Of course they are. It was obvious when they acquired FoundationDB that they were going to roll their Cloud service storage into their own design.
https://www.macrumors.com/2015/03/24/apple-acquires-foundationdb/
I think FoundationDB (as that precise product) is way too small for the sorts of scales Google (now) and Apple (eventually) operate at. Spanner (Google's "database") is not just cluster-sized but spans multiple clusters around the world (and uses bizarre ideas like atomic clocks plus GPS in each data center, to provide precise common time for all the machines in all the clusters).
Obviously one direction this goes is Apple creating its own cluster software to provide the sorts of massive file systems and DBs that these projects require. But another interesting direction/question is whether Apple CPUs/SoCs are used. Since the A6, I've suggested that it would make sense for Apple to create their own server SoCs, given how much Intel charges for their's. With the A9X Apple have performance parity with Intel (given that server CPUs run at 2.x GHz, not the 4GHz of high end desktop CPUs) and if Apple were willing to create the masks for an A9Z (or A10Z) with no GPU, no ISP etc, just 32 cores or so on a die, they could probably match Intel performance at a third of the power and a tenth of the price. Of course a server requires slightly more functionality than just the core, but there seems no reason Apple isn't up to designing that.
And testing out these sorts of designs inside their data centers is also a way to get to desktop Apple SoCs as more functionality is exercised (eg ethernet, SATA, USB3) that isn't present on iOS devices.
Which isn't to say that I'm predicting the return on an XServe. We MAY ultimately see that (if Apple feel they really can sell machines competitive with Intel at half the price) but maybe not ever. Apple's niche is people who are willing to pay more for the value of the Apple software and ecosystem, and servers don't match that. A more likely scenario, IMHO, would be the gradual rolling out of ever more developer services (free at small scale, paid for at larger scale) on the Apple cloud, like Apple versions of AWS and EC2, but giving higher performance and easier/more integrated APIs for developers. In other words -- you don't NEED to buy an XServe, you rent the capacity you need from Apple.
[doublepost=1458325947][/doublepost]
I though Apple already had its own cloud storage infrastructure. I thought that's what those facilities in middle of nowhere - the first in the US south east a few years ago, another near Reno, others (maybe one in Ireland (?)) - were for. What do I (obviously) miss, or misunderstand? Then, read yesterday Apple are moving away from Amazon toward Google to provide this. Now this article
(a) The whole point of things like AWS is to provide IMMEDIATE capacity for rapidly expanding companies (like Apple...), but in the expectation that, as they grow large enough they'll probably create their own facilities.
(b) These services provide more than just hardware; they provide control software to co-ordinate the interaction of these many machines. The simplest versions of this control software (the stuff circa 2005 or so) have, of course, been duplicated in open source projects like Hadoop (and likely within Apple), but the most recent stuff has not yet even been made public let alone duplicated. I expect that when you're operating at Apple levels, you have the option to pay for these services (eg massive database services) that are not visible in the public offerings from Amazon, MS, or Google. And until Apple has duplicated as much of that functionality as they need, they're going to continue renting it.
Remember there isn't one thing called "the cloud". There's lots of different types of data being stored (some accessed by many people simultaneously, some by just one person; some writable but much unwritable; some is large BLOBs, some is small fragments). Apple Maps has very different requirements from iCloud Drive which as different requirements from the iTunes store.
And that doesn't even get into the non-storage side of the cloud --- different distributed computation requirements. Right now Siri is Apple's most obvious cloud computation engine, but Apple is running their own web-crawler/indexer (apparently right now to provide Siri with data, but that could one day change...). And as AI becomes more pervasive, Apple will need distributed computation to provide translation services, image recognition services, etc -- the sort of things we expect from AI.
[doublepost=1458326162][/doublepost]
I never liked the idea of "the cloud" anyway. Just a lot of hype as it boils down to your stuff on someone else's hard drive. I had assumed they at least used Apple's OWN hard drives. Wrong!!! Amazon, MS, and Google!!!

GOOGLE???!!!

Oh for fsck's sake. You use the cloud every time you use Google, every time you use Siri, every time you check GMail.
The cloud is NOT just remote personal storage --- that is by far the least interesting and least important part of it.