IBM DS8700, Introduction And Planning Manual

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Present SIM data to all hosts
Service Information Messages (SIMs) are offloaded to the first I/O request. The
SIMs are directed to each logical subsystem in the storage facility if the request is
device or control unit related. The SIMs are offloaded to the individual logical
volume when the request is media related. This control switch determines whether
SIMs are sent to all, or to only the first, attached IBM System z LPAR making an
I/O request to the logical system or logical volume. This setting applies to IBM
System z and S/390 environments only.
Control unit threshold
This control unit threshold switch provides the threshold level, presenting a SIM to
the operator console for controller related errors. SIMs are always sent to the
attached IBM System z hosts for logging to the Error Recording Data Set (ERDS).
SIMs can be selectively reported to the IBM System z host operator console, as
determined by SIM type and SIM severity. This setting applies to IBM System z
and S/390 environments only.
Table 78. SIM presentation to operator console by severity
Selection Severity of SIM presented to operator console
Service Service, Moderate, Serious, and Acute (all)
Moderate Moderate, Serious and Acute
Serious Serious and Acute
Acute Acute
None None
Table 79. SIM severity definitions
Severity Definition
Service No system or application performance degradation is expected in
any environment.
Moderate Performance degradation is possible in a heavily loaded
environment.
Serious A primary subsystem resource is disabled.
Acute A major subsystem resource is disabled. Performance may be
severely degraded. System or application outages may have
occurred.
Device threshold
This control switch provides the threshold level, presenting a SIM to the operator
console for device related errors. Device threshold levels are the same type and
severity as control unit threshold settings. Device threshold applies to IBM System
z and S/390 environments only.
Media threshold
This control switch provides the threshold level, presenting a SIM to the operator
console for media related errors. Media threshold levels are the same type and
severity as control unit threshold settings. Media threshold applies to IBM System
z and S/390 environments only.
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Introduction and Planning Guide