Wondering how to limit disk I/O and IOPS for KVM VPS? We can help you.

Here at Bobcares, we often handle requests from our customers to fix similar SolusVM queries.

Today we will see how our support engineers fix this for our customers as a part of our Server Management Services.

How to limit disk I/O and IOPS for KVM VPS?

Kernel-based Virtual Machine(KVM) is an open source virtualization technology built into Linux.

Specifically, KVM lets you turn Linux into a hypervisor that allows a host machine to run multiple, isolate virtual environments called guests or virtual machines (VMs).

KVM makes use of hardware virtualization to virtualize processor states, and memory management for the virtual machine is handle from within the kernel.

All hypervisors need some operating system-level components—such as a memory manager, process scheduler, input/output (I/O) stack, device drivers, security manager, a network stack, and more—to run VMs.

KVM has all these components because it’s part of the Linux kernel.

Every VM is implement as a regular Linux process, schedule by the standard Linux scheduler, with dedicated virtual hardware like a network card, graphics adapter, CPU(s), memory, and disks.

I/O in the current version is handled in user space, primarily through QEMU.

There is no such functionality that has implement in SolusVM.

As a workaround, Custom Config can use:

1. Firstly, login to SolusVM admin panel

2. Then, open SolusVM > Virtual Servers > {VPS} > Custom Config

3. Next, copy Live Config, paste it in Custom Config field and tick the checkbox Enable Custom Config:

4. Then, add the following part in <disk></disk> section:

<iotune>
<total_bytes_sec>10000000</total_bytes_sec>
<read_iops_sec>400000</read_iops_sec>
<write_iops_sec>100000</write_iops_sec>
</iotune>

For example:

set the values according to IO requirements

5. Finally, click Save and Reboot

[Need assistance with SolusVM queries? We can help you]

Conclusion

In short, we saw steps followed our Support Engineers to limit disk.