On 07/23/2010 12:59 AM, JD wrote: > > Can you describe the hardware of the private cloud > and the hardware of the non-cloud machine in the > location where you were involved in the installation > or configuration? > I would like to know what is being compared to what > when claims of doubling the performance are made. > > For example if the cloud has a total of 400 cpus, > 100 TB of mirrored raid 5, 200 ports of 10GigE, and > 1600 GB ram,...etc...etc > You are missing several key points here: Cloud Storage products from Amazon and/or Google do not need to, and seldom does, contain a file locking mechanism, and therefore, a real file system. As such, cloud storage has no need of RAID X. Could storage is not always, necessarily, concurrent, but usually allowed to 'drift' across WAN links as necessary and prudent. Also, if every physical compute system runs a hypervisor on the hardware, you can't count CPUs as in: 2 Quad Core Xeons; you count them as computation units per system, where the system could include available hardware from hundreds of physical computers, without using all of the resources of those physical computers. Look at the Cloud Harmony benchmarks for your favorite cloud provider here: http://blog.cloudharmony.com/2010/06/cloud-server-benchmarking-part-4-memory.html Consider that you can get (on paper) more throughput from an Isilon platform than you can from the largest EMC or Hitachi RAID based device. The IT world is moving fast, away from fixed hardware specifications, towards modular nodes that offer storage, cpu, or whatever. Isilon is not the only example, but an easy one to find and assess for yourself. I do not represent them, or anyone else in this reply. Just trying to open a door here and there. Good Luck! -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
