Tag: Hyper-V

Leverage Redundancy to Improve System Uptime

In the business world just a couple of decades ago, a certain amount of occasional downtime was almost expected in business systems.  It wasn’t uncommon for email systems, web servers, and file/applications servers to need occasional reboots, fall victim to memory leak errors, succumb to internet outages, or crash all together.  Avoiding unplanned downtime was possible, but doing so tended to be very costly for a truly redundant solution.  This limited the highly coveted 4 and 5 nines (9.999% and 9.9999%) of uptime to the large enterprise environments which could afford this level of redundancy.

Since then, even the smallest businesses have become less and less accepting of unplanned downtime in our production environment.  After all, our internet provider connections have become much more affordable to allow redundant connections, power protection is the norm, and operating systems have become much more reliable (though at times it doesn’t always feel that way).

SaaS (software as a service) and PasS (platform as a service) solutions like Microsoft 365, Azure SQL services, Azure Virtual Desktop, Azure Front Door, and others, often build in redundancies or make them easily deployable.  But what if you are still running virtual machines in the Azure cloud or in your on-premises environment?

It also goes without saying that taking the appropriate posture on cybersecurity and employing a good data backup solution is critical, but for the purpose of this discussion, I will stick to redundancy options.

Protecting Virtual On-Prem

Whether you’ve invested in Hyper-V or VMware for your virtualization hypervisor platform, there are a few things to consider.

  • Redundant networks – Multiple physical host adapters for management and VM traffic, preferably all connecting to different network switches.
  • Redundant power – Multiple power supplies in each virtualization host, each connected to a different UPS (uninterruptible power supply). Having a backup generator on top of this is a plus for any power outage beyond a few minutes.
  • Scale-out file server / SAN – Storage used by the hypervisors should be well thought out, allowing for resiliency not just within disk sets, but between disk arrays. Don’t just plan on individual disks failing. Disk controllers and even entire arrays can have critical issues. 
  • VM (virtual machine) clustering – Just like everything else, virtualization hosts are not immune to having issues.  Failover clustering allows a VM to automatically (or sometimes manually) start up on a different host when its primary host is either down unexpectedly or needs maintenance.  Clustering in the VMware world is pretty simple leveraging vSphere.  In Hyper-V, clustering is a little more complicated, but Microsoft has a lot of great resources to help you along the way.  There are also some really great 3rd party tools to manage failover and make failback a cinch. 

Storage Redundancy and SLAs

Storage in Azure has multiple resiliency options depending on your uptime requirements. Here are a few of Microsoft’s SLA (service level agreement) guaranteed uptimes for Azure Storage:

  • At least 99.99% (99.9% for Cool and Archive* Access Tiers) of the time, we will successfully process requests to read data from Read Access-Geo Redundant Storage (RA-GRS) accounts, provided that failed attempts to read data from the primary region are retried on the secondary region. Rehydration is not supported in the secondary region.
  • At least 99.9% (99% for Cool and Archive* Access Tiers) of the time, we will successfully process requests to read data from Locally Redundant Storage (LRS), Zone Redundant Storage (ZRS), and Geo Redundant Storage (GRS) accounts.
  • At least 99.9% (99% for Cool and Archive* Access Tiers) of the time, we will successfully process requests to write data to LRS, ZRS, GRS accounts, and RA-GRS accounts.

Protecting Azure Virtual Machines

Simple VMs in Azure should have at least a 95% uptime guarantee from Microsoft without any additional work.  If 95% uptime is not quite good enough, there are plenty of options to improve this score considerably.

For example, you can expect a 99% SLA simply by using Premium SSD, Ultra Disk, or Premium SSD v2 for all Operating System Disks and Data Disks. 

Availability Zones in Azure. Source: Microsoft

An Availability Set is two or more VMs deployed across different Fault Domains to avoid a single point of failure. When deploying two or more VM instances in the same Availability Set or in the same Dedicated Host Group, you can expect an SLA of up to 99.95%. 

Availability Zones are fault-isolated areas within an Azure region, providing redundant power, cooling, and networking.  They can make reliability even better with an SLA of up to 99.99% when two or more instances are deployed across two or more Availability Zones in the same Azure region.

Availability Sets and Availability Zones can be leveraged for VMs and also with Azure Virtual Desktop (AVD) to ensure a significant reduction in any single point of failure.

If you are planning an AVD deployment, then also consider On-Demand Capacity Reservations, since it will guarantee you will receive compute capacity up to the reserved quantity of VMs at least 99.9% of the time.

