Block IO Size

The disk attributes: BLOCKIOSIZE_LOGICAL and BLOCKIOSIZE_PHYSICAL are available options in a VM Template to improve performance for certain workloads, and both of these parameters must be defined for either to take effect.

An example of the context needed in the VM Template is seen below:

    DISK=[
        BLOCKIOSIZE_LOGICAL = "4096",
        BLOCKIOSIZE_PHYSICAL = "4096",
        IMAGE = "REGRESSION",
        IMAGE_UNAME = "admin" ]

• Logical Block IO Size - the logical block size the disk will report to the guest OS in the VM. Describes the smallest units for disk I/O.
• Physical Block IO Size - the physical block size the disk will report to the guest OS in the VM. Describes the hardware sector size used for alignment of disk data and partitions.

From the GUI, the VM Template can be updated to include this context by updating the Advanced options when attaching a disk as seen below: