Vmware  disk expand and create new disk question

Posted on 2012-12-20
Last Modified: 2012-12-22
I have a linux box running of vmware and I have added 100GB as third drive, added to volume group and extended the volume,  but is there any  performance difference by  expanding the disk  instead of creating new disk?
Question by:mokkan
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
  • 2
  • +1
LVL 40

Assisted Solution

coolsport00 earned 200 total points
ID: 38710795
No..none. Assuming this is a 'data volume' & not a system volume, and assuming your "linux" OS version supports it, it is recommended to use a pvscsi scsi controller driver for data disks (not system disks) for better performance. But, using that controller type is also only recommended if you have IOPS > 2000 over that disk.


Assisted Solution

traoher earned 200 total points
ID: 38710801
If you are using a SAN as your storage, the answer is no.  It is still straight IOPs back to the SAN.  However, you might want to consider a different block size for performance vs waste of padded space.
LVL 121

Assisted Solution

by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 100 total points
ID: 38710822
No, but it's not recommended, because you will create two snapshots per parent disk, which can cause you issues in the future.
Tutorials alone can't teach real engineering

So we built better training tools.

-Hands-on Labs
-Instructor Mentoring
-Scenario-Based Tests
-Dedicated Cloud Servers

All at your fingertips. What are you waiting for?


Author Comment

ID: 38710827
Thank you very much. Yes, disk from SAN. Is there any performance in OS? Does system need more cpu cycle, if we add as a second disk instead on increasing?
LVL 40

Assisted Solution

coolsport00 earned 200 total points
ID: 38710833
There is no perf degradation; no added vCPUs are needed.

Accepted Solution

traoher earned 200 total points
ID: 38710861
Nope, as long as you can extend, you are good.  FYI, you cannot have any snapshot if you choose to extend the vmdk.

Author Comment

ID: 38716310
I've requested that this question be closed as follows:

Accepted answer: 125 points for traoher's comment #a38710861
Assisted answer: 125 points for coolsport00's comment #a38710795
Assisted answer: 125 points for traoher's comment #a38710801
Assisted answer: 0 points for mokkan's comment #a38710827
Assisted answer: 125 points for coolsport00's comment #a38710833

for the following reason:

thank you all of you guys.

Author Closing Comment

ID: 38716311
Thank you all of you guys. Great information.

Featured Post

Free NetCrunch network monitor licenses!

Only on Experts-Exchange: Sign-up for a free-trial and we'll send you your permanent license!

Here is what you get: 30 Nodes | Unlimited Sensors | No Time Restrictions | Absolutely FREE!

Act now. This offer ends July 14, 2017.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

HOW TO: Upload an ISO image to a VMware datastore for use with VMware vSphere Hypervisor 6.5 (ESXi 6.5) using the vSphere Host Client, and checking its MD5 checksum signature is correct.  It's a good idea to compare checksums, because many installat…
In this article, I will show you HOW TO: Suppress Configuration Issues and Warnings Alert displayed in Summary status for ESXi 6.5 after enabling SSH or ESXi Shell.
Teach the user how to use configure the vCenter Server storage filters Open vSphere Web Client:  Navigate to vCenter Server Advanced Settings: Add the four vCenter Server storage filters: Review the advanced settings: Modify the values of the four v…
This tutorial will walk an individual through the steps necessary to enable the VMware\Hyper-V licensed feature of Backup Exec 2012. In addition, how to add a VMware server and configure a backup job. The first step is to acquire the necessary licen…

696 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question