How many vms

One system is gleefully running about 75 Linux VMs each playing around endlessly with a bunch of webserver testloads and I haven't been able to tip it over yet.

The other system is running 4 VDI instances, an Exchange server, a database and 5 render engines for some heavy-duty photo-rendering stuff. It's not so bad if you have local disks, but as soon as you start trucking out across the network you can get into deep caca. If you are using old DDR2 servers - and many still are, especially for test and home labs - then you can easily run into RAM bandwidth issues.

Let me give you a quick tip here: don't use the RAM deduplication features of your hypervisor unless absolutely necessary on anything that isn't DDR3. I promise you you'll head the wall on bandwidth. If you absolutely must cram as much as possible into that server and damned be the RAM bandwidth!

They have the ability to turn a local SSD into the swapfile store and that can make your life a lot happier. Network bandwidth can be a problem to, so be careful how you spec things. Please also consider SSD versus spinning disk. SSDs are only good if you are not doing all sorts of little bitty writes. You need something that will lay down your writes in complete blocks, and preferably be read-intensive, not write-intensive.

If you do choose disk, higher RPMs are, of course, better NCQ is absolutely required, but going for an enterprise-class disk is probably your best bet, rather than trusting that the consumer NCQ is going to be of any use to you. The reason you care - beyond the warrantee on the drive - is that server disks are both optimized for long strings of more random traffic basically they flush their disk queues in a more efficient pattern for multiple threads accessing the device and they tend to have timeouts for discovered errors set up in such a way that they can be used in RAID arrays without having a perfectly good disk drop out for no apparent reason.

Agree with mjolly about the need to be certain about 4 cores HT's vs 8 true cores, definitely would affect the math.. Also note that newer processors are "HT"'d differently - they are considered a "LP" logical processor by Microsoft. Here is a good technet article re: supported configurations. Exceeding the "Max" is possible, but probably not desirable. I looked into this issue because I had overbooked the CPU's by assigning too many virt procs to too many virtual machines.

We have 2 of them 6-core cpu's in a dual cpu blade setup and it will show 24 cpu's 12 real, 12 HTs. You should also place limits on how many VMs each department can create to keep your virtualized environment small and manageable. VM inventory Documenting every VM in your network should be standard protocol in your company.

They should be organized by their purpose e. This will make it easier to review which VMs are necessary to your operations and decommission the ones that no longer serve a purpose. Such tools allow you to set time-based policies that remove VMs that were needed for only a short time e.

Although virtualization is a powerful solution, it must be carefully managed if you want to realize its cost-cutting and efficiency-boosting benefits. If you want to truly benefit from virtualization, call us today. Skip to content. Contact Us. Skip to content I saw a question get posted on twitter that kind of intrigues me a little. Steve, Nice article.

With this configuration, how much VMs can I get? This site uses cookies. Some of them are essential, while others help us improve your experience. Accept Read More. Privacy Policy. Close Privacy Overview This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website.

We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies.

But opting out of some of these cookies may affect your browsing experience. Necessary Necessary. Necessary cookies are absolutely essential for the website to function properly.