hi,
want to know what can be the biggest size of the virtual machine. for example if i have two nodes each having dual core 2ghz and 2gb ram (so total hardware will become 4cores and 4gb ram). my question is that can i make a virtual machine having 3 cores and 3gb (i.e. higher than physical config. of one node m/c)
thanks.
Hello,
this is a common question: for example http://open.eucalyptus.com/forum/can-i-create-vm-instance-huge-resources.
cheers
graziano
hi,
thanks for the reply.
as per my understanding that cloud is used as it has feature of clustering but if we can not make a vm bigger than physical config of node than how can we use the clustering features of cloud.
may be i am not understanding things properly, pls. advise.
with best wishes
balwant
Hello,
what you can do is create virtual clusters, which is unrelated to transforming a cluster into a big SMP machine. For the latter there were various projects trying to do that. but I'm not sure about the current status. Do you have a specific need or application that you are thinking of? If you can give us a specific use case we may be able to give better suggestions.
cheers
graziano
hi,
really thanks for your help
i have 10 systems each having config of dual core 2ghz with 2gb ram. now by using cloud, i want to make cluster of these systems and want to run my application. Some application will require 1core but some application may require 4 cores and 4gb ram whereas i have limited physical resource of dual core (2 core) and 2gb ram on each system. how can i do this by using cloud.
Hello,
may I ask which application do you have? Have these application been ported to a cluster before?
As I mentioned before, we are not aware of any hypervisor which supports aggregating resources on different machines, and even then performance will most likely suffer. The alternative is to move the application to a cluster settings, that's why I'm asking about the application itself.
cheers
graziano
we are using our intranet which runs on LAMP. we are not using this on cluster, this is single quad core machine on which it runs.
as i understand that vm can not be bigger than physical config of the node(machine).
now my question on this is that if hypervisor is limitation than if we use any virtualizaton tool on our servers and can use their auto / live migration tool. i seek your expert advise what is the extra special features we will get by using cloud.
Hi Graziano,
my question is that why we should use cloud. i can use any virtulization tool like Xen with their live migration facility. In Xen also i can make several vms on a physical machine and biggest vm machine config can be as as large as config of the machine. in cloud i am doing the same. i could not understand what feature cloud has over virutlization tool.
thanks
Hello,
well, we are not saying that the cloud is good fer everything and for everybody. In some sense you have to make the case for the cloud if it's of user for you. Cloud gives the user self-provisioning (any user can create instances instead of only the privileged ones), formalized the distinction between hardware and instance (if you have to use xen or kvm, hvm or not, makes a difference and you need to know when writing configuration to start instances), easier to use network setup (creating security groups and private networks can be time-consuming), as well as giving you access to storage to all instances (something that you can do by hand, but, once again, it takes time and effort to setup).
Personally, considering that Eucalyptus is available for free, I don't see why one wouldn't want to use it, instead of running instances by hand, but I may be partial here :)
I'll leave to other forum user to answer perhaps with more reasons on why to use or not the cloud.
cheers
graziano