For more, here is a list of Microsoft’s SLAs for online services: https://azure.microsoft.com/en-us/support/legal/sla/

Permanent link to this article: https://www.robertborges.us/2022/12/cloud-computing/leverage-redundancy-to-improve-system-uptime/

Rethinking Backup with Veeam

I am a worry wart when it comes to backing up data. For my critical systems, I never trust a single backup method, but rather I implement several different strategies for backup and disaster recovery. For the past two years, one of those methods has been using Veeam Backup and Recovery.

Traditionally, Veeam has been a product to backup virtual machines (VMs) hosted on either Hyper-V or VMware hosts. They specialized in backing up the entire VM to disk quickly and easily using encryption and/or deduplication. Daily backups are incremental, as they only backup the bits of virtual disks that actually changed since the last backup. This makes incremental backups very quick, and requires very little disk space compared to comparable solutions. The product also made it very easy to restore an entire VM to any host running the same hypervisor platform.
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Permanent link to this article: https://www.robertborges.us/2015/01/virtualization/rethinking-backup-with-veeam/

Export a Running Virtual Machine Using PowerShell

Exporting a Hyper-V VM (virtual machine) creates a full copy of that VM. This can be used as an easy way to create an ad-hoc backup or an archive. An export can also contain all of the existing checkpoints that exist, so it is a really helpful tool during deployments, migrations, and upgrades. Continue reading

Permanent link to this article: https://www.robertborges.us/2014/07/virtualization/export-a-running-virtual-machine-using-powershell/

What’s New in Windows Server 2012 R2 Lessons Learned Week 1

It has been an incredible start to the Windows Server 2012 R2 Launch Series.  Here is brief summary of the 9 posts we covered so far… Continue reading

Permanent link to this article: https://www.robertborges.us/2013/10/learning-resources/whats-new-in-windows-server-2012-r2-lessons-learned-week-1/

Importing & Exporting Hyper-V VMs in Windows Server 2012 R2

HyperV_LogoThough often a less frequently used feature of Hyper-V, the import and export functions offer some very useful benefits.  In Windows Server 2012 R2 these benefits get even better.  I will explain how this functionality works, and why it is useful.  I’ll also discuss how these functions are very different from the commonly used checkpoints in Hyper-V. Continue reading

Permanent link to this article: https://www.robertborges.us/2013/10/windows/windows-server-2012/importing-exporting-hyper-v-virtual-machines-in-windows-server-2012-r2/

Windows Server 2012 Feature: Share Nothing Live Migration in Hyper-V

Live Migration is the process of moving a virtual machine (VM) from one Hyper-V virtualization host to another Hyper-V host without any perceived downtime of the VM being moved. Continue reading

Permanent link to this article: https://www.robertborges.us/2013/08/windows/windows-server-2012/windows-server-2012-feature-share-nothing-live-migration-in-hyper-v/

Windows Server 2012 R2 (Blue) Preview Available for Download

Microsoft has released the preview of Windows Server 2012 R2 to the public. This is available for download for users with a Live ID at Microsoft’s Windows Server 2012 Preview site.

If you’re not familiar with Microsoft’s “Preview Releases”, then let me explain a little. The preview is not a finished copy, but rather a beta version which contains most (if not all) of the features and improvements we should expect to see in the final version for GA (general availability). Continue reading

Permanent link to this article: https://www.robertborges.us/2013/06/windows/windows-server-2012/windows-server-2012-r2-blue-preview-available-for-download/

Getting Better Performance for Your Virtual Machines

As a seasoned virtualization expert (mostly with Hyper-V environments), I totally agree with the concept of building your VMs (virtual machines) and virtualization hosts to meet a particular need.

Often, I talk to SQL DBAs (database administrators) or Exchange administrators who swear that these platforms can NEVER be virtualized. This line of thinking is so wrong that Microsoft itself has bet their business around it (e.g., Office 365, Microsoft.com, etc.).

The most important piece of advice I give to virtualization newcomers is to treat a VM like you would a physical server. If a physical Exchange server needs 16GBs of memory and 4 CPUs, then building a VM with only a single virtual processor and 2GB of memory is going to result in a bad user experience, obviously.

HDD (hard disk drive) performance is always a concern with VMs. If you are creating a VM to run a disk intensive SQL server, then you will certainly care about your disk performance. With the more recent versions of Hyper-V, there is little noticeable performance reduction when choosing dynamically expanding VHD (virtual hard disk) vs. using a fixed size VHD. The big downside is that you now have to monitor and manage your storage on the host since your VMs can quickly consume physical space.

