User`s guide

System Troubleshooting and Diagnostics

5.2 Product Fault Management and Symptom-Directed Diagnosis

The error log utility translates the entry into the traditional three-column

format. The ﬁrst column shows the register mnemonics, the second column

depicts the data in hex, and the last column shows the actual English

translations.

As in the above example, the OpenVMS error handler also provides support

for the /INCLUDE qualiﬁer, such that CPU and MEMORY error entries can be

selectively translated.

Since most kernel errors are bounded to either the processor module/system

board or memory modules, the individual error ﬂags and ﬁelds are not covered

by the service theory. Although these ﬂags are generally not required to

diagnose a system to the FRU (Field Replaceable Unit), this information can

be useful for component isolation.

ERF bit to text translation highlights all error ﬂags that are set, and other

signiﬁcant state—these are displayed in capital letters in the third column.

Otherwise, nothing is shown in the translation column. The translation rules

also have qualiﬁers such that if the setting of an error ﬂag causes other

registers to be latched, the other registers will be translated as well. For

example, if a memory ECC error occurs, the syndrome and error address ﬁelds

will be latched as well. If such a ﬁeld is valid, the translation will be shown

(e.g. MEMORY ERROR ADDRESS); otherwise, no translation is provided.

5.2.5 Interpreting CPU Faults Using ANALYZE/ERROR

If the following three conditions are satisﬁed, the most likely FRU is the

CPU module. Example 5–1 shows an abbreviated error log with numbers to

highlight the key registers.

No memory subpacket is listed in the third column of the FLAGS register.

CESR register bit <09>, CP2 IO Error, is equal to zero in the KA52/53/54

DSER register bits <07>, Q22 Bus NXM, <05>, Q22 Bus Device Parity

Error, or <02>, Q-22 Bus No Grant, are equal to zero in the KA52/53/54

The FLAGS register is located in the packet header, which immediately follows

the system identiﬁcation header; the CESR and DSER registers are listed

under the KA52/53/54 Register Subpacket.

CPU errors will increment an OpenVMS global counter, which can be viewed

using the DCL command SHOW ERROR, as shown in Example 5–2.

System Troubleshooting and Diagnostics 5–15