Re: mount btrfs takes 30 minutes, btrfs check runs out of memory

Hey Qu, all

On 07/15/2016 05:56 AM, Qu Wenruo wrote:

The good news is, we have patch to slightly speedup the mount, by
avoiding reading out unrelated tree blocks.

In our test environment, it takes 15% less time to mount a fs filled
with 16K files(2T used space).

https://patchwork.kernel.org/patch/9021421/

I have a 30TB RAID6 filesystem with compression on and I've seen mount
times of up to 20 minutes (!).

I don't want to sound unfair, but 15% improvement is good, but not in
the league where BTRFS needs to be.
Do I understand you comments correctly that further improvement would
result in a change of the on-disk format?



Thanks and with regards

Christian