[Labs-l] Migrating all bots boxes to BTRFS

[Petr Bena]

Hi,

I suggest to switch to BTRFS filesystem on all /dev/vdb devices on all
boxes. I will start this experiment on bots-N (experimental) boxes for now.
And if there would be no troubles I would start switching it on all
production boxes as well.

BTRFS comes with tons of incredible features that none of existing linux
filesystems can do. And I would really like to perform maintenance on these
boxes without having to unmount its filesystem everytime when I need to
change it (BTRFS support basically everything you need to unmount regular
FS for ONLINE without any need to be unmounted, including defragmentation,
resizing, mirroring (on level of file, directory or subvolume), making
snaphots of files or directories and many more)
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