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Allow more disks per core attached to VM

    Question

  • Hello,

    I'm quite sure I'm not the first who asks to allow more disks attached to VMs per core, though I can't find any related discussion here.

    I'm running A1 instance with 2 disks attached to the VM for awhile. My project needs to attach larger storage space (up to 10TB), while there is no need to increase computing and memory capacities for the VM.

    As I'm a paying customer already, I kindly ask you to waive the existing limitation on attaching disks per core as I don't want to waste the resources by upgrading the CPU/memory power of my VM and paying excessive fees for unused CPU/memory.

    Could you please assist me with that as contacting support didn't bring any result, but the template answer on available disks per core, etc.?

    Friday, September 25, 2015 7:59 AM

Answers

All replies

  • Hi,

    Actual Azure virtual machine configurations do not allow you to exceed the maximum data disks per VM size. This is not related to support. So even if you request that to support, they will tell you this is not supported. If you want to scale up the data disk count, you must scale up the VM size too. I know this is not always suitable but that is it, currently.

    The following link shows you the max data disk count per Azure VM size

    https://azure.microsoft.com/en-us/documentation/articles/virtual-machines-size-specs/

    You can add a request on the Azure feedback site, and urge the community to support you

    http://feedback.azure.com/forums/217298-storage


    Regards, Samir Farhat || Datacenter Consultant || The way to share my knowledge with the community Visit my blog : buildwindows.wordpress.com

    Friday, September 25, 2015 8:36 AM
  • Hi Samir,

    It seems as an artificial limitation, and yes, it needs support from the Azure users to waive this limitation.

    I just want to spend on those resources that I really need and use and don't want to be forced to pay excessive fees on extra-resources I never use.

    here is the topic and hope for support:

    http://feedback.azure.com/forums/217298-storage/suggestions/9919221-increase-the-number-of-attached-disks-per-core

    Friday, September 25, 2015 10:38 AM
  • Hi,

    In fact, that depends of how you are using your VM. You should be aware that storage transactions (read and writes) use CPU cycles. For example, in general with one core, you can't exceed a maximum throughput. But, in the Azure case, this is not applicable, because the maximum disk throughput (for  Standard Storage ) is 4 MB/s. With disk aggregation, you can go to up to 300 MB/s, a throughput which can be handled by a single core.

    So i support your idea!


    Regards, Samir Farhat || Datacenter Consultant || The way to share my knowledge with the community Visit my blog : buildwindows.wordpress.com

    Friday, September 25, 2015 10:56 AM