@kernellogger @brendangregg Getting back to previous comment about I/O- and memory-related failures, note that Gregg's _System Performance_ has multiple chapters on these topics, and network too.For example, a fantastic talk at Southern California Linux Expo a few years ago by Frits Hoogland (https://www.socallinuxexpo.org/scale/19x/speakers/frits-hoogland) highlighted how low memory can limit writeback of dirty pages and make a system very slow indeed.