DS411J - variable copy speed

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DS411J - variable copy speed

Unread post by sosei » Tue Mar 08, 2011 12:20 pm

I have bought a DS411j about a week ago, I have 4 WD HD's
http://www.wdc.com/global/products/spec ... language=1 in it in synology RAID5.
First thing I after install and volume format was upgrade to DSM 3.1

After playing around with the various parts of the NAS for a while (tried download station with some torrents,
put some pictures in to check the photostation, played some songs etc.) I started moving my HD ready .mkv
movie filesto the video folder last night, all went great at a speed of +/- 10 MB/s, which is normal for my network.

Today I started copying some TV shows (both .mkv and .avi) and initially all was fine at 10 MB/s but after
about an hour or so the copy speed is down to around 3 MB/s. After stopping and restarting the copy command
on my PC there was no improvement. Rebooting the NAS however seemed to fix it and I wrote it off as a glitch.

Now It's 1 hour later and I find myself in the same situation again. Tried another reboot this didn't get me back
to 10 MB/s like the last time, I googled around a bit and found that indexing on media files can cause degraded
performance, this however doesn't seem to be the case as CPU utilization never gets above around 10-15%.

Some other facts:
NAS isn't available from the internet
Dowload station is empty
No one else is doing anything on the NAS
As far as I can tell no indexing is being done (where should that show if it were ?)

Anyone got any suggestions ?

edit: speed seems to climb and fall for no apparent reason varying between 5 an 9 MB/s...

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Re: DS411J - variable copy speed

Unread post by sosei » Wed Mar 09, 2011 5:29 pm

Found the cause of the problem myself: the NAS is for some reason switching to half duplex when it's connected to my hub, hence the bad performance.

After some fiddling around I noticed something stange though. With the NAS connected directly on any port of the hub I get a half duplex connection.
However, if I connect the NAS to the ethernet port of my ZyXEL P-2602H-D1A ADSL modem, which in turn is connected to the afore mentioned hub, then all is fine and I get a full duplex connection.

Can someone enlighten me as to why this 'solution' works ?


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