Home > Blogs > VMware VROOM! Blog


Scale-Out Performance of Exchange 2010 Mailbox Server VMs on vSphere 4

This is the third part in a series of blog posts on Exchange 2010 performance on vSphere 4.  In the first post, tests were done to show the scale-up performance of a single Mailbox Server VM hosting up to 8000 users.  The second post was about how increasing the amount of RAM would reduce the number of IOPS, resulting in better performance.  This article is about scale-out performance with multiple Exchange 2010 Mailbox Server VMs.  For a variety of reasons, it often makes sense to have more than one Mailbox Server in an Exchange environment.  Testing was conducted in VMware labs to determine the performance impact of spreading the same number of users across multiple VMs as opposed to running them in a single VM.  The results showed that great performance was maintained with only a slight increase in latency when scaling out with either of the 4000 or 8000 user scenarios.

Configuration

The same configuration was used as in the previous two blogs.  A Dell PowerEdge R710 with dual quad-core Xeon X5570 processors and 96GB of RAM was installed with a development version of vSphere 4 (build 235768).  In the previous tests, there were three Exchange VMs running on the vSphere server: Mailbox, CAS, and Hub.  For these scale-out tests, the number of Mailbox Server VMs was increased to 4 and the CAS and Hub Server VMs were moved to another vSphere server.  This resulted in only four Mailbox Server VMs running on the vSphere server being tested.

Storage for the VMs was increased to provide additional space for the new Mailbox Server VMs.  The number of data LUNs was doubled, resulting in four 9-disk RAID 5 LUNs with each VM having virtual disks on all of the LUNs. 

Microsoft Exchange Load Generator 2010 Beta was used to simulate the users for the scale-out tests.  The Online Outlook 2007 Very Heavy profile with 100 MB mailboxes was used.  The option to have all LoadGen Users pre-logon was set, and the rest of the settings for LoadGen 2010 beta were left at default values. 

Testing

In order to test the scale-out performance of Exchange 2010 on vSphere, the same number of users were run on a single Mailbox Server VM, two Mailbox Server VMs, and four Mailbox Server VMs.  The total amount of memory and vCPUs was kept constant and the users were evenly divided across the VMs.  The charts below show the results for 4000 and 8000 user tests across one, two, and four VMs.

ScaleOut_SendMailRT_IOPS 
The performance in the 4000 user tests shows a rise of only 30ms in the 95th percentile SendMail response time between a single 4-vCPU VM and four 1-vCPU VMs.  The 8000 user tests show an increase of approximately 140ms in the same metric when comparing the single 8-vCPU VM with four 2-vCPU VMs.  Even though this is a significant percent increase, the absolute increase is still relatively small in comparison to the 1 second threshold which is where users will begin to perceive a difference in performance. 

The reason for the increase in response time is due to an increase in IOPS, which puts additional load on the storage array and disk latency increases slightly.  IOPS increases as VMs are added, even though the number of users stays the same, because using four smaller caches is less efficient than one large cache.  This shows that Exchange 2010 does a good job of managing large caches when the RAM is available.

Another way to look at the data is to compare the same size VMs being used to support an increasing number of users.  A single 4-vCPU VM supporting 4000 users had a 95th percentile SendMail latency of 234ms and two 4-vCPU VMs supporting 8000 users had 314ms.  Doubling the workload on the server with an additional Mailbox Server VM resulted in an increase of only 80ms. 

Conclusion

Performance of Exchange 2010 in the scale-out tests on vSphere was great with response times well below 1 second. vSphere allows Exchange 2010 architects to have the flexibility to use multiple mailbox server VMs to create and manage their Exchange 2010 environment as their needs dictate and get great performance.  At the same time testing indicated there is the opportunity to reduce IOPS by using fewer mailbox server VMs with larger RAM sizes instead of using a greater number of mailbox server VMs with less RAM.   This aspect of Exchange 2010 performance is due to Exchange 2010’s ability to efficiently manage the larger memory size.

19 thoughts on “Scale-Out Performance of Exchange 2010 Mailbox Server VMs on vSphere 4

  1. Lotto Black Book System

    It is appropriate time to make some plans for the future and
    it’s time to be happy. I’ve read this post and if I could I want to suggest
    you some interesting things or tips. Perhaps you can write next articles referring to this
    article. I desire to read more things about it!

    Reply
  2. www.sexcamgirls4u.com

    Today, I went to the beach front with my kids.
    I found a sea shell and gave it to my 4 year old daughter and said “You can hear the ocean if you put this to your ear.” She put
    the shell to her ear and screamed. There was a hermit crab inside and it pinched her ear.
    She never wants to go back! LoL I know this is completely off topic but I had to tell someone!

