Hi Xiao, Thanks for review. On Mon, 31 Jan 2022 16:29:27 +0800 Xiao Ni <xni@xxxxxxxxxx> wrote: > > + > > if (test_bit(In_sync, &rdev->flags) && !mddev->fail_last_dev > > && !enough(conf, rdev->raid_disk)) { > > The check of mddev->fail_last_dev should be removed here. Ohh, my bad. I mainly tested it on RAID1 and didn't notice it. Thanks! > > > - /* > > - * Don't fail the drive, just return an IO error. > > - */ > > It's the same. These comments can directly give people notes. raid10 > will return bio here with an error. Is it better to keep them here? Sure, let wait for Song opinion first and then I will send v4. Mariusz