On 2020-08-07 09:27, Manuel Lausch wrote:
I cannot confirm that more memory target will solve
completly. In my case the OSDs have 14GB memory target and I did have
huge user IO impact while snaptrim (many slow ops the whole time). Since
I set bluefs_bufferd_io=true it seems to work without issue.
In my cluster I don't use rgw. But I don't see why
different types of access the cluster do affect the form the kernel
manages its memory. My experience why the kernel begins to swap are
mostly numa related and/or memory fragmentation.
Can you share the amount of buffer cache available on your storage nodes?
We run the OSDs with osd_memory_target=11G and 22 GB of buffer cache
available. And with the buffer on (Mimic 13.2.8).
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