On Jan 24, 2014, at 7:52 AM, David Sterba <dste...@suse.cz> wrote:
> 
> The 'fill one device first" is addressed by
> "Btrfs: Add linear chunk allocation support"
> http://www.spinics.net/lists/linux-btrfs/msg29616.html


What about something like XFS's AGs? Instead of writing a single stream of 
files to just one disk until full, then going to the 2nd disk, then 3rd, etc. 
Why not write full files to all disks at the same time? That means file writes 
are always at single disk speed, but it means files can be written in parallel. 
For sequential writes it would be almost as fast as raid0 but without the 
ensuing data loss.


Chris Murphy

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