Disaster Recovery – Do you really need one?

 Last week, Microsoft announced the Preview of Capacity Reservation for VMs. You can reserve VM capacity in your DR region to ensure that you have VM resources available to create or turn on your protected VMs using ASR. ASR does not guarantee that your VMs can be turned on in your DR region in the event of disaster recovery. So, capacity reservation is a welcome feature and much needed. However, this is increasing the cost of your solution again.

  • Cost factors
    • VM cost
    • ASR protected VM cost
    • Capacity Reservation Cost ( as same as your actual VM cost)
    • other costs

Note: DR is not just the VMs but including other components. I did not provide the details above because it applies to both the options.

Hmm.. Can we plan a DR cost-effectively in Azure? Let’s take a look:

Continue reading “Disaster Recovery – Do you really need one?”

Review of Preview – Azure Capacity Reservation

The long waiting feature is now Public Preview. When there is a Azure region disaster recovery, we need our VMs to be turned on in the secondary region. This feature guarantees you the recovery. You may learn about this feature in this URL

As you know already, Azure Site Recovery does not 100% guarantee to turn on your VMs in the event of DR. This feature addition helps you gaining more confidence with your BCP with this feature addition. 

  • Take a look at the Microsoft statement about the use cases for this feature. 
    • Business-critical applications—use on-demand capacity reservations to protect your capacity, for example when taking these VMs offline to perform updates.
    • Disaster recovery—you now have the option to set aside compute capacity to ensure a seamless recovery in the event of a natural disaster. The compute capacity can be repurposed to run other workloads whenever DR is not in effect. The VM maintenance can be handled by keeping core images up to date without the need to deploy or maintain VMs outside of DR testing.
    • Special events—claiming capacity ahead of time provides assurance that your business can handle the extra demand.

I have been asking for this feature for a long time now, and finally, it is here. I am happy about Microsoft as they are listening to customers and partners. However, the first bullet point is a bit worrisome as it states, It is not guaranteed to get your VM back if it is offline for some time due to maintenance. Does MSFT force customers to take this for all the critical workload? I hope they do not make things worse to this point. 

Continue reading “Review of Preview – Azure Capacity Reservation”

Can Public Cloud Turn All Your Protected VMs ON in another Region during the Region Fail-over?

It is an interesting point to discuss. I am taking example of Azure here but it is applicable to other Public Clouds as well.

Azure Site Recovery is great native tool which helps us enable disaster recovery (DR) by replicating VMs to another region with few clicks. Microsoft allows you to turn the VM ON during the disaster recovery or whenever you want to. It helps you saving the running cost of VMs for the DR set up. However, Can Microsoft Turn all the VM On in the secondary region if a region fails? How many of you thought about that scenario?

My concerns around this grew more and more last year during the early covid19 period when utilization peaked to a new height. There were lot cases reported that organizations were unable to create new VMs as Microsoft data centers including Azure region were running out of resources due sudden usage spike across the world.  What would happen if thousands of customers in a region wanted to start their VMs in their secondary Azure region which results starting lakhs VMs on the same day.

Continue reading “Can Public Cloud Turn All Your Protected VMs ON in another Region during the Region Fail-over?”