    Reply
  3. website

    My brother suggested I may like this website. He used to be totally right.
    This submit truly made my day. You can not believe simply how much time I had spent for this information!

    Thank you!

    Reply
  4. fifa 14 ultimate coins hack

    Attractive element of content. I simply stumbled upon your web site and in accession capital to claim that I
    get actually enjoyed account your blog posts. Anyway I’ll be subscribing on your
    feeds and even I achievement you get entry to constantly fast.

    Reply
  5. tripadvisor reviews 8comic xd wheels

    You just need to enter your weight and height and the app’s advanced algorithms will do the trick for you.
    Lift your tongue up to the roof of your mouth and hold it there for five seconds.
    Whatever you do, don’t waste your money on “double chin fixes” such as the
    Neckline Slimmer. 10 Creative Ways to Keep More of Your Hard-Earned Money.
    I started to think I want to look good at the X-mas
    party and New Years Eve party.

    Reply
  6. Charlie

    When taking portraits in a studio environment with a portrait backdrop, setting the aperture is less important.
    Look into the coffee, make a wish, for what better liquid suited to wishing that which comes from such sacred
    beans. This particular process involves the affected person to use
    chin wrap around the affected area for a particular time period on a regular process.
    It’s a great way to keep up your pregnancy fitness, tone your muscles and all that fresh air and Vitamin D is
    good for you too. I advise you see your doctor first to decide which diet program is ideal for
    you.

    Reply
  7. can you remove yelp reviews about utopia bakery d b wbrick

    Add to that the MP3 player that plays through built-in speakers or headphones that it shares with i – Rex (the Sony needs headphones),
    then you have a machine that is top of the class, and for
    which only the price was not right. Dora Talking Kitchen reviews
    and store locator available. Flow by Amazon can identify millions of products such as, DVDs, books, household items and more.
    And if you are familiar with coupons or promotional codes as they are often called,
    then you will know how to use them and what to look out for – like actually seeing the discount during checkout –
    just to make it real. Sometimes the most relevant reviews
    can come from your friends and family members.

    Reply
  8. http://chaturbatetokenshack.webs.com

    Defense against Chaturbate Token Hack and other sensitive information
    As the requirement for dependable and commanding security gains importance and the principles and requirements set by the Payment
    Card Industry progress to meet that need, the requirement for cutting edge resolutions will also upsurge.
    As hackers find new ways to blunder tokens in a system like Chaturbate Token Hack, fresh ways to
    safeguard sensitive information also requires development.

    The security flaunts that are used
    Conventional security is showing its drawbacks and proving
    itself to be inadequate in this digital age which are used in the present scenario.
    This is becoming more and more obvious as most people get
    more news about corporations that have been suffering from a hole of some kind or
    the other regarding safety issues. Often those
    firms have been under the fact that meek encryption is sufficient to defend
    sensitive token and other data like credit card data on their
    own sites. Unluckily, chaturbate token generator has
    lately become obvious that the concept is not true
    anymore.
    In this scenario free chaturbate tokens are one of the most essential prospects of this tool.
    Very frequently the data safety procedures are exploited or inadequately managed, and hackers can get a grip over the encryption secrets or find other
    glitches and cause serious destruction and obvious distress.
    Credit card tokenization is swiftly flattering
    one of the finest ways to contrivance proper safety and reach PCI obedience.
    The procedure works in this way, like a credit card, a token or debit card
    or any other payment technique is used in a money transaction, either on the web or any other electronic mean, and the original data
    is sent to the company which actually provides the tokenization facilities.
    One can get to know more about free chaturbate tokens in various
    websites.
    Directly after, a randomized and unique number is produced and
    sent to the user. This digit is considered as the
    token, is the solitary object that needs to be kept in a system that is internal.
    Conversely, if one stocks private evidence on their own system, they
    are the one liable for efficiently handling
    and constantly checking that information.
    But that is not enough to detect any kind of suspicious activity.

    Nobody can conclude that the hackers will not reach the computer via electronic means.
    Besides if you need more information about chaturbate token generator then do a little research from various sites.

    Conclusion
    Credit card tokenization was intended to help a user
    to remove those doubts of hacking. A user should end keeping delicate information on their individual system that may be a
    computer, laptop, a Smartphone or any other similar devices and
    transfer it to a system which is continuously as well as
    efficiently observed, safe, and updated.

    This can reduce other chances of hacking which also includes
    Chaturbate Token Hack as no data or sensitive information is
    kept on the user’s system.

    Reply

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>