On 6/26/20 11:15 AM, Matthew Miller wrote:
On Fri, Jun 26, 2020 at 11:13:39AM -0400, Josef Bacik wrote:
Not Fedora land, but Facebook installs it on all of our root
devices, so millions of machines.  We've done this for 5 years.
It's worked out very well. Thanks,

Josef, I'd love to hear your comments on any differences between that
situation and the typical laptop-user case for Fedora desktop systems.
Anything we should consider?

We buy worse hardware than a typical laptop user uses, at least for our hard drives. Also we hit our disks harder than most typical Fedora users. Consider the web tier for example, we push the entire website to every box in the web tier (measured in hundreds of thousands of machines) probably 6-10 times a day. This is roughly 40 gib of data, getting written to these truly terrible consumer grade flash drives (along with some spinning rust), 6-10 times a day. In addition to the normal sort of logging, package updates, etc that happen.

Also keep in mind we pay really close attention to burn rates for our drives, because obviously at our scale it translates to millions of dollars. Btrfs has improved our burn rates with the compression, as the write amplification goes drastically down, thus extending the life of the drives.

Obviously the Facebook scale, recoverability, and workload is going to be drastically different from a random Fedora user. But hardware wise we are pretty close, at least on the disk side. Thanks,

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