On Thu, 2020-07-09 at 13:32 -0700, Davide Cavalca via devel wrote:
> On Thu, 2020-07-09 at 16:15 -0400, Simo Sorce wrote:
> > However I have had bad kernels, power outages, loss of battery power
> > (laptops on too long suspend) and other random reasons to force
> > reboot
> > a system. That has been the primary case of file system checks
> > through
> > my Fedora usage. And luckily so far I never had a loss of filesystem
> > or
> > data that way, fsck always ended up solving most of the issues, and
> > whenever I lost file they ended up being temporary files I did not
> > care
> > for.
> > 
> > I do not think those failures are common in Facebook fleets, so I am
> > quite skeptical FB data and failure modes are representative of
> > Fedora
> > usage as a desktop/laptop OS and therefore of the behavior of btrfs
> > in
> > those cases.
> As someone on one of the teams at FB that has to deal with that, I can
> assure you all the scenarios you listed can and do happen, and they
> happen a lot. While we don't have the "laptop's out of battery" issue
> on the production side, we have plenty of power events and unplanned
> maintenances that can and will hit live machines and cut power off.
> Force reboots (triggered by either humans or automation) are also not
> at all uncommon. Rebuilding machines from scratch isn't free, even with
> all the automation and stuff we have, so if power loss or reboot events
> on machines using btrfs caused widespread corruption or other issues
> I'm confident we'd have found that out pretty early on.

Oh this is really good to know, it is more reassuring!


Simo Sorce
RHEL Crypto Team
Red Hat, Inc

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