Solved

Eager/Lazy Zeroed

Posted on 2013-12-28
8
1,257 Views
Last Modified: 2014-01-03
I would like someone to explain clearly what they mean by Eager Zeroed and Lazy Zeroed in Vmware vernacular.

if you back it up with an example it will be much helpful

Thank you
0
Comment
Question by:jskfan
[X]
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
8 Comments
 
LVL 25

Assisted Solution

by:Tony Giangreco
Tony Giangreco earned 100 total points
ID: 39743481
Thick Provision Lazy Zeroed
Create a virtual disk in a default thick format. Space required for the virtual disk is allocated during creation. Any data remaining on the physical device is not erased during creation, but is zeroed out on demand at a later time on first write from the virtual machine.

Thick Provision Eager Zeroed
Create a thick disk that supports clustering features such as Fault Tolerance. Space required for the virtual disk is allocated at creation time. In contrast to the flat format, the data remaining on the physical device is zeroed out during creation. It might take much longer to create disks in this format than to create other types of disks.

https://pubs.vmware.com/vsphere-50/index.jsp#com.vmware.vsphere.vm_admin.doc_50/GUID-B13C46B5-979C-4E41-9088-25AD78FF41B8.html?resultof=%2522%2545%2561%2567%2565%2572%2522%2520%2522%2565%2561%2567%2565%2572%2522%2520%2522%255a%2565%2572%256f%2565%2564%2522%2520%2522%257a%2565%2572%256f%2522%2520
0
 
LVL 12

Assisted Solution

by:Vaseem Mohammed
Vaseem Mohammed earned 100 total points
ID: 39743632
In Lazy zero blocks are reserved but not formatted/cleared for new data. As the data comes in, the blocks are zeroed and new data is written.

In Eager Zero, blocks are reserved and formatted/cleared and ready to write new data

That's the reason why it takes time for Eager Zeroed virtual disk type to be created than Lazy zeroed virtual disk.
0
 
LVL 14

Assisted Solution

by:RickEpnet
RickEpnet earned 100 total points
ID: 39743663
In theory the Eager Zero should be faster that Thin or Lazy Zero.  In practice the difference is not really noticeable. However unless you are pressed for time if you are going to use Thick I would use Eager. Why not pay the price upfront of writing to the blocks instead of having your application or OS pay the price while it is running.
0
Ransomware: The New Cyber Threat & How to Stop It

This infographic explains ransomware, type of malware that blocks access to your files or your systems and holds them hostage until a ransom is paid. It also examines the different types of ransomware and explains what you can do to thwart this sinister online threat.  

 
LVL 120

Assisted Solution

by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 200 total points
ID: 39743675
There are good articles written here by fellow vExpert Frank Denneman, which discusses Storage DRS, and time taken to Storage DRS (Storage vMotion) different disks types!

http://frankdenneman.nl/2012/12/19/thin-or-thick-disks-its-about-management-not-performance/

http://www.yellow-bricks.com/2012/12/19/death-to-false-myths-the-type-of-virtual-disk-used-determines-your-performance/

which came about from these articles discussed by other fellow vExpert Eric Sloof

http://www.ntpro.nl/blog/archives/2241-Mythbusting-Disk-provisioning-type-doesnt-affect-performance.html

I would give them all a read, because it's also now storage related, e.g. what type of SAN, and technology do you use.
0
 

Author Comment

by:jskfan
ID: 39745216
***if the storage is brand new, no data in it…the lazy and eager zeroed still applies..??

*** is lazy/eager zeroed new term in vmware Vsphere or it has been used in the previous versions of Vmware ??
0
 
LVL 120

Accepted Solution

by:
Andrew Hancock (VMware vExpert / EE MVE^2) earned 200 total points
ID: 39745287
***if the storage is brand new, no data in it…the lazy and eager zeroed still applies..??
- Yes, it based on the creation of the VMDK.

*** is lazy/eager zeroed new term in vmware Vsphere or it has been used in the previous versions of Vmware ??

These terms have been around for many years, in terms of VMDK format, but not always available from the GUI, or able to create the disks from scratch via a wizard!
0
 

Author Closing Comment

by:jskfan
ID: 39748910
Thank you
0
 
LVL 120
ID: 39754690
12% Performance Increase if you use Eager Zero - tested!
0

Featured Post

Three Reasons Why Backup is Strategic

Backup is strategic to your business because your data is strategic to your business. Without backup, your business will fail. This white paper explains why it is vital for you to design and immediately execute a backup strategy to protect 100 percent of your data.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Unable to remove VSphere from Host Machine 5 78
VMWare ESXi Guest CPU 8 84
VM sizing 2 43
VM backup 1 49
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.
When rebooting a vCenters 6.0 and try to connect using vSphere Client we get this issue "Invalid URL: The hostname could not parsed." When we get this error we need to do some changes in the vCenter advanced settings to fix the issue.
Teach the user how to install ESXi 5.5 and configure the management network System Requirements: ESXi Installation:  Management Network Configuration: Management Network Testing:
Teach the user how to convert virtaul disk file formats and how to rename virtual machine files on datastores. Open vSphere Web Client: Review VM disk settings: Migrate VM to new datastore with a thick provisioned (lazy zeroed) disk format: Rename a…

733 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