On Thu, 30 Mar 2006 20:29:15 -0500, John S. Giltner, Jr. <[EMAIL PROTECTED]> wrote:
> From my experience SMB on any platform is slow. Think about it, a 200K >file loading in 5-9 seconds in the office. That is a transfer rate of >somewhere between 20 to 40 K a second. Now add the overhead of a VPN >and the latency and through put of something that is most likely much >less than the network between your PC and the mainframe at your work. > >What is the slowest network connection in your office? >What is the speed of the network that your VPN is transversing? > >What do you mean pulling it directly? FTP? FTP is much more efficient >that SMB. > >SMB is real chatty. IIRC it does one ACK for every two data packets and >the ACK is not sent until the data packets are received. This is on top >of the TCP level ACK's. > I had a presentation by cisco people about their VPN accelerator ,their AVS ( appl velocity system) their WAFS ( wan accelerator for file system) and WAE ( wan accelerator engine) , Obviously WAFS has been invented for the exact problem you are facing . The chat to open a document with word or excell over a network . The number they showed me was like 1000 exchanges to open and close a file and they were dividing this by 8 or 10 , by letting only the security portion of the handshaking flow ( enqueue etc .. ) and by simulating a big part of this handshaking on both ends to reduce the chatyness , and trying to let flow the data only . The improvement is just tremendous . try to find out on google how this WAFS , WAE and cisco accelerator work and it will give you some good insight in what John is describing exactly . Bruno Bruno(dot)sugliani(at)groupemornay(dot)asso(dot)fr ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
