Re: BTRFS Mount Delay Time Graph

2018-12-04 Thread Wilson, Ellis
On 12/4/18 8:07 AM, Nikolay Borisov wrote: > On 3.12.18 г. 20:20 ч., Wilson, Ellis wrote: >> With 14TB drives available today, it doesn't take more than a handful of >> drives to result in a filesystem that takes around a minute to mount. >> As a result of this, I sus

BTRFS Mount Delay Time Graph

2018-12-03 Thread Wilson, Ellis
Hi all, Many months ago I promised to graph how long it took to mount a BTRFS filesystem as it grows. I finally had (made) time for this, and the attached is the result of my testing. The image is a fairly self-explanatory graph, and the raw data is also attached in comma-delimited format

Re: Understanding BTRFS RAID0 Performance

2018-10-05 Thread Wilson, Ellis
On 10/05/2018 06:40 AM, Duncan wrote: > Wilson, Ellis posted on Thu, 04 Oct 2018 21:33:29 + as excerpted: > >> Hi all, >> >> I'm attempting to understand a roughly 30% degradation in BTRFS RAID0 >> for large read I/Os across six disks compared with ext4 atop mdad

Understanding BTRFS RAID0 Performance

2018-10-04 Thread Wilson, Ellis
Hi all, I'm attempting to understand a roughly 30% degradation in BTRFS RAID0 for large read I/Os across six disks compared with ext4 atop mdadm RAID0. Specifically, I achieve performance parity with BTRFS in terms of single-threaded write and read, and multi-threaded write, but poor