Why VMWare ESXi 5 slow down access to IBM M1015 / LSI 9240-8i RAID?

I build servers for virtualization and wanted to go with VMWare ESXi 5. I configured RAID10 on 4 discs attached to the IBM M1015 internal RAID controller (similar to LSI 9240-8i) and installed ESXi without any problem. Only problem is that copying data to the data store (on the RAID array) on the host is slow - about 20 MB/s. And I get about the same speed when you try to copy data to a shared folder on the guest virtual machine. The host network is auto-négociée with switch 1000Mbit 1000Full and I used vmxnet3 vm card in the guest computer.

When I install MS Hyper-V on the same exact server with the exact same table RAID10 I get around 110 MB/s speed to copy data to the Hyper-V host.

I used the latest drivers available for each system:

ESXi 5 - LSI_5_34-455140.zip\scsi-megaraid-sas-5.34-1vmw.500.0.0.406165.x86_64.vib

Windows - 5.2.112

I have even updated the firmware card 20.10.1 - 0077.

This card is entry level but recommended on different places for ESXi. What I am doing wrong? Am I missing something?

Thank you

As I mentioned earlier, ESXi does not have caching at the level of the BONE, unlike HyperV.

André

Tags: VMware

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