IBM TS2340 User Guide - Page 387

AIX - Tape Utility Program (tapeutil) qrypos: This subcommand issues the STIOCQRYPOS ioctl command for the logical and physical tape positions and displays the data. In addition, the current tape position is saved and can be restored using a subsequent setpos subcommand. For example: # Append myfile.tar to the end of tape and then read back tapeutil -f/dev/rmt0.1 append \ qrypos \ write -s myfile.tar \ setpos \ read -d temp.tar # Verify myfile.tar was written correctly diff myfile.tar temp.tar read -d Destination [-c Count]: This subcommand reads a file, or a specified number of records, from the tape to the destination file name specified with the -d flag. If the optional count parameter is used, only the number of records specified with the -c flag are read unless a filemark is encountered before the number of specified records. If the count parameter is not used, all records up to the next filemark on tape are read. For example: # Restore myfile.tar from tape tapeutil -f/dev/rmt0 read -d myfile.tar # Read 3 records from the tape into myfile tapeutil -f/dev/rmt0 read -d myfile -c3 rewind and retension: These subcommands rewind the tape. rtest [-b Blocksize] [-c Count] [-r Repetition]: This subcommand performs a read test by reading a random data pattern from the tape and verifying that it matches the written data. The rtest subcommand can be used after the wtest subcommand to verify the data. An optional block size, count, and repetition can be specified with the -b, -c, and -r flags, respectively. If the block size is fixed, then the count specifies the number of blocks to read on each repetition. If the block size is zero (variable), then the count specifies the number of bytes to read on each repetition. The default is a block size of 10240, a count of 20 blocks, and a repetition of 1. For example: # R/W test using 256 KB blocks, 5 megabytes per write, 100 times tapeutil -f/dev/rmt0 rewind \ wtest -b 262144 -c 20 -r 100 \ rewind \ rtest -b 262144 -c 20 -r 100 rwtest [-b Blocksize] [-c Count] [-r Repetition]: This subcommand performs a read and write test by writing a random data pattern on the tape, reading it, and verifying that it matches the written data. An optional block size, count, and repetition can be specified with the -b, -c, and -r flags, respectively. If the block size is fixed, then the count specifies the number of blocks to write on each repetition. If the block size is zero (variable), then the count specifies the number of bytes to write on each repetition. The default is a block size of 10240, a count of 20 blocks, and a repetition of 1. For example: # R/W test using 256 KB blocks, 5 megabytes per write, 10 times tapeutil -f/dev/rmt0 rwtest -b 262144 -c 20 -r 10 sdp Number: This subcommand creates the specified Number of SDP partitions on tape. For example: Appendix D. Tape Utility Programs 369