Is there a disk speed cap after 100 GB of copied data?

Peter Björklund 0 Reputation points

Is there some kind of speed cap when I copy data in Azure, if so how do I extend it? If there is no speed cap, why is it acting like this?


The source server have a 12 000 GiB Standard HDD LRS with 2000 Max IOPS and 500 Mbps thoughput. The source server isn't doing anything else at the moment than serving the file to the destination server.

Recource monitor of source server


The destination server have a 8192 GiB Premium SSD LRS with 16000 IOPS and 500 Mbps max throughput. The destination server is a development database server but is not under heavy load-

Recource monitor of destination server


With best regards, Peter Björklund

Windows Server
Windows Server
A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.
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  1. Limitless Technology 44,001 Reputation points


    Thank you for your question and reaching out. I can understand you are having query\issues related to Azure slow copy speed.

    You might see slow performance when you try to transfer files to the Azure Files service. If you don't have a specific minimum I/O size requirement, we recommend that you use 1 MiB as the I/O size for optimal performance.

    Use the right copy method:

    Use AzCopy for any transfer between two file shares.

    Use Robocopy between file shares on an on-premises computer.

    Reference :

    --If the reply is helpful, please Upvote and Accept as answer--

  2. Peter Björklund 0 Reputation points

    How do I set the IO size and how would that change the fact that I have 100MB/s in transfer speed during the first 100GB of data then it drops to 20MB/s? I figure that if the IO size was the issue I would experience the speed drop long before 100GB is transfered.

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