?
Solved

Defrag your SAN (exchange, VMWare, SQL)

Posted on 2010-11-21
6
Medium Priority
?
1,039 Views
Last Modified: 2013-11-14
Hi,

Just wondering how many of you defrag your SANs, and if you had experience with doing so when you have any of the servers running there data on the storage (exchange, SQL and VMWare) when Mirroring is enabled?

At the moment we only do Mirroring from one site to another out of work hours, but i read doing defrags can kill the mirror because the newly defragged disk is so different to the disk its being mirrored to.

Anyone have any horror stories? or is this good practise and you've found a performance ++ from doing so? I can see a certain benefit to it but im worried how each server will react it especially VMWare (Which i know very little about) and how often it may kill the mirror and have to be recreated again.

Thanks for any advice all gratefully received

S
0
Comment
Question by:stebennettsjb
[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
6 Comments
 
LVL 15

Expert Comment

by:getzjd
ID: 34185428
The rule of thumb I have always understood is that defragging a SAN could actaully decrease the performance.  
0
 

Accepted Solution

by:
l4nc3r earned 1000 total points
ID: 34185500
From what I've read and noticed on our production servers, there should be no reason to defragment your SAN array.  If you are using Virtual Machines hosted on the SAN's, you'll be fine.  Just treat your virtual servers like physical machines and defrag those.  I've noticed a major difference in performance after running a defrag on our main file server.  If you are going to get nitty gritty, you can also defrag your .vmdk files via VMWare, but I hear that the gain is very minimal.

Also know that if you use Veeam with reverse-incremental backups, the backups will most likely be much larger than normal for a day or two.  
0
 
LVL 24

Assisted Solution

by:Luciano Patrão
Luciano Patrão earned 1000 total points
ID: 34186090
Hi

Defrag on LUN level(like RAW Disks) is wrong and will decrease the performance and will take ages to finish.

If you want to defrag the Virtual Disks(inside on the Windows), yes that is ok. Here you can manage the defrag as a normal physical server.

Again, never defrag RAW disks.

Jail
0
Does Your Cloud Backup Use Blockchain Technology?

Blockchain technology has already revolutionized finance thanks to Bitcoin. Now it's disrupting other areas, including the realm of data protection. Learn how blockchain is now being used to authenticate backup files and keep them safe from hackers.

 
LVL 12
ID: 34186193
Defrag SAN = Bad Idea
0
 

Author Closing Comment

by:stebennettsjb
ID: 34186792
Thanks for the replies, clears it up..
0
 

Expert Comment

by:Shanibasha
ID: 34489174

In overall you can use a disk alignment tool (Paragon Alignment tool for example) to align SAN disks  of heavy duty applications like exchange, data ware house and defrag tool to run as a background application. Running defrag tool from "diskeeper" in background has given good performance improvement in file servers, dataware houses and exchange backend servers.
0

Featured Post

Secure Your WordPress Site: 5 Essential Approaches

WordPress is the web's most popular CMS, but its dominance also makes it a target for attackers. Our eBook will show you how to:

Prevent costly exploits of core and plugin vulnerabilities
Repel automated attacks
Lock down your dashboard, secure your code, and protect your users

Question has a verified solution.

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

The business world is becoming increasingly integrated with tech. It’s not just for a select few anymore — but what about if you have a small business? It may be easier than you think to integrate technology into your small business, and it’s likely…
Many businesses neglect disaster recovery and treat it as an after-thought. I can tell you first hand that data will be lost, hard drives die, servers will be hacked, and careless (or malicious) employees can ruin your data.
This video teaches viewers how to encrypt an external drive that requires a password to read and edit the drive. All tasks are done in Disk Utility. Plug in the external drive you wish to encrypt: Make sure all previous data on the drive has been …
This Micro Tutorial walks you through using a remote console to access a server and install ESXi 5.1. This example is showing remote access and installation using a Dell server. The hypervisor is the very first component of your virtual infrastructu…
Suggested Courses

777 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