IBM-AUSTRIA - PC-HW-Support    30 Aug 1999

9086001 - SHARING IRQs may CAUSE UNPREDICTABLE RESULTS

    Record number:       H165698
    Device:              D/T8680
    Model:               M
    Hit count:           UHC00000
    Success count:       USC0000
    Publication code:    PC50
    Tip key:
    Date created:        O98/12/29
    Date last altered:   A99/01/18
    Owning B.U.:         USA


Abstract: 9086001 - SHARING IRQs may CAUSE UNPREDICTABLE RESULTS

SYMPTOM:

When installing a Netfinity ESCON Adapter (M/T 9086-001), unpredictable results may occur if the adapter shares IRQs.

Possible problems could be as follows:

•  Systems Network Architecture (SNA) addresses would not come online to the host  unless Communication Server for NT (CS/NT) was up with those addresses configured in a link.
•  With CS/NT up, the addresses would come online to the host, but a session could not be established to CS/NT.
   The host Physical Unit's (PU's) stayed in preqc status, and the CS/NT link did not activate.
   Eventually, CS/NT operations panel showed a big X mark through the ESCON Data Link Control (DLC).
   These are only examples of possible problems. Others may occur.

PROBLEM ISOLATION AIDS:

•  The system is one of the following IBM Netfinity servers that supports the Netfinity ESCON Adapter:

    a Netfinity 5000 server, Type 8659, any Model.
    a Netfinity 5500 server, Type 8660, any Model.
    a Netfinity 5500-M10 server, Type 8661, any Model.
    a Netfinity 7000 server, Type 8651, any Model.
    a Netfinity 7000-M10 server, Type 8680, any Model.

•  The system is configured with a Netfinity ESCON Adapter M/T 9086-001.

FIX:

Insure that the Netfinity ESCON Adapter has its own dedicated IRQ.
If 2 adapters are installed make sure both have their own dedicated IRQ.

Verify Resources are not shared.

DETAILS:

The Netfinity ESCON Adapter will not share resources.

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