Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Best practice in defragging Virtual servers. ESXi 4.1, Server 2008 R2.

Posted on 2012-04-02
7
Medium Priority
?
1,699 Views
Last Modified: 2012-04-04
Can you defrag a virtual servers disks like with a physical server?
If I run a defrag on a virtual server, It only analyses the disc and the defrag finishes instantly.

We have several Equallogic SAN's which host the volumes for each virtual guest server.
VM's are managed via vCentre 4.1

What is the best practice in defragging volumes with this design? is there one?
0
Comment
Question by:Mayogroup
  • 4
  • 2
7 Comments
 
LVL 40

Accepted Solution

by:
coolsport00 earned 1332 total points
ID: 37799018
I touched on this subject recently at this post:
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_27651590.html

Basically, you have to determine the need based off your virtual infrastructure setup. If you use Thin disks for VMs, it's most certainly a "no" because defrag'ing will touch all your disk and thus 'inflate' your VMDK to thick. This also affects CBT. If you read this brief article about defrag'ing, I think it'll answer your question and you can best decide if you should do it, but mostly, the answer is 'no':
http://blogs.vmware.com/vsphere/2011/09/should-i-defrag-my-guest-os.html

Regards,
~coolsport00
0
 
LVL 124

Assisted Solution

by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 668 total points
ID: 37799652
Contact you SAN vendor and ask for their recommendation,
0
 
LVL 40

Assisted Solution

by:coolsport00
coolsport00 earned 1332 total points
ID: 37800578
Yes, that is one of the recommendations in the article I posted. But again, if you're using thin disks for your VMs and you want to continue doing so, there's really no point in asking your SAN vendor...you really can't to a defrag. Also, in reality, the performance gain from a defrag tends to be negligible UNLESS there is a lot of file 'movement' that happens on a particular VM or VMs. Then there 'may' be some performance gain.

~coolsport00
0
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 

Author Comment

by:Mayogroup
ID: 37804314
All good. Thanks for the posts.
I am not trying to say I need to defrag. I realise this is no longer required for windows servers.
I am just wondering what the standard is for SAN technology. I assume there must be something I can do as ongoing maintenance around volumes and VMDK's etc?

I will contact the vendor.
0
 
LVL 40

Assisted Solution

by:coolsport00
coolsport00 earned 1332 total points
ID: 37804349
Yes...for SAN specific questions, you'll need to ask your vendor. I know EMC mostly doesn't require it..pretty sure Dell doesn't but others (NetApp, etc.) may.

~coolsport00
0
 
LVL 124

Assisted Solution

by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 668 total points
ID: 37805237
Make sure your Partitions in your VMDKs are ALIGNED!
0
 
LVL 40

Assisted Solution

by:coolsport00
coolsport00 earned 1332 total points
ID: 37805770
Good point @hanccocka. @Mayogroup - if you are using Windows OS's below 2K8/Win7, then I *highly* suggest this free tool:
http://nickapedia.com/2011/11/03/straighten-up-with-a-new-uber-tool-presenting-uberalign/

I have tested it out and it works well. There is a video in the URL (towards the bottom of the post) that helps show how to use it.
This thread talks about disk alignment more, as well:
http://www.blueshiftblog.com/?p=300 (this is the best blog on alignment I've seen out there IMO)

~coolsport00
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

If you troubleshoot Outlook for clients, you may want to know a bit more about the OST file before doing your next job. IMAP can cause a lot of drama if removed in the accounts without backing up.
With so many activities to perform, Exchange administrators are always busy in organizations. If everything, including Exchange Servers, Outlook clients, and Office 365 accounts work without any issues, they can sit and relax. But unfortunately, it…
This Micro Tutorial will teach you how to reformat your flash drive. Sometimes your flash drive may have issues carrying files so this will completely restore it to manufacturing settings. Make sure to backup all files before reformatting. This w…
To add imagery to an HTML email signature, you have two options available to you. You can either add a logo/image by embedding it directly into the signature or hosting it externally and linking to it. The vast majority of email clients display l…
Suggested Courses

886 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