vm.swappiness = 1 vm.vfs_cache_pressure = 800 vm.dirty_ratio = 5 vm.dirty_background_ratio = 2 vm.min_free_kbytes = 65536 # Reserve 64MB for emergencies This is mainly useful for smaller systems/VMs/dev test/Raspberry Pi etc.. but even servers with huge amounts of RAM can start putting a ton of things into buffers and cache especially if you open large files constantly.........

Tired of checking iotop and seeing that your drbd partition is using 99.99% of io all the time and finding your drbd device performs slow in general? This is especially an issue in versions of DRBD in the 8.3 tree in particular one documented case is on "8.3.13" but it likely applies to other devices. The symptoms are that resyncing is fine and normal but any reasonable amount of activity is very slow and lagged and creates a high server load and con........