Sun Fire V240 RAM Replacement
On one of our Sun Fire V240's with two processors and eight 1GB DIMMs, POST indicated that dimm7 was disabled.
Messages during POST:
0>Test Memory....| 0>ERROR: TEST = Address Bitwalk on Slave 1 0>H/W under test = MB/P1/B1/D1 (Bank 2), Motherboard 0>Repair Instructions: Replace items in order listed by 'H/W under test' above. 0>MSG = Pin 175 failed on MB/P1/B1/D1 (Bank 2), Motherboard 0>END_ERROR ... 0>ERROR: 0> POST toplevel status has the following failures: 0> MB/P1/B1/D1 (Bank 2), Motherboard 0>END_ERROR ... Power On Selftest Failed. CPU: 0 cause: MB/P1/B1/D1 (Bank 2), Motherboard CPU: 1 cause: MB/P1/B1/D1 (Bank 2), Motherboard NOTICE: CPU 1 has 2048/4096 MB of memory disabled ERROR: The following devices are disabled: dimm7 ERROR: POST failed SC Alert: MB/P1/B1/D1 (Bank 2), Motherboard has been failed by POST SC Alert: MB/P1/B1/D1 (Bank 2), Motherboard
This system had eight 1GB DIMMs. After this POST failure, the system only reported 6GB of available memory.
prtdiag -v output:
System Configuration: Sun Microsystems sun4u Sun Fire V240 System clock frequency: 167 MHZ Memory size: 6GB ... MB/P1/B1/D0 unused MB/P1/B1/D1 failed
When dimm7 was disabled, it is likely that dimm6 was also disabled, as the system only reported 6GB of memory.
Sun sent us two 1GB replacement DIMMs. Although the banks aren't labeled, the banks start at 0 and go through 7 (on a two-processor system) as you look at the system from the front. We replaced the DIMMs in banks 6 and 7 and the system again reported 8GB memory.