Defragging RAM / OOM failure

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http://unix.stackexchange.com – This question is fairly lengthy, so I'll ask the questions at the top and then go through my method of coming to the questions: Did (Busybox based) rm not execute because there wasn't enough contiguous RAM? If so, is there a lightweight method of defragging the DMA - without resorting to a system restart? If not, what caused it? How can I prevent it from happening in the future? After our test system had been running fairly intensively over the last few days - I telnet'd into the system and checked the test results. When I came to delete some data, the system returned the command line (as (HowTos)