ftp does not go through as many transitions. Basically, there is an IP connection to a server which write directly to a file. The only encode/decode is if you do an ASCII translation. With TSO IND$FILE, you must encode and decode all your data into a 3270 data stream. Which, due to TSO, is half duplex (like the old walkie talkies, only one side talks at a time). You then IP connect your TN3270 emulator to a TN3270 server which encodes the 3270 data stream. Also, then IND$FILE transfer is limited to the size of your TSO screen. I.e. send one screen of encoded data (at most 80x24, or 1920, bytes for a -2; 27*132==3564 for a -5); wait and decode the response (protocol overhead); wash, rinse, repeat until all data is transferred. The protocol and data translation (if any) overhead on ftp is much less.
The above is just my SWAG based on some knowledge of how IND$FILE works internally. -- John McKown Systems Engineer IV IT Administrative Services Group HealthMarkets(r) 9151 Boulevard 26 * N. Richland Hills * TX 76010 (817) 255-3225 phone * [email protected] * www.HealthMarkets.com Confidentiality Notice: This e-mail message may contain confidential or proprietary information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. HealthMarkets(r) is the brand name for products underwritten and issued by the insurance subsidiaries of HealthMarkets, Inc. -The Chesapeake Life Insurance Company(r), Mid-West National Life Insurance Company of TennesseeSM and The MEGA Life and Health Insurance Company.SM > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] > On Behalf Of Tsai Laurence > Sent: Wednesday, September 19, 2012 6:35 AM > To: [email protected] > Subject: Why File transfer through TSO IND$FILE is slower than TCP/IP > FTP ? > > Dear listers , > as the subject, test file transfer through TSO IND$FILE & TCP/IP FTP , > and > found TSO IND$FILE is much slower than FTP. Any idea why ? > > > Regards, > Laurence > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
