Google Makes use of Sooner Storage For Excessive Demand Pages

Google Uses Faster Storage For High Demand Pages

Google’s Gary Illyes reveals the search index makes use of a tiered system the place the most well-liked 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 forms of storage:

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

Google reserves the quickest storage for paperwork which are prone 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 alerts that we have now. Let’s choose one, say, web page rank, then we attempt to estimate how a lot we might serve these paperwork that we listed.

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

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

Illyes goes on to offer 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 arduous drives as a result of, in Illyes’ phrases, arduous drives are low cost, accessible, and straightforward to exchange.

“So for instance, for paperwork that we all know that could be 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 strong 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 arduous drives or floppy disks.”

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

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

The price of storing even a proportion of Google’s index on RAM and SSDs have to be exorbitant. Although it’s doubtless the price of sooner storage is justified by how essential the paperwork inside are to individuals.

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


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

My guess is a decidedly small proportion of net pages are listed on RAM or SSDs. Bringing it again to website positioning, this can be a  good factor because it means the vast majority of websites are competing on a stage taking part in discipline on the subject of index storage velocity.

supply : searchenginejournal

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