Emmanuel Florac wrote:This sounds more like a VM issue than a RAID issue. I suspect the interesting difference between your small systems and your large systems is the amount of RAM, not the storage. On small systems, the penalty for sizing caches incorrectly is much greater, so small systems tend to suffer more if the default tunings are a little off. If you do some VM tuning (particularly in /proc/sys/vm) and find that it makes a large difference, please do report it. Most of the exciting VM work is targeted to the high end, not the low end, so it's quite possible that the heuristics which choose default VM parameters at boot time are no longer as good for small systems as they once were. -- Chris --
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