On 5/2/20 19:28, Phil Karn wrote: > > Thanks for everyone's help, but listening to everyone else also talk > about taking weeks or months to delete a drive, with terrible > performance for other applications because of all the background I/O, it After sending this message I built and installed kernel version 5.6.10. Then I pulled the drive I was trying to remove and retried the 'device remove' command. To my surprise, it went much faster than before. Still not nearly as fast as the 'device replace' I ran on another drive, but it finished in about 12 hours. This was in rescue mode with nothing else running except sshd so I could watch remotely. I'm now running a full scrub; so far there hasn't been any damage. The remaining drives (two new 16TB and two old 6TB) are still very unbalanced. That's a job for another day, but I don't think I'll have the energy to remove any more drives from my array. I booted back to 4.19.0-8 because of some apparent incompatibilities between the 5.6.10 kernel and my Debian buster userland binaries and config files, but that probably has nothing to do with btrfs. Phil
