Operating instructions

7.8 Memory Problems
Table 7–9 Troubleshooting Memory Problems
Symptom Action
DIMMs ignored by system, or
Ensure that each memory array has identical
system unstable. System
DIMMs installed.
hangs or crashes.
DIMMs failing memory power-
Try another set of four DIMMs.
up self-test.
DIMMs may not have ECC Some third-party DIMMs may not be
bits. compatible with DS25 systems. Ensure
memory DIMMs are qualified.
Noticeable performance
This could be a result of hard single-bit ECC
degradation. The system may
errors on a particular DIMM. Check the error
appear hung or run very
logs for memory errors.
slowly.
Ensure memory DIMMs are qualified.
7-12 DS25 Owner’s Guide