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#1 2009-01-31 02:36:09

RichTJ99
Member
Registered: 2009-01-09
Posts: 49

Why is it faster writing (upload at 20mbps) vs read (download at 10m)?

Hi,

Do I have my terms backwards?  Why is it faster for me to upload files to the DNS from my PC (19Mbytes per second) vs downloading from the DNS to my PC (reading)? 

I thought its faster to read a DNS than write to a DNS?

Thanks,
Rich

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#2 2009-01-31 04:06:07

fordem
Member
Registered: 2007-01-26
Posts: 1938

Re: Why is it faster writing (upload at 20mbps) vs read (download at 10m)?

The file transfer process goes something like this ...

Disk1<->disk_controller<->bus<->NIC1<->cable<->switch<->cable<->NIC2<->bus<->disk_controller<->Disk2

one of those two disks is in the DNS-323, along with all the other bits up to the NIC - the other disk and the other bits upto the NIC are in the other device you're transferring to/from.

You need to consider the entire chain shown when evaluating the transfer speed, it is generally quicker to reading from a disk than it is to write - but - when you're reading from one disk, you're writing to the other - so depending on the speed of the disks, how close to full they are and also the fragmentation level, you just might find that reading from your PC is a lot quicker than writing to it, which of course will mean that writing to your DNS-323, would also appear to be faster.

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#3 2009-01-31 22:10:15

cerk2006
Member
Registered: 2009-01-29
Posts: 11

Re: Why is it faster writing (upload at 20mbps) vs read (download at 10m)?

Hi,

I been playing around with transfer speeds to/from NAS and after tweaking both (PC & NAS) to 7kb jumbo frames I can report my findings:

HTTP transfer (after setting up a samba share on PC):
PC ---> NAS:  constant speeds 15-16MBps
NAS ----> PC: constant speeds 21-23MBps (total commander)
NAS ----> PC: constant speeds 31-33MBps (explorer)


FTP transfer (FileZilla):
PC ---> NAS: constant speeds 21-24MBps
NAS ----> PC: speeds around 12MBps, starting very high 20MBps gun then starts dropping and finishes around 12MBps; interesting is, that during a transfer a speed "hiccups" occur constantly – a transfer stops for a moment, then resums... ??

Uros

Last edited by cerk2006 (2009-02-01 15:08:18)

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#4 2009-01-31 22:58:07

RichTJ99
Member
Registered: 2009-01-09
Posts: 49

Re: Why is it faster writing (upload at 20mbps) vs read (download at 10m)?

Hrmm, I also do my transfer tests through FTP. 

How did you measure your HTTP test transfers  speeds?

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#5 2009-01-31 23:58:50

cerk2006
Member
Registered: 2009-01-29
Posts: 11

Re: Why is it faster writing (upload at 20mbps) vs read (download at 10m)?

RichTJ99 wrote:

Hrmm, I also do my transfer tests through FTP. 

How did you measure your HTTP test transfers  speeds?

total commander or explorer

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#6 2009-02-01 03:23:57

RichTJ99
Member
Registered: 2009-01-09
Posts: 49

Re: Why is it faster writing (upload at 20mbps) vs read (download at 10m)?

Im confused, when using windows explorer, how do you see the transfer rate when dragging & dropping files.

Unless your talking about viewing your files on the 323 as a web page (how is that done)?

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#7 2009-02-01 11:09:08

cerk2006
Member
Registered: 2009-01-29
Posts: 11

Re: Why is it faster writing (upload at 20mbps) vs read (download at 10m)?

total commander


Attachments:
Attachment Icon copy1.jpg, Size: 25,827 bytes, Downloads: 139

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#8 2009-02-01 11:10:47

cerk2006
Member
Registered: 2009-01-29
Posts: 11

Re: Why is it faster writing (upload at 20mbps) vs read (download at 10m)?

win vista

Last edited by cerk2006 (2009-02-01 11:14:34)


Attachments:
Attachment Icon copy2.jpg, Size: 28,713 bytes, Downloads: 122

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#9 2009-02-01 17:32:24

RichTJ99
Member
Registered: 2009-01-09
Posts: 49

Re: Why is it faster writing (upload at 20mbps) vs read (download at 10m)?

Thanks!  Thats pretty cool.  Is a file transfer like that considered a HTTP transfer?

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#10 2009-02-01 20:53:20

cerk2006
Member
Registered: 2009-01-29
Posts: 11

Re: Why is it faster writing (upload at 20mbps) vs read (download at 10m)?

RichTJ99 wrote:

Thanks!  Thats pretty cool.  Is a file transfer like that considered a HTTP transfer?

See above, I edited my first post... wink

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