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OLVM 4.5 Guest VMs lose 90% of IOPS compared to VMWare on the same storage and hardware

mdtaylorMay 16 2024

I am migrating EBS VMs from VMWare to KVM with 10g iSCSI connections to Pure Storage. Both VMware and OLVM hosts have dual NICS connected to Pure and iSCSI multipathing is enabled on the OLVM side. When I benchmark performance with the same guest vCPU/RAM and data, VMWare produces 115,000 IOPS and OLVM produces 10,000. Do I have to manually configure multipath on the OLVM hosts to get decent performance? I am already using dynamic hugepage allocation on the host and guests.

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Added on May 16 2024
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