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I am curious to know what kind of setup services like Rackspace cloud, Slicehost, etc are running. If anyone is familiar with these types of offerings and has any insights please share.

Looking here, one could guess the hosts have 32-36gb RAM and 2tb RAID10 drives. Cat /proc/cpuinfo shows an Opteron 2350.

This suggests each host could be running upto 64x 512mb VPSs, 128x 256mb VPSs, 32x 1gb VPSs, and so on at max capacity. All on a cheap single quad core cpu.

Does this sound about right? Maybe a second, smaller RAID for shared swap etc?

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There are far too many variables to be able to answer this. The only people who can really tell would be Rackspace cloud, Slicehost etc – Iain♦ Jan 30 at 22:26
I'm not sure if this is an answerable question for SF (maybe more suited for Quora), but I was told by my Rackspace engineers that they re-purpose servers retired from their managed hosting operations for the cloud services. So they start with a set of reasonably standardized servers (say 3-4 models per generation) and re-configure the hardware to make them as uniform as possible. But there is undoubtedly some variation, and some smarts behind workload placement. Rackspace cloud does advertise persistent RAID-10 local storage (unlike Amazon, where local storage is ephemeral). – rmalayter Jan 30 at 22:42
Thanks rmalayter. Iain, you are right- only the insiders would know the exact answer- what I'm looking for are folks running similar offerings to share their experiences on averages, rules of thumb etc. VPS hosts are a dime a dozen- I thought there would be plenty on here who have insights but obviously not. – s29 Jan 30 at 22:56
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closed as not a real question by ErikA, Zoredache, Iain♦ Jan 30 at 22:23

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