Proposed F19 Feature: Fedora Upgrade - using yum

[Sam Varshavchik]

William Brown writes:

> In the future, hopefully once btrfs is a bit more mature, perhaps it
> could be considered to make a new writable snapshot subvolume of the
> system, and the use yum prefix to update the new subvolume. When you
> reboot, the new subvolume can become the new root.
>
> a) Currently running system files aren't affected.
> b) All upgrades are done online
> c) the update would merely be a switching of the root device on next
> reboot
> d) you could even roll-back by remounting the old root subvolume as the
> root fs.

Now, what's not clear to me – what exactly happens if, say, at the same  
time I'm browsing the web at the same time, watching videos. That generates  
write activity, changes to the disk, so what happens to all other disk  
activity while the upgrade takes place.

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