Let’s us try to attempt to answer some of the above questions:ġ) What Should be the ideal size of an ASM Disk?
More information on how to set the queue depths to maximum for workloads with intensive I/O patterns can be found in the article KB 2053145.
Use all 4 PVSCSI controllers whenever and wherever possible.
So, simply using PVSCSI controllers will not help, the queue depth for the PVSCSI controller and the vmdk’s attached to that PVSCSI controller should be set to maximize. One of my earliest blogs ‘ Queues, Queues and more Queues’ in 2015 attempts to explain the importance of queue depth especially in a virtualized stack. Much has been written and spoken about Queue depth’s, both on the PVSCSI side and the VMDK side. More information on SCSI, SATA, and NVMe Storage Controller Conditions, Limitations, and Compatibility’ can be found here. More information on VMware Paravirtual SCSI adapter can be found here. VMware Paravirtual SCSI controllers are best suited for environments running I/O-intensive applications. VMware Paravirtual SCSI adapter is a high-performance storage controller which provides greater throughput and lower CPU use.
Remember, any performance data is a result of the combination of hardware configuration, software configuration, test methodology, test tool, and workload profile used in the testing.