Den tors 23 apr. 2020 kl 08:49 skrev Darren Soothill < darren.soothill@xxxxxxxx>: > If you want the lowest cost per TB then you will be going with larger > nodes in your cluster but it does mean you minimum cluster size is going to > be many PB’s in size. > Now the question is what is the tax that a particular chassis vendor is > charging you. I know from the configs we do on a regular basis that a 60 > drive chassis will give you the lowest cost per TB. BUT it has > implications. Your cluster size needs to be up in the order of 10PB > minimum. 60 x 18TB gives you around 1PB per node. Oh did you notice here > we are going for the bigger disk drives. Why because the more data you can > spread your fixed costs across the lower the overall cost per GB. > I don't know all models, but the computers I've looked at with 60 drive slots will have a small and "crappy" motherboard, with few options, not many buses/slots/network ports and low amounts of cores, DIMM sockets and so on, counting on you to make almost a passive storage node on it. I have a hard time thinking the 60*18TB OSD recovery requirements in cpu and ram would be covered in any way by the kinds of 60-slot boxes I've seen. Not that I focus on that area, but it seems like a common tradeoff, Heavy Duty(tm) motherboards or tons of drives. -- May the most significant bit of your life be positive. _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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