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Issue with R7000 and USB HDD slowing it down

Jaxmoto

New Around Here
It is hard to search for this issue because the web is flooded with posts about external drives going to sleep, which is not my problem.

I have a stock R7000, running the latest firmware, set it up about a month ago. I am running a 5TB WD Elements external drive off the USB 3.0 port, works fine and wakes fine. It serves out media via readyshare DLNA and I have a Plex server running on a small server.

However, a few weeks back some friends got me into GTA Online, about the same time I swapped routers. I noticed there was some odd lag, lag that I normally do not get online. It would get better or worse, seemingly randomly.

Then last night I noticed it was horrible, that I was getting 3-5 seconds gaps in lag. I was also playing a movie on my HTPC via Plex, which would have been reading off the USB 5TB drive on the R7000 (About a 8GB MKV). So I turned off the movie and the lag vanished, worked perfectly. I can replicate the issue.

Everything is gigabit, QOS is off. My old router, a WNDR4700 with a internal 3TB drive never had this issue.

Has anyone else experienced this? I'm assuming it is some sort of stress on the CPU feeding USB 3.0 out and managing traffic, but I just can't see why it would cause so much chaos. (Oh, and I can't switch to DD-WRT because the drive is formatted NTFS).
 
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