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Developer Conference - day 2

Lukáš Czerner had a one of the best talk here. Benefits of btrfs are a scalability more than 16EiB (ext4 can reach 16TB). It should be possible to do a very fast file system checking, incremental backups and snapshots. It should be easy add/remove drives or add subvolumes. The main deficiencies at the moment are: fsync (not fully functional), virtualization is quite slow and also encryption is not implemented. It sounds to me like not ready as default for Fedora, but it might be good choice in the future.
Later that day presented Edward "Joe" Thornber and Zdeněk Kabeláč Thin provisioning and snapshots in device mapper. Joe showed the theoretical part of thin provisioning and Kabi showed how does it work in few easy commands. Lvm commands are often seen as too complex and hard to use by an average user, but the howto showed it doesn't have to be true.

Bryn Reeves had his second talk - How to lose data and implicate people, which was the best talk from the whole conference.
He made a summary of common scenarios how to lose data. His presentation skills are awesome, so better look on the video, but the most funniest quotes were:
  • How long is an ohnosecond? Elapsed time between making a catastrophic error and realising what happened.  
  • Backups? We've heard of them...
Milan Brož had a talk about the disk encryption. He mentioned the benefits of a full disk encryption, where the key removal also means easy data disposal. Milan listed the possibilites of full disk encryption: hardware - encryption on disk controller (usb2sata on disk) - if the board broke, it's hard to save data. And the software encryption: truecrypt,  loop-AES with external store for key, bitlocker (proprietary, windows), luks/dm-crypt - based on a strict separation of the disk encryption engine (dm-crypt) and the key-management (LUKS).
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