HDDs slow down after a few hours
I recently set up my rock64 4GB with debian 9 as a media box.

I installed plex and rtorrent and everything is going smoothly. The only problem I have is that after a few hours (probably 6/7 hours) of "work" both my HDDs (one on USB 3.0 the other on the 2.0) slow down from 70-90MB/s to 6-7MB/s. The speed drop happens with all the programs: samba, ftp, rtorrent etc.

The only way to get performance up again is to remount both drives. At that point I get 70-90MB/s back.

My fstab:
LABEL=boot /boot/efi vfat defaults,sync 0 0

LABEL=Media2 /home/rock64/torrents/rtorrent/Media2 ext4 defaults,noatime 0 0

LABEL=Media3 /home/rock64/torrents/rtorrent/Media3 ext4 defaults,noatime 0 0
Disable rtorrent and see if that makes a difference. I'm assuming your HDDs are powered independently of the board so assuming you have the correct power supply I doubt lack of power is an issue. Have you tried each HDD separately to see if that cures the problem. Try running Top or Htop to see if it can identify any performance issues.

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