Am 18.01.2014 23:09, schrieb Jorge Bastos: > I know what you're saying, but hey, 120GB SSD SATA3 for a SWAP scenario > cost's for me 70,00€, and 16GB of physical RAM about 130,00€. > I believe I'll have better performance with a dedicated SSD for swap of 120GB > than more extra 16GB (I hope!
no, and for a difference of 60 € i even would not consider to buy the cheaper in case of server hardware you do not get one of them for that price nor would you consider SATA drives at all well, try it out, but as said: i see no single reason for swap the last 6 years and in case of virtualization you have *additional* overhead if the guest itself starts to swap and should in genereal read manpages and let the hypervisor do the overcomitting >> no because i refuse to find a valid reason for swap on a server >> >> yes, swap is faster on SSD, but that makes the overall situation not >> better than proper configuration not needing swap >> >> if your server not is using swap most of the time it does not matter >> how fast swap is at all, if it heavily starts using swap it goes down >> in any case because page-faults, cache-faults and all the overhead of >> swap out memory pages which are often accessed again causing other >> pages to be swapped and sort after dead loaded agin in circles >> >> if you invest the same money for the SSD disk in RAM and raise the >> innodb_buffer you gain *a lot* of more performance
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