evan@ssyx.ucsc.edu (Steven Grimm) (03/23/89)
SOME NOTES ON USING THE IBM3363 OPTICAL DISK SYSTEM We use an IBM ps2/30 that is dedicated to controlling an IBM 3363 WORM optical disk drive. The interface to the drive is the ftp program (ftp(1)). The ps2/30 is running in dedicated ftp server mode. The system is protected by password. The 3363 drive uses 200 megabyte removable cartridges. Each cartridge costs $25. New directories can be made only at the ps/2 console. Directories do not appear in ls or dir listings. You must know the name of the directory you want. The current working directory and drive persist across ftp sessions. Care should be taken to leave ftp with the current drive and directory "D:\". DOS filename restrictions are in effect: a file name can be as many as eight letters or numbers optionally followed by a dot optionally followed by as many as three letters or numbers. While the drive is "write once", the IBM disk driver maintains multiple versions when a file is "overwritten", and previous versions can be "promoted" from the console to be the current version. Similarly, while files can be marked as "deleted", previous versions remain, and there is an "eradicate" function available from the console that supposedly "really zeroes" a file. Here is an example of how to archive a an entire directory: 1. Arrange to have a directory made on the drive, and get an account name/password combination activated. 2. ftp ps230.ucsc.edu as follows: 1 % ftp ps230.ucsc.edu Connected to ps230.ucsc.edu. 220 PC Resident FTP server, ready 331 Password required 230 User logged in ftp> pwd 257 "D:\" is the current directory ftp> cd user 250 Chdir okay ftp> binary 200 Type set to I, binary transfer mode ftp> put "|tar cf - . | /usr/ucb/compress -v | crypt" 890306.tar 200 This space intentionally left blank < > Enter key:150 Opening connection Compression: 29.48% 226 Transfer complete local: |tar cf - . | /usr/ucb/compress -v | crypt remote: 890306.tar 4748015 bytes sent in 3.4e+02 seconds (14 Kbytes/s) ftp> get 890306.tar "|crypt | uncompress -v | tar tvf - > 890306.toc" 200 This space intentionally left blank < > 150 Opening connection Enter key: 226 Transfer complete local: |crypt | uncompress -v | tar tvf - > 890306.toc remote: 890306.tar 4748015 bytes received in 4.4e+02 seconds (11 Kbytes/s) ftp> ftp> cd .. 250 Chdir okay ftp> pwd 257 "D:\" is the current directory ftp> quit 221 Goodbye