Note to the AWS poster, you have some limited understanding of how disks are presented to AWS compute nodes. As a result your post is not relevant, and misleading.
When considering throughput, recall that disk IO is ideally parallel. While C* handles IO across multiple devices nicely, the unit of storage is a very large "block". Whether that serial read is adequate, or whether you do RAID 0 (max parallel, no checksum overhead, loss of one drive makes the whole volume unavailable) is a performance vs. reliability tradeoff. We like to say that we don’t get to choose our parents, that they were given by chance – yet, we can truly choose whose children we wish to be. - Seneca the Younger *Daemeon C.M. ReiydelleSan Francisco 1.415.501.0198London 44 020 8144 9872* On Fri, Sep 29, 2017 at 6:11 AM, Lutaya Shafiq Holmes < lutayasha...@gmail.com> wrote: > Please try and USE AWS > > amazon web services on aws.amazon.com > > On 9/29/17, Peng Xiao <2535...@qq.com> wrote: > > Hi there, > > we are struggling on hardware selection,we all know that ssd is good,and > > Datastax suggests us to use ssd,as Cassandra is a CPU bound db,we are > > considering to use sata disk,we noticed that the normal IO throughput is > > 7MB/s. > > > > > > Could anyone give some advice? > > > > > > Thanks, > > Peng Xiao > > > -- > Lutaaya Shafiq > Web: www.ronzag.com | i...@ronzag.com > Mobile: +256702772721 | +256783564130 > Twitter: @lutayashafiq > Skype: lutaya5 > Blog: lutayashafiq.com > http://www.fourcornersalliancegroup.com/?a=shafiqholmes > > "The most beautiful people we have known are those who have known defeat, > known suffering, known struggle, known loss and have found their way out of > the depths. These persons have an appreciation, a sensitivity and an > understanding of life that fills them with compassion, gentleness and a > deep loving concern. Beautiful people do not just happen." - *Elisabeth > Kubler-Ross* > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org > For additional commands, e-mail: user-h...@cassandra.apache.org > >
