Recovery of Raid0 with a faulty drive is a job for restore from backup, (or attempt to scrape what you can with array mounted ro).. That's what Raid0 *means*. I'm assuming that /dev/sda is the the drive you already identified as failing,, if not, you're totally hosed.
Yes -- /dev/sda is getting errors, it's failing. I didin't pass smart self-tests.
Thank you for inspection of my logs. I will try to pe patient until btrfs removes /dev/sda2 from array.
