RaiserFS is dead as far as I&#x27;ve read.<p>btrfs is a shitshow - sorry to having to resort to such words but I will refrain from using it ever again if I have a choice.<p>If you look at the btrfs wiki there a lot of features but most of these are horrible broken or implemented in a way that&#x27;s surprising.<p>It&#x27;s full of bugs and not-yet-implemented stuff - some stuff that comes to mind:<p>* RAID is utterly broken: 
- <a href="http:&#x2F;&#x2F;www.spinics.net&#x2F;lists&#x2F;linux-btrfs&#x2F;msg48561.html" rel="nofollow">http:&#x2F;&#x2F;www.spinics.net&#x2F;lists&#x2F;linux-btrfs&#x2F;msg48561.html</a>  
- <a href="http:&#x2F;&#x2F;www.spinics.net&#x2F;lists&#x2F;linux-btrfs&#x2F;msg47845.html" rel="nofollow">http:&#x2F;&#x2F;www.spinics.net&#x2F;lists&#x2F;linux-btrfs&#x2F;msg47845.html</a><p>* Lot&#x27;s of ENOSPC bugs (just look at the mailing list)<p>* You need to run the latest kernel (don&#x27;t try anything below 4.2) 
- if not: Data corruption bugs, deadlocks<p>* Quota is utterly broken and continues to be breaking (just look at the mailinglist)<p>* It&#x27;s useless for databases or VM images (disabling datacow is a ugly hack IMHO) 
- e.g. see here: <a href="http:&#x2F;&#x2F;blog.pgaddict.com&#x2F;posts&#x2F;friends-dont-let-friends-use-btrfs-for-oltp" rel="nofollow">http:&#x2F;&#x2F;blog.pgaddict.com&#x2F;posts&#x2F;friends-dont-let-friends-use-...</a><p>ZFS is not perfect either especially on Linux it&#x27;s lacking tight integration into the VM subsystem and at least a few versions ago was prone to deadlocking, too. However it&#x27;s not eating data and compared to btrfs it&#x27;s rock solid.