For example with a SBE reporting on DIMM A1, swapping this DIMM with a different DIMM will result in one of following: Interpreting the results after swapping DIMMsĪs a general rule, DIMM errors tend to follow the DIMMs identified in the errors. Swapping a whole channel of DIMMs (A1, A4, A7 - marked blue) with another channel (B1, B2, B3 - marked red) will test the whole channel of DIMMs in a new channel, and on a new memory controller.įigure 5: Swapping DIMMs A1, A4, A7 with DIMMs B1, B4, B7 Swapping the whole bank of DIMMS (A1, A2, A3 - marked blue) with another bank (B1, B2, B3 - marked red) will test the whole bank of DIMMs in a new bank, on a new memory controller.įigure 4: Swapping DIMMs A1, A2, A3 with DIMMs B1, B2, B3 Swapping DIMM A1 (marked in blue) with DIMM B1 (marked in red) which will put the DIMM on an altogether different memory controller (CPU).
Swapping DIMM A1 (marked in blue) with DIMM A9 (Marked in red) to try the DIMM in a different memory channel and bank
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Note: The Memory Video Archive contains videos showing how to remove and install memory in different servers. To make the explanations easy, we will assume the faulty DIMM is A1 or one of the set marked in Blue in the illustrations. Below you will find a representation of these methods.
You might need to use more than one of these methods to pinpoint the faulty DIMM or Socket. Isolating memory issues involves swapping memory DIMMs into different memory sockets, channels, banks and controllers. There are several ways you can swap the DIMMs around to narrow down the fault. See Figure 1 (English Only) for an example of memory errors appearing in the iDRAC interface on an R715.įigure 1: Memory errors as displayed in iDRAC 6 logs When a single-bit error (SBE) and/or multi-bit error (MBE) is reported on one or more memory DIMM locations, the cause might not be down to the DIMM itself, so some simple troubleshooting will need to be performed to determine where exactly the fault lies. Troubleshooting memory errors on PowerEdge systems by swap testing For newer systems please check this article What is DDR4 Self-healing on Dell PowerEdge Servers with Intel Xeon Scalable Processors.
Note: This article does not apply to newer systems with Xeon Scalable Processor.
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