Performance of vCenter for VMs hosted on a different storage

Hi there Experts,

Assuming that I have the following:

Server Room 1:
- ESXi Server 1
- iSCSI Storage
- the in between connection is 10Gb
- the network connection is 1Gb
- vCenter and VMs are running inside that Storage

Server Room 2:
- ESXi Server 2 connected to the 1Gb Network
- This Server runs one VM located in his internal HDD

Assuming that I am adding the ESXi Server 2 and VM of Sever Room 2 to the vCenter of Server Room 1:

Using vCenter what would be the performance of VM (hosted on ESXi Server 2) compared to the VMs that are located in the same storage with vCenter?
mamelasAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
It's got nothing to do with vCenter Server, vCenter Server is just a management server, which allows you to manage ALL your Hosts and VMs, using a single point of presence, e.g. connected to vCenter Server.

The ESXi Host Server is responsible for the hosting on, in your case

iSCSI Storage (share storage) and Local Storage.

and sometimes you can find that the performance, may be better and faster on local storage BUT, without having more details about the make of your datastores which are presented to the ESXi servers, e.g. number of disks, RAID type, Disk type SATA or SAS, are you using Cache, SSDs etc

difficult to answer....

BUT....why not test yourself using the following in a VM, and compare the results...

CrystalDiskMark

from here

http://crystalmark.info/software/index-e.html

run it in the VM, select a disk, screenshot it, and upload....

and we will see which is the fastest, rather than guess!
mamelasAuthor Commented:
Dear Andrew,

Unfortunatelly I don't have yet the Software and part of the Hardware to perform this welocome test.
As per my previous answered question I am currently at the "design" stage.

Given that, the Server from Server Room 2 exists and is working smoothly with
the 1Gb network connection.

So I was wondering...:

If I format this and convert it to ESXi Server and then create a VM
that is same with the current Physical Server

will it run as smoothly as before?
will I have any serious impact since the vCenter is not installed locally and
the VM/ESXi is being accessed from Vcenter via a 1Gb network speed?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
will it run as smoothly as before?

Possibly, do you have any current server performance metrics, e.g. how much CPU, RAM and Disk I/O the current server uses, and is it an ideal candidate for virtualisation?

will I have any serious impact since the vCenter is not installed locally and

vCenter is a management server, and will have no impact.

the VM/ESXi is being accessed from Vcenter via a 1Gb network speed?

completely normal. All our installations, vCenter is a virtual server, and access the hosts via 1Gb network speed.

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mamelasAuthor Commented:
Problem Solved, Thank you!
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