Home > Blogs > VMware VROOM! Blog


High-Performance PVSCI Storage Adapter Can Reduce CPIO by 10%-30%

Paravirtualized SCSI (PVSCSI) is a high-performance storage
adapter available in VMware vSphere 4. The PVSCSI adapter is best-suited for
virtual machines that run applications which generate heavy I/O.

The vSphere 4 performance study compares the performance of
PVSCSI with LSI Logic for Fibre Channel and software iSCSI protocols. The
experiments show that PVSCSI greatly improves CPU efficiency and improves
throughput when the workload drives very high I/O rates. For Fibre Channel, the
test results show that PVSCSI
reduces the CPIO by 10%-30%
. For iSCSI, PVSCSI reduces the CPIO
by up to 25%.

Normalized
CPIO for Fibre Channel (lower is better)

Pvscsi_fc_normalized_cpio

To read the full study, go to http://www.vmware.com/pdf/vsp_4_pvscsi_perf.pdf.
To learn how to configure disks to use the PVSCSI adapter, see http://kb.vmware.com/kb/1010398.
For one workload exception where LSI Logic is better, see http://kb.vmware.com/kb/1017652.

One thought on “High-Performance PVSCI Storage Adapter Can Reduce CPIO by 10%-30%

  1. Duncan

    For those who don’t know, CPIO = Cycles Per I/O. In other words CPU requirements.

    Reply

Leave a Reply

Your email address will not be published. Required fields are marked *

*