On Mon, 2013-12-16 at 17:32 +0100, Hans-Kristian Bakke wrote:
> Ok, I guess the essence have been lost in the meta discussion.
> 
> Basically I get blocking for more than 120 seconds during these workloads:
> - defragmenting several large fragmentet files in succession (leaving
> time for btrfs to finish writing each file). This have *always*
> happened in my array, even when it just consisted of 4x4TB drives.
> or
> - rsyncing *to* the btrfs array from another internal array (rsync -a
> <source_on_ext4_mdadm_array> <dest_on_btrfs_raid10_array>)
> 

Ok, and do you have autodefrag enabled on the btrfs FS you are copying
to?  Also, how much ram do you have?

-chris

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