[TWC] SB6141 upload traffic hogged by ReadyNAS Duo
After replacing my Arris leased modem with the SB6141, when my NAS starts its cloud backup to Amazon S3 storage (using s3cmd), no other device can access the internet. I'm pretty sure it's because the upload is taking all the bandwidth and the other devices are timing out trying to get through. Some web page loads do eventually get through, but most will not.
Sadly, the router is an Airport Extreme which has no QoS settings. The job is actually started via crontab so I can make sure it is only running late nights, but that makes large backups take weeks instead of days.
The real question is why this didn't happen with the Arris and is there some setting I'm missing?
North Tonawanda, NY
·Verizon Online DSL
My guess without going into any detail what so ever would be due to the way QoS is handled in each modem on the upstream. If the NAS is consuming your full upload rate, it could be preventing all other data from being responded to in a timely manner. A ping test with a 20 second timeout should prove this. I've seen similar behavior happen with my DSL connection when the device doing the uploading is putting too much data in an upload queue to actually be sent out. Shoots the latency right up.
The NAS hopefully will have some sort of upload rate limiting so you can shave off about 20-30KB/s off of the rate to allow for room for other applications.
Now, unless there's something else going on with the Motorola, but I'm not well versed in how they are setup and what can be done to potentially fix this. On some modems, slow speeds or troubles have sometimes been resolved by shutting off the firewall in the modem if it's a router. 6141 is just a modem to my knowledge and at which point should be just in a passthrough state.
Thanks Smith - you may be on to something. The Arris was a TM502G Telephony Modem which must have QoS built in for the Telephony part. The SB6141 is just a straight up modem with no reason for QoS.
The NAS has no rate limiting (and I wouldn't want to limit I/O from the NAS, only internet traffic). I use s3cmd to talk to Amazon S3 and it has no option for rate limiting like rsync does (that's where the solution really belongs).
There is a bandwidth shaper called trickle that I may try to install on the NAS. Or I can just let the cron job run from 1130p-5a or so. Of course it was nice to let the job use the full bandwidth when there was no other traffic.