If extra disk performance is really needed, there is an option of using a pass-through disk. Pass-through disks will use an unused volume on the physical Hyper-V host as if that volume were its own. With pass-through disks you’ll get true hardware-level performance. The downside is that your VM is now tied to this physical storage making it difficult (or impossible) to migrate to a different host… so plan accordingly.

 

 

Permanent link to this article: https://www.robertborges.us/2013/05/virtualization/getting-better-performance-for-your-virtual-machines/

Windows Server 2012 New Feature: Hyper-V Replica for Failover

For mission critical systems, we often want to try to achieve the highest level of up time as possible, and the best disaster recovery strategy.  Often this involves expensive software which replicates servers or data for failover purposes.  This means Continue reading

Permanent link to this article: https://www.robertborges.us/2013/04/windows/windows-server-2012/windows-server-2012-new-feature-hyper-v-replica-for-failover/

Windows Server 2012 New Feature: Large Disk Support for Hyper-V

One of the biggest limitations of Hyper-V in Windows Server 2008 R2 was that it didn’t support storing a Virtual Hard Disk (VHD) on physical disks larger than 2 TB.  This was actually due to the sector size of the physical disk which was supported by Hyper-V.  Larger disks tended to use 4096-byte sectors (also known as 4k sectors).   Continue reading

Permanent link to this article: https://www.robertborges.us/2013/03/windows/windows-server-2012/windows-server-2012-new-feature-large-disk-support-for-hyper-v/

Windows Server 2012 New Feature: Store Hyper-V VHDs in a SMB 3.0 Share

When building high-performance Hyper-V host servers for a production environment, we often buy high-end servers with lots or memory and fast SAS (Serial Attached SCSI) or SSD (Solid State) drives.  These drives are fast but usually expensive, especially after adding in RAID redundancies. Continue reading

Permanent link to this article: https://www.robertborges.us/2013/03/windows/windows-server-2012/windows-server-2012-new-feature-store-hyper-v-vhds-in-a-smb-3-0-share/

Introducing Hyper-V Quick Migration

In the Hyper-V world, lots of us talk about Live Migration. That is where a virtual machine (VM) is moved from one host to another with no perceived downtime. The caveat is that both hosts need be configured to use the same shared storage (such as a SAN or external drive array). Continue reading

Permanent link to this article: https://www.robertborges.us/2012/07/windows/windows-server-2008-r2/hyper-v-quick-migration/

Learning Tools & Resources from Microsoft

On many occasions I have had people ask me “Where can I learn about Microsoft’s product X”, or “Is there anywhere I can go to get free training”. Well, here is a list of just a few of the resources Microsoft provides to us all so we can get educated and try out many software titles before making an investment. Continue reading

Permanent link to this article: https://www.robertborges.us/2012/04/learning-resources/learning-tools-resources-from-microsoft-2/

Deep Dive 2012 Registration is open

The Fourth Annual Virtualization Deep Dive Day is in coming soon. New date and new location this year. Bigger and Better than ever!

The Keynote for the event will be delivered by Brian Madden, world famous blogger and speaker on Desktop and Application Virtualization.

In “The Current State of the Desktop Virtualization Market”, Brian will take us beyond the hype and speak about what real enterprises are actually doing. In his role as a professional blogger (Really? You can make money doing that?) for the self-named BrianMadden.Com, a Tech Target Company, Brian travels the world speaking with both leading edge vendors and with companies that are implementing these technologies. With all of the choices on how to provision desktops and applications, what are people doing and why? Brian talks about these questions, but not just from an IT perspective, also from the view of end users.

Brian Madden Independent Industry Analyst and Blogger. He is known throughout the world as an opinionated, super technical, fiercely independent desktop virtualization expert.
Be sure to arrive early to get a good seat for this one!

Be sure to register by Feb 17th for the Early Bird Discount!

http://deepdive2012.eventbrite.com/

For more information about the Virtualization Deep Dive Day 2012 event visit the Virtualization Group Boston’s website at http://www.virtg.com/DeepDiveDay2012.

 

 

 

 

 

 

 

 

Permanent link to this article: https://www.robertborges.us/2012/02/events/deep-dive-2012-registration-is-open/

SP1 RC for Windows 7 and Windows Server 2008 R2 Released

microsoft-logoMicrosoft has released the Release Candidate (RC) of Service Pack 1 (SP1) for Windows 7 and Windows Server 2008 R2 to MSDN and TechNet subscribers.
Why is this so important, and why do I care? Within SP1 are two of my favorite feature updates: Dynamic Memory for Hyper-V, and the RemoteFX update for Remote Desktop Services.

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Permanent link to this article: https://www.robertborges.us/2011/02/windows/windows-7/sp1-rc-for-windows-7-and-windows-server-2008-r2-released/