This is what I have in the system log file:
Jan 2 16:56:13 smartd[6711]: Device: /dev/sdk [SAT], 112 Currently unreadable (pending) sectors
Jan 2 16:56:15 kernel: BTRFS info (device sda): found 87 extents
Jan 2 16:56:17 systemd-logind: New session 9196 of user timecapsule.
Jan 2 16:56:17 afpd[37320]: Login by timecapsule (AFP3.4)
Jan 2 16:57:56 afpd[37320]: dsi_stream_read: len:0, unexpected EOF
Jan 2 16:57:56 afpd[37320]: dsi_disconnect: entering disconnected state
Jan 2 16:58:50 systemd-logind: New session 9197 of user timecapsule.
Jan 2 16:58:50 afpd[37467]: Login by timecapsule (AFP3.4)
Jan 2 16:59:57 afpd[37467]: dsi_stream_read: len:0, unexpected EOF
Jan 2 16:59:57 afpd[37467]: dsi_disconnect: entering disconnected state
Jan 2 17:01:59 kernel: BTRFS info (device sda): relocating block group 212272628367360 flags data|raid6
Jan 2 17:04:06 systemd-logind: New session 9200 of user timecapsule.
Jan 2 17:04:06 afpd[37814]: Login by timecapsule (AFP3.4)
Jan 2 17:05:07 systemd-logind: New session 9201 of user timecapsule.
Jan 2 17:05:07 afpd[37869]: Login by timecapsule (AFP3.4)
Jan 2 17:05:07 afpd[37869]: afp_disconnect: trying primary reconnect
Jan 2 17:05:07 afpd[12538]: Reconnect: transferring session to child[37814]
Jan 2 17:05:07 afpd[12538]: Reconnect: killing new session child[37869] after transfer
Jan 2 17:05:09 afpd[37869]: afp_disconnect: primary reconnect succeeded
Jan 2 17:05:09 systemd-logind: Removed session 9201.
Jan 2 17:05:57 afpd[37814]: afp_dsi_transfer_session: succesfull primary reconnect
Jan 2 17:06:58 systemd-logind: New session 9202 of user timecapsule.
Jan 2 17:06:58 afpd[37981]: Login by timecapsule (AFP3.4)
Jan 2 17:06:58 afpd[37981]: afp_disconnect: trying primary reconnect
Jan 2 17:06:58 afpd[12538]: Reconnect: transferring session to child[37814]
Jan 2 17:06:58 afpd[12538]: Reconnect: killing new session child[37981] after transfer
Jan 2 17:07:00 afpd[37981]: afp_disconnect: primary reconnect succeeded
Jan 2 17:07:00 systemd-logind: Removed session 9202.
Jan 2 17:07:54 afpd[37814]: afp_dsi_transfer_session: succesfull primary reconnect
Jan 2 17:08:55 systemd-logind: New session 9203 of user timecapsule.
Jan 2 17:08:55 afpd[38103]: Login by timecapsule (AFP3.4)
Jan 2 17:08:55 afpd[38103]: afp_disconnect: trying primary reconnect
Jan 2 17:08:55 afpd[12538]: Reconnect: transferring session to child[37814]
Jan 2 17:08:55 afpd[12538]: Reconnect: killing new session child[38103] after transfer
Jan 2 17:08:57 afpd[38103]: afp_disconnect: primary reconnect succeeded
Jan 2 17:08:57 systemd-logind: Removed session 9203.
Jan 2 17:09:51 afpd[37814]: afp_dsi_transfer_session: succesfull primary reconnect
Jan 2 17:10:51 systemd-logind: New session 9205 of user timecapsule.
Jan 2 17:10:51 afpd[38236]: Login by timecapsule (AFP3.4)
Jan 2 17:10:51 afpd[38236]: afp_disconnect: trying primary reconnect
Jan 2 17:10:51 afpd[12538]: Reconnect: transferring session to child[37814]
Jan 2 17:10:51 afpd[12538]: Reconnect: killing new session child[38236] after transfer
Jan 2 17:10:53 afpd[38236]: afp_disconnect: primary reconnect succeeded
Jan 2 17:10:53 systemd-logind: Removed session 9205.
Jan 2 17:11:46 kernel: NFSD: client 10.10.2.8 testing state ID with incorrect client ID
Jan 2 17:11:46 kernel: NFSD: client 10.10.2.8 testing state ID with incorrect client ID
Jan 2 17:11:46 kernel: NFSD: client 10.10.2.8 testing state ID with incorrect client ID
Jan 2 17:11:46 kernel: NFSD: client 10.10.2.8 testing state ID with incorrect client ID
Jan 2 17:11:49 afpd[37814]: afp_dsi_transfer_session: succesfull primary reconnect
Jan 2 17:12:49 systemd-logind: New session 9206 of user timecapsule.
Jan 2 17:12:49 afpd[38344]: Login by timecapsule (AFP3.4)
Jan 2 17:12:49 afpd[38344]: afp_disconnect: trying primary reconnect
Jan 2 17:12:49 afpd[12538]: Reconnect: transferring session to child[37814]
Jan 2 17:12:49 afpd[12538]: Reconnect: killing new session child[38344] after transfer
Jan 2 17:12:51 afpd[38344]: afp_disconnect: primary reconnect succeeded
Jan 2 17:12:51 systemd-logind: Removed session 9206.
Jan 2 17:13:58 afpd[37814]: afp_dsi_transfer_session: succesfull primary reconnect
Jan 2 17:13:58 afpd[37814]: dsi_stream_read: len:0, unexpected EOF
Jan 2 17:13:58 afpd[37814]: dsi_stream_read: len:0, unexpected EOF
Jan 2 17:13:58 afpd[37814]: dsi_disconnect: entering disconnected state
Jan 2 17:14:04 kernel: RPC request reserved 108 but used 268
Jan 2 17:14:23 systemd-logind: New session 9207 of user admin.
Jan 2 17:14:23 afpd[38430]: Login by admin (AFP3.4)
Jan 2 17:16:10 afpd[38430]: dsi_stream_read: len:0, unexpected EOF
Jan 2 17:16:10 afpd[38430]: dsi_disconnect: entering disconnected state
Yes, during the CPU high load I’m getting slowness for btrfs fi show.
If I physically unplug the HDD from the system, the btrfs know how to recover by itself? I mean that should be the basic functionality of raid6 just as a HDD crash
The delete tries to move everything from the drive to the others or what the process behind?