The PowerCache is a hybrid HTTP content driven cache capable to store and serve Peta Bytes of data. The term “hybrid” means that it gathers the advantages of a standard Web cache and of an object cache. This is useful when a same object may be request by volatile or temporary URLs. It's main feature is to save bandwidth by serving repeatedly requested resources such as update files by serving them from the cache storage instead of downloading them each time.


A cache is far to be a simple storage system, it mainly is an HTTP proxy which handle cacheable objects while complying the HTTP protocol including its connection management specifications.

iZone PowerCache overview

Small HTTP objects Handling


Most of the time, multiple requests are issued using the same connection. Object cache sends the payload and then close the connection. This violates the HTTP connection handling and forces the browser to re-send the requests. In addition object cache does not handle the HTP revalidation mechanism as specified by the HTTP protocol standard and are not capable to handle small objects.


Dynamic Content Caching


When the content itself is dynamic, e.g. a banking web page, it obviously makes no sense to cache it. But many times, dynamic content refers to static content with dynamic or temporary URLs, that is, several URLs pointing to the same resource or object. This makes standard cache revalidation inefficient. The PetaCache embeds object cache capabilities names the “by content addressing” and is capable to retrieve objects by their content.


Small but efficient Cache


By default, the PowerCache runs on a single 256 G Bytes solid state disk (SSD). This is a quite small size for a cache. Since the cache is driven by a very accurate and highly performing cache policy, it succeeds to reach a 20% hit rate with a single 256G Bytes disk.


Huge Peta Bytes Cache


The hit rate of a cache is a logarithm function of its storage size. The PowerCache can thus handle extensible multi Tera-Bytes, up to one Peta Byte storage


Partial Content Caching


Update files, such as Windows updates are downloaded chunk by chunk using range requests and the famous 206 Partial Content HTTP reply. The PowerCache handle such request/responses and stores and serves partially downloaded objects.



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