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Comparing to BusLogic and LSI Logic, Paravirtual SCSI (PVSCSI) controllers are high-performance storage controllers that can result in greater throughput and lower CPU utilization. It allows you to connect a large amount of storage to a virtual machine but it wasn’t designed to be as efficient as the PVSCSI or LSI Logic controllers and therefore should not be used with performance sensitive applications.When VMware released ESXi 4.0, they officially supported booting your OS drive from a paravirtual SCSI controller. This is a new storage controller available with vSphere 5.5 and virtual hardware 10.This configuration provides the capability to process more IO simultaneously and benefit from additional queues if necessary.
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To provide the best performance, one should also distribute virtual disk across as many vSCSI adapters as possible. It’s also worth noting that you can configure a total of 4 vSCSI adapters per virtual machine.How many vSCSI adapters are supported per virtual machine? While it does support that PVSCSI is more capable, keep in mind most customers are not producing 1 million IOPS so for real life the difference is negligible. Here’s a detailed whitepaper that takes a closer look at PVSCSI vs LSI Logic SAS for IOPS, Latency and Cost.Most modern operating systems that can drive high IO support one of these two controllers. This means that if you have a very storage IO intensive virtual machine, this is the controller to choose to ensure you save as many cpu cycles as possible that can then be used by the application or host. PVSCSI, however, is more efficient in the number of host compute cycles that are required to process the same number of IOPS. PVSCSI and LSI Logic Parallel/SAS are essentially the same when it comes to overall performance capability.
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In the past, there were issues if it was used with virtual machines that didn’t do a lot of IOPS, but that was resolved in vSphere 4.1.Īre there performance differences between them? VMware Paravirtual (aka PVSCSI) – this vSCSI controller is virtualization aware and was been designed to support very high throughput with minimal processing cost and is therefore the most efficient driver.It began to grown popularity when Microsoft required its use for MCSC within Windows 2008 or newer. LSI Logic SAS – This is an evolution of the parallel driver to support a new future facing standard.Most operating systems had a driver that supported a queue depth of 32 and it became a very common choice, if not the default. LSI Logic Parallel (formerly knows as just LSI Logic) – this was the other emulated vSCSI controller available originally in the VMware platform.While still available and used occasionally (Is anyone still running Win2K?), it should be considered legacy. It wasn’t however as performant as the LSI Logic driver since Windows’ driver was limited to a queue depth of 1, so often one would manually load the LSI Logic driver instead. The earliest versions of Windows has this driver available by default which made it easy when installing that particular OS. BusLogic – this was one of the first emulated vSCSI controllers available in the VMware platform.Let’s look at the options available today: So be sure to select the correct Guest OS to start in the right place.
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This automatically makes a selection for which vSCSI controller to use based on what drivers are available in the OS distribution. So what should I choose as my vSCSI controller and what are the differences between them?įirst, it’s important to remind everyone that when you select the Guest OS for a new virtual machine I wrote a blog article in Oct 2010 on this same topic that is still frequently referenced today so I figure it was due for an update.