IBM E16RMLL-I Implementation Guide - Page 516
caching side effects, create a file that is larger than the client memory, then FTP
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Chapter 15-5, "z/OS: FTP command without disk bottleneck" on page 486 shows an example of connecting to a z/OS system and switching to the *dev.null directory to avoid write I/O on the target system. The local file is being read from in this example. Example 15-5 z/OS: FTP command without disk bottleneck C:\>ftp Connected to . 220-FTPD1 IBM FTP CS V1R2 at , 15:44:09 on 2006-02-27. 220 Connection will close if idle for more than 5 minutes. User (:(none)): triple8 331 Send password please. Password: 230 TRIPLE8 is logged on. Working directory is "TRIPLE8.". ftp> cd *dev.null 250-Working Directory for PUT is NULL Device; 250 for GET is "TRIPLE8." name prefix. ftp> bin 200 Representation type is Image ftp> put TESTFILE.exe zz.exe 200 Port request OK. 125 Storing data in the Null directory (*dev.null). 250 Transfer completed successfully. ftp: 225904 bytes sent in 0.03Seconds 7530.13Kbytes/sec. ftp> quit 221 Quit command received. Goodbye. You can also use the FTP transfer statistics and compare those against the backup/restore numbers from a selective file backup and restore. When dealing with just a single large file, we will not see any database processing overhead but will collect comparable numbers for network throughput. To avoid any file caching side effects, create a file that is larger than the client memory, then FTP transfer the file from the server to the client and back. The preferred target directory is the directory where your server's disk storage pools are located. Doing the put/get will provide output similar to Example 15-6. Example 15-6 FTP statistics for the put transfer of a 500 MB file C:\>ftp banda.itsosj.sanjose.ibm.com Connected to banda.itsosj.sanjose.ibm.com. User (banda.itsosj.sanjose.ibm.com:(none)): maximilian 331-Password: 230-Last login: Fri Mar 3 11:02:27 PST 2006 on ftp from ::ffff:9.43.86.888 230-User maximilian logged in. ftp> put 500MBFile 200 PORT command successful. 486 IBM Tivoli Storage Manager Implementation Guide
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