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The Graveyard - Products No Longer Supported => D-Link Storage => DNS-323 => Topic started by: mgoyal212 on March 04, 2010, 06:24:46 AM

Title: Copying speed to DNS323 is decreasing
Post by: mgoyal212 on March 04, 2010, 06:24:46 AM

Hi Guys,

I just purchased DNS323 and have Gigabit network setup with PC with gigabit NIC card, DIR-655 router & DNS-323. I tested it by coping with 2GB file from PC to DNS323. The process starts with 19GByte/sec for 1 sec and then starts decreasing continuesly and slowly to 10GByte/sec.

Is this normal?  If not, what I can do to fix this problem?

Thanks,

Title: Re: Copying speed to DNS323 is decreasing
Post by: Tank_Killer on March 04, 2010, 06:29:08 AM

What you are experiencing is called "BURST TRANSFER RATE", yes this is normal.  It will also have varying degree's depending on your network topography.  My BURST transfer rate is about 3-4Mb/s different than my CONSTANT transfer rate.

Hope this helps

Title: Re: Copying speed to DNS323 is decreasing
Post by: gunrunnerjohn on March 04, 2010, 06:31:01 AM

The estimate always starts high and works down as a history is established.  The base speed will also be very dependent on the file sizes of the transfer, smaller files will be slower than larger files.

Title: Re: Copying speed to DNS323 is decreasing
Post by: mgoyal212 on March 04, 2010, 06:40:40 AM

Thanks Tank_killer & Gunrunnerjohn for your input.

Is 10MByte/sec is normal/good spead for 2GB file size?

Thanks,

Title: Re: Copying speed to DNS323 is decreasing
Post by: gunrunnerjohn on March 04, 2010, 06:47:59 AM

Actually, no. :)  You should be getting mid-teens if you have gigabit and are using jumbo frames.

Title: Re: Copying speed to DNS323 is decreasing
Post by: mgoyal212 on March 04, 2010, 07:38:51 AM

Then please guide me to get the mid-teen speed. I tried to test with Jumbo frames but my speed drastically decreased to 6MByte/S. I don’t know if my Dlink router DIR-655 supports jumbo frame also I don’t know how should I activate jumbo frame in my PC (Win7).  I have Intel 82566DC-2 Gigabit NIC on motherboard. 

Please guide me to activate jumbo frame in my router and PC, to attain the good speed.

Thanks,

Title: Re: Copying speed to DNS323 is decreasing
Post by: Tank_Killer on March 04, 2010, 07:59:13 AM

on a quick google search your router does NOT support jumbo frames as suspected.  I can reccomend a couple of things.  Connect your DNS right to your PC and setup a temporary static network (google is your freind), then try a transfer (2gb+ size).  If you acheive the same speeds then there might be an issue with your client PC (malware ect), or buy a decent switch that DOES support jumbo frames and put your PC and DNS on it.

Oh, and make sure your network cables are in good condition.

good luck

Title: Re: Copying speed to DNS323 is decreasing
Post by: mgoyal212 on March 04, 2010, 08:12:34 AM

Thanks tank_killer for your input. I will try as you said.