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Image Caching

Image Caching

What is Image Storage?

To understand what image caching is and why it is beneficial, it is helpful to become familiar with how the model is extracted from a given basic image. When a new design is created on a computer, these common steps are performed by a computer administrator in consultation with the virt driver:

Download basic image from a glance

Copy or COW the base image to create a new root disk image, for example

Launch the example using a new root disk image

The first step involves downloading the entire base image to a local disk in a compute node, including several gigabytes of network traffic, storage, and several minutes of delay between starting the startup process and running that model. When the virt driver supports image saving, step # 1 above can be skipped if the base image is already in the compute node. This happens most often when it is sometimes applied to a node from the same base image recently. If available, the download function can be skipped, significantly reducing the start time of the second and subsequent status using the same image and avoiding uploading to the view and network connection server.

By default, the compute node will periodically scan the cached images, looking for basic images that are not used by any conditions other than the default lifetime (24 hours automatically). Those unused images are removed from the cache directory until they are needed again.