High IOPS ( Response time ms ) inside the guest VM but not on the Host

Jashandeep Dhillon 1 Reputation point
2022-03-08T15:42:53.667+00:00

Hi Admins,

we have a complicated issue , can someone please shed some light if there is anything we may be missing to look into

we are seeing a very high disk response time inside all the guest VM's , this is a hyper-v environment with SAN attached disks - we assumed this would be a SAN issue but the response on the host is totally fine but not on the VM

It seems like something is limiting how the VM's are accessing the SAN disks , the integration services are up-to-date and not sure what else could be interfering with it

Any ideas

Hyper-V
Hyper-V
A Windows technology providing a hypervisor-based virtualization solution enabling customers to consolidate workloads onto a single server.
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  1. Limitless Technology 39,416 Reputation points
    2022-03-15T14:24:51.253+00:00

    Hi @Jashandeep Dhillon

    Thank you for your question and reaching out.

    1. Please monitor Network usage during high IOPS spike.
    2. Please make sure MPIO is installed on enabled on iSCSI connection.
    3. Please check inside the effected are they File server , SQL Database as they consume high disk I/O during Read/Write.
    4. I would strongly advise using Microsoft DiskSPD for benchmarking purposes
    5. Try to Disable VMQ of VM
    6. Check if your IDE or iSCSI controller added to the VM and try to make them iSCSI .

    Additionally its worth to have a look on below Microsoft article.

    https://learn.microsoft.com/en-us/windows-server/administration/performance-tuning/role/hyper-v-server/storage-io-performance

    Hope this answers your question :)
    Thank you.

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