Comments on: Can i get full 100mbps speed on lans for file sharing and transfers? http://www.victoriati.com/can-i-get-full-100mbps-speed-on-lans-for-file-sharing-and-transfers.html Talk about Communication over the Blog Sat, 25 Jun 2011 23:51:55 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: jamesmicoff http://www.victoriati.com/can-i-get-full-100mbps-speed-on-lans-for-file-sharing-and-transfers.html/comment-page-1#comment-795 jamesmicoff Tue, 20 Jan 2009 20:16:25 +0000 http://www.victoriati.com/can-i-get-full-100mbps-speed-on-lans-for-file-sharing-and-transfers.html#comment-795 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. 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.

]]> By: Answers R Us http://www.victoriati.com/can-i-get-full-100mbps-speed-on-lans-for-file-sharing-and-transfers.html/comment-page-1#comment-794 Answers R Us Mon, 19 Jan 2009 01:44:47 +0000 http://www.victoriati.com/can-i-get-full-100mbps-speed-on-lans-for-file-sharing-and-transfers.html#comment-794 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. 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.

]]> By: cajunspike1959 http://www.victoriati.com/can-i-get-full-100mbps-speed-on-lans-for-file-sharing-and-transfers.html/comment-page-1#comment-793 cajunspike1959 Sun, 18 Jan 2009 10:09:06 +0000 http://www.victoriati.com/can-i-get-full-100mbps-speed-on-lans-for-file-sharing-and-transfers.html#comment-793 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. 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.

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