Home SEO Google Makes use of Quicker Storage For Excessive Demand Pages

Google Makes use of Quicker Storage For Excessive Demand Pages


Google’s Gary Illyes reveals the search index makes use of a tiered system the place the preferred content material is listed on sooner, costlier storage.

This matter is mentioned within the newest episode of Google’s Search Off the Document podcast which offers with language complexities in search index choice.

In explaining how Google builds its search index, Illyes says content material is listed on three kinds of storage:

  • RAM (Random Entry Reminiscence): Quickest and costliest
  • SSD (Stable State Drive): Very quick however value prohibitive
  • HDD (Arduous Disk Drive): Slowest and least pricey

Google reserves the quickest storage for paperwork which are more likely to be served in search outcomes on a frequent foundation.


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Illyes states:

“After which, once we construct our index, and we use all these indicators that we now have. Let’s choose one, say, web page rank, then we attempt to estimate how a lot we’d serve these paperwork that we listed.

So will or not it’s like each second? Will we now have a question that triggers these docs? Or will or not it’s as soon as per week or will or not it’s every year?

And primarily based on that, we would use totally different sorts of storages to construct the index.”

Illyes goes on to provide examples of what could be saved on RAM, what could be saved on SSDs, and what could be saved on HDDs.

Content material that’s accessed each second will find yourself being saved on RAM or SSDs. This represents a small quantity of Google’s total index.


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The majority of Google’s index is saved on onerous drives as a result of, in Illyes’ phrases, onerous drives are low-cost, accessible, and simple to exchange.

“So for instance, for paperwork that we all know that is perhaps surfaced each second, for instance, they are going to find yourself on one thing tremendous quick. And the tremendous quick could be the RAM. Like a part of our serving index is on RAM.

Then we’ll have one other tier, for instance, for stable state drives as a result of they’re quick and never as costly as RAM. However nonetheless not– the majority of the index wouldn’t be on that.

The majority of the index could be on one thing that’s low-cost, accessible, simply replaceable, and doesn’t break the financial institution. And that might be onerous drives or floppy disks.”

After all Illyes is kidding about floppy disks, that’s the kind of dry humor you get from him on the podcast.

To my data that is the primary time Google has let the general public in on details about its search index storage tiers. It’s attention-grabbing to know probably the most searched-for content material is saved on RAM and SSDs.

The price of storing even a share of Google’s index on RAM and SSDs have to be exorbitant. Although it’s possible the price of sooner storage is justified by how vital the paperwork inside are to folks.

The demand for the content material have to be so excessive that Google doesn’t wish to threat a delay in getting it out to searchers.


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Because it pertains to web optimization there’s no approach to optimize for one sort of storage over the opposite. And there’s no approach to inform which of the storage tiers your website is listed on.

My guess is a decidedly small share of net pages are listed on RAM or SSDs. Bringing it again to web optimization, it is a  good factor because it means the vast majority of websites are competing on a degree taking part in discipline with regards to index storage velocity.