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Just some problems/solutions storage

Category Archives: ASR

Azure: How to save drive letters during Azure Site Recovery (ASR)?

Update: Article is working for Classic ASR only. For Enhanced ASR Microsoft added the policy to the recovered machine automatically, so you do not need to tweak the policy in on-prem machine.

 

By setting the SAN policy to “OnlineAll,” you can make sure that the drive letter is maintained when the virtual machine starts to run in Azure (i.e. you will have Drive D: assigned to your drive and Azure scratch disk will be at the end).
To view the current SAN policy from the guest system, follow these steps:

  1. On the VM (not on the host server), open an elevated Command Prompt window.
  2. Type diskpart.
  3. Type SAN.

If the drive letter of the guest operating system is not maintained, this command returns either “Offline All” or “Offline Shared.”
To make sure that all disks are brought online and are both readable and writeable, set the SAN policy to OnlineAll. To do this, run the following command at the DISKPART prompt:

SAN POLICY=ONLINEALL

After you make this change, wait for the Copy Frequency (Recovery Point Objective) value to be configured to make sure that the changes are replicated to Azure. Then, run a test failover to verify whether the drive letters are preserved.

 

This Microsoft Article is gold!

 

Update: Article is working for Classic ASR only. For Enhanced ASR Microsoft added the policy to the recovered machine automatically, so you do not need to tweak the policy in on-prem machine.

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