SAP Knowledge Base Article - Preview

2944508 - All server memory being consumed by Linux buffers and cache

Symptom

You run OS command 'free -g' and observe 'buff/cache' gradually increasing to the point where it consumes 85% of total available system memory.

free -g
Memory information (in GB):
                    total        used       free       shared      buff/cache       available
Mem:           62            5           1           19            55                     36
Swap:          59            6           53

buff/cache is memory used by the Linux kernel buffers and page cache.

You force clear buff/cache using the 'echo' command but observe it gradually increase again to 85% memory consumption.  Shutting down the SAP NW application and/or database server
does not show buff/cache release any memory.

The SAP environment is running without issue and performing well.  Checking the Linux 'messages' log there is no sign of the oom-killer at work.


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Environment

  • Red Hat Enterprise Linux 8.2 (Ootpa)
  • NW ABAP Oracle

Product

SAP ERP 6.0

Keywords

RHEL RAM /proc/meminfo , KBA , BC-OP-LNX , Linux , Problem

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