Tagging a single IOP as both the primary console and the alternate console can result in
the inability to select a console. Further isolation can be planned by placing the alternate console
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| IOP on a different bus so that failures of the primary console's bus will not prevent a console from
| being available.
– Models 270 and 8xx are tagged for a console type only at the IOP level. Placing two network
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adapters for the same IOP can sometimes make it difficult to determine, in advance, which network
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| adapter will be used for the console. IBM recommends only one network adapter for the IOP tagged
as the primary console to support Operations Console local console on a network. The lowest
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addressed network adapter on the bus will be chosen for the console.
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| – Consider a shared resource environment in which you can allocate and deallocate a console
supporting IOP to a partition on a part-time basis. Many work environments rarely need a console
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device on a full-time basis and you can reduce your initial cost of dedicated hardware by
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| implementing this concept.
7
Operations Console