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MichalSumega-1475 avatar image
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MichalSumega-1475 asked ·

Protecting VM with Premium SSD

Hello all,

I've been doing some research and are still a bit confused about this...

I'm a bit lost in VM with Premier SSD. I'm not trying to achieve better SLA by putting VMs to AS or AZ, I'm just wondering in what situation I may loose the VM and data on it. I've found that a Single VM with Premium SSD has SLA 99.90%, but this is not what I'm trying to find out. Let's say it is a VM running a company finance software with a small SQL database and it is not used on a daily bases at all..

So, I have a VM with Premium SSD, which means that the data are replicated locally only, as I've found out. Now:

  • is this within the same fault domain?

  • if there is a disaster - the Azure DC is hit by a meteor - is MS taking some backups and they are able to restore/rebuild the DC and data including my VM?... and I will see the VM alive again :)? Or the VM is gone for good, and if I do not have backup, I'm done.

... I know this is probably quite stupid question, but was trying to find an answer for a while already :)

thanks

azure-virtual-machinesazure-managed-disks
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2 Answers

JessicaH-MSFT avatar image
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JessicaH-MSFT answered ·

Hi Michal,

Not a stupid question at all. Keeping your data safe and available is important work.

Although your VMs and disks are normally protected from localized failures, additional steps are necessary to protect your workload from region-wide catastrophic failures, such as a major disaster, that can affect your VM and disks.

For regional disaster recovery, you must back up your IaaS VM disks to a different region.

There are a lot of options to protect your data and make sure it is available when you need it. More information can be found here:
https://docs.microsoft.com/en-us/azure/virtual-machines/backup-and-disaster-recovery-for-azure-iaas-disks

I hope this helps!

Best,
Jessica

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sheahandc avatar image
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sheahandc answered ·

Hi

This is common question, Azure Copy "Locally redundant storage (LRS) replicates your data three times within a single physical location in the primary region. LRS provides at least 99.999999999% (11 nines) durability of objects over a given year."

They keep a copy of your data in case of disaster. They use that backup in case of a disaster to give Access to the customer within the agreed SLA. If you want something more than that, Like You need to access your data During the Disaster even before they do recovery of there Data Center, you have to choose other Redundancy options. Please find the below link for all the Redundancy options related to the Manage Disk.

https://docs.microsoft.com/en-us/azure/storage/common/storage-redundancy#locally-redundant-storage

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MichalSumega-1475 avatar image MichalSumega-1475 ·

Hi... had been reading through those materials already.... There is this mention - "However, if a disaster such as fire or flooding occurs within the data center, all replicas of a storage account using LRS may be lost or unrecoverable"... So I was wondering whether MS keeps copy of data somewhere and will eventually restore it... or it is all gone if I did not take backups... Cosider there is a server that is not mission critical and can be off for days/weeks....

I will implement a backup plan anyway, ... it is just somehting I am courious and can't get it off my head :)

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