Lost data on attached disk

Jaspreet Hothi 0

Hi,

I had created a windows VM with an attached 1TB premium SSD disk. Unfortunately, the VM froze and I had to shut it down. When I started the machine back up the attached disk was gone. The disk is still attached to my VM but is unallocated. The only way for me to access it is to create a new volume and format it. This will erase all data on the disk. Is there a way to recover the data? Please advice.

TIA

1 answer

risolis 8,741

Hello @Jaspreet Hothi

Thank you for posting this concern on this community.

I fully understand your request and I would be asking few questions below:

-Did you enable Azure Backup on your VM?

-Do you have any recovery policy in place?

-Have you tried to review the event viewer logs to see what process failed and deleted your data?

-Have you tried to create a new VM but by attaching that disk stated on your post description?

Looking forward to hearing from you

Cheers,

Please "Accept the answer" if the information helped you. This will help us and others in the community as well.

Jaspreet Hothi 0 Reputation points

2023-07-10T15:57:37.3033333+00:00

I did not enable backup. My understanding was that the attached disks are persistent with high reliability. Is this not the case? Does shutting down the VM erase all the data on the attached disk? Please see the attached image. Looks like shutting down the VM deallocated the resources. Is this supposed to happen? I was not using a storage account. Please advice.
risolis 8,741 Reputation points

2023-07-11T03:21:32.02+00:00

Thank you for your response.

I would like to know first, if you were setting up availability sets or zone for this.

Moreover, I wanted to double check which disk type is the one selected for this VM as stated on the link below:

https://learn.microsoft.com/en-us/azure/virtual-machines/disks-redundancy

Looking forward to hearing from you

Cheers,

Please "Accept the answer" if the information helped you. This will help us and others in the community as well.

Jaspreet Hothi 0

The disk type was premium LRS. I was not setting up availability sets or zones. Below is the snapshot of the activity log when deallocation happened. Looks like it took away the attached disks and then reattached them again but the data was lost in the transition.

TIA.

| |


Sun Jul 09 2023 14:11:39 GMT-0600 (Mountain Daylight Time)
properties.extended.instanceView.powerState.code	Update	User	PowerState/starting	PowerState/running
properties.extended.instanceView.powerState.displayStatus	Update	User	VM starting	VM running
properties.provisioningState	Update	System	Updating	Succeeded
properties.storageProfile.dataDisks["0"].managedDisk.storageAccountType	Add	User		Premium_LRS
properties.storageProfile.osDisk.managedDisk.storageAccountType	Add	User		Premium_LRS
Sun Jul 09 2023 14:11:36 GMT-0600 (Mountain Daylight Time)
properties.extended.instanceView.powerState	Add	User		{ "code": "PowerState/starting", "displayStatus": "VM starting", "level": "Info" }
Sun Jul 09 2023 14:11:18 GMT-0600 (Mountain Daylight Time)
properties.extended.instanceView.powerState	Remove	User	{ "code": "PowerState/deallocated", "displayStatus": "VM deallocated", "level": "Info" }
properties.provisioningState	Update	System	Succeeded	Updating
properties.storageProfile.dataDisks["0"].diskSizeGB	Add	User		1024
properties.storageProfile.osDisk.diskSizeGB	Add	User		127
Sun Jul 09 2023 14:05:20 GMT-0600 (Mountain Daylight Time)
properties.extended.instanceView.powerState.code	Update	User	PowerState/deallocating	PowerState/deallocated
properties.extended.instanceView.powerState.displayStatus	Update	User	VM deallocating	VM deallocated
properties.provisioningState	Update	System	Updating	Succeeded
Sun Jul 09 2023 14:05:13 GMT-0600 (Mountain Daylight Time)
properties.extended.instanceView.powerState.code	Update	User	PowerState/running	PowerState/deallocating
properties.extended.instanceView.powerState.displayStatus	Update	User	VM running	VM deallocating
properties.extended.instanceView.computerName	Remove	User	node1
properties.extended.instanceView.osName	Remove	User	Windows 10 Enterprise
properties.extended.instanceView.osVersion	Remove	User	10.0.19044.3086
properties.provisioningState	Update	System	Succeeded	Updating
properties.storageProfile.dataDisks["0"].managedDisk.storageAccountType	Remove	User	Premium_LRS
properties.storageProfile.dataDisks["0"].diskSizeGB	Remove	User	1024
properties.storageProfile.osDisk.managedDisk.storageAccountType	Remove	User	Premium_LRS
properties.storageProfile.osDisk.diskSizeGB	Remove	User	127
Sun Jul 09 2023 14:02:29 GMT-0600 (Mountain Daylight Time)
properties.extended.instanceView.powerState.code	Update	User	PowerState/starting	PowerState/running
properties.extended.instanceView.powerState.displayStatus	Update	User	VM starting	VM running
properties.provisioningState	Update	System	Updating	Succeeded
Sun Jul 09 2023 14:02:20 GMT-0600 (Mountain Daylight Time)
properties.extended.instanceView.powerState.code	Update	User	PowerState/running	PowerState/starting
properties.extended.instanceView.powerState.displayStatus	Update	User	VM running	VM starting
Sun Jul 09 2023 14:00:10 GMT-0600 (Mountain Daylight Time)
properties.provisioningState	Update	System	Succeeded	Updating

risolis 8,741 Reputation points

2023-07-11T09:38:17.13+00:00

Many thanks for those details.

Let me review them and get back to you shortly.

Regards!
risolis 8,741 Reputation points

2023-07-11T19:04:56.36+00:00

Thank you for waiting.

I want to ask you if you have checked on your Azure subscription for any storage account and if there is any... Then, you can look for your data on a Blob Storage.

Looking forward to your reply.

Cheers!
risolis 8,741 Reputation points

2023-07-12T22:50:25.1666667+00:00

Hello @Jaspreet Hothi

I hope you are doing well.

I am wondering if you had any moment to review the last post made as well as if further details are required.

Looking forward to your reply.

Cheers!

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Lost data on attached disk

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