K Star asked:
When we copy a file from sharing like a file of 200 mbs it takes 2 to 3 minutes to copy but it should take 2sec from a speed of 100mbps. Is there is any way to get full 100mbps speed? And why we don`t get the full speed?
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Just because the wiring is capable of doing 100mbps, that doesnt mean your system is!
Any file transfer only goes as fast as the slowest part.
Because all the different parts of a computer run at different speeds, you never actually get to use the full speed of a network connection.
The 100mb/s is mega bits – you need to divide it by 8 to get megabytes per second, also there are additional packets on the network for negotiation etc.
In addition you need to check if your network card is running in full duplex or simplex, this can slow the transfer.
If your in doubt set the card to auto negotiate so it sets the best speed, check any hub is set to this as well and so on – then check if everything is set to 100 full duplex, if not then something is not running at full speed but is only capable of simplex, this means that it will wait for something to send a packet before responding so the network will be sending data then getting an acknowledgement, send some more and so on.
when its in duplex mode the communication is two way at the same time so its quite a bit faster.
Well we are not in a perfect world.
Even though SCSI data transfer rates have progressed from the original 5 MB/sec to the current 160 MB/sec, protocol overhead times have not changed during that time. Today, with 160 MB/sec transfers and higher becoming much more common, a significant limitation has arisen: too much of the SCSI bus bandwidth is consumed by protocol overheads in these high-speed transfers. To address this limitation, Hitachi is starting to implement packetized SCSI technology as a way to improve data transfer in the Hitachi Ultrastar hard disk drive family of products.
Also the thing to keep in mind is the traffic on your lan.