Lucent Technologies 555-233-119 Processor Cache Audit (#896), Processor Write Buffer Test (#900)

DEFINITY ECS Release 8.2 Maintenance for R8.2csi 555-233-119 Issue 1
April 2000
Maintenance Objects
3-973PROCR (RISC Processor Circuit Pack TN798)
3
Processor Cache Audit (#896)
This nondestructive audit c hecks the state of the Cache Parity bit mai ntained by
the RISC CPU. If this bit is set, there may be problems with either the CPU, the
Instruction, or Data Cache. An ind ication of bad c ache parity won’t itself mean
that the system won’t operate, but minor to seve re performance deg radation may
be present. For example, a single b ad bit in either c ache could c ause this bit to
be set. If the faulty word is seld om accessed, the impact will be small. If the bit is
accessed frequentl y, there could be serious problem s with much, or all, of the
cache (stuck da ta bit) with the only direct ind ication again being the cache parity
error or cache test error.
Processor Write Buffer Test (#900)
This test is a nondestructive test. This test verifies that the Write Buffer operates
properly on the Processor circ uit pack. Failure of this test is serious. The
Processor circuit pac k must be replaced as soon as possible.
Table 3-427. Test #896 Processor Cache Audit
Error
Code
Test
Result Description/ Recommendation
100 ABORT The test did not complete within the allowable time period.
1. Retry the command.
2500 ABORT Internal system error
1. Retry the command.
FAIL The Cache Parity Error bit is set, there may be problems with either the
CPU or the Instruction or Data Cache.
1. Retry the command.
2. If the test continues to fail, run test processor a|b long.
3. If the Processor Cache test (#895) or the Processor Cache Audit
(#896) fails, replace the Processor circuit pack.
PASS The Processor has not detected any parity errors in the Instruction and
Data Caches since the last time this audit was run.
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