Storage I/O Control (SIOC)
Before we define or discuss what SIOC control is, there are a few concepts that form the basics and also explain the need for a mechanism like SIOC.
ESXi runs a local host scheduler to balance the I/O between the virtual machines. This means that if there are virtual machines churning a considerable amount of I/O (more than normal), then it is important to make sure that the other virtual machines residing on the same datastore remain unaffected, in a manner that they should be allowed to issue I/O to the device. This is achieved by controlling the volume of I/O each of the participating virtual machines can issue, with the help of per-vmdk shares. This works pretty much like the CPU or Memory shares. The default virtual ...
Get Learning VMware vSphere now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
