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How to Caliculate Virtual Machine Configuration based on the application we use????

Hello,

i have a doubt in creating a vm on vsphere based on the application we are going to run.

Details:

Hardware : HP Proliant DL385 G7 with 24GB of RAM and 2TB of HDD, 16CPU'sX 2GHZ processor

i installed vsphere-4.1 on this server

## i installed a vm, ubuntu-10.10 server with 4 cpu, 6GB ram and 100 GB of HDD.
## i installed matlab on this vm.
## i got reply from the users saying that when they are running simulation it's performing slow compared to their desktop's (which are I3 processor with 4GB DDR3 RAM)

==>i don't understand why this it was slow. i can't analyze weather i didn't provide sufficient resources to the vm or i don't have proper HOST (vsphere H/W).

can any body tell me how to calculate virtual machine configuration depending on the applications we will install (if we have sufficient hardware resources in the server)



Thanks



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hellosoft
Asked:
hellosoft
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2 Solutions
 
jhyieslaCommented:
You pretty much do it as if you were putting it on a physical box instead of a VM. The OS requires so much RAM and CPU power. The app will have it's own requirements.

Beyond that, you have to take into account the number of other VMs on the host and their requirements. Beyond that the main things that can slow down an app are the speed of the disk subsystem, if you are using RAID and which RAID you chose, and if you are running Windows, which it appears you are not, are you running at least server 2008; versions before then don't align the disk sectors properly by default which may slow down disk access - not sure if LInux has this problem or not.
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hellosoftAuthor Commented:
Thanks for reply,

Current the vsphere is holding only 3vm's(fedora, server 2008) with 2GB RAM, 100 GB HDD for each.
we are using RAID-5 in HOST.

Thanks,
Rafi
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jhyieslaCommented:
Something else to consider is total disk space. You obviously need what you need for the VMs.  If you do snapshots very often, you need the space to hold them while they are in service AND enough space to roll them back. So, if you take a snapshot and forget that you did (snaps aren't meant to stay around a long time), so that it grows to, say, 20 GB, you obviously need that 20GB of space, but you will also need an additional 20 GB to be able to roll the snap back into the real VMDK file.
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hellosoftAuthor Commented:
it near
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