Problem with write/read to/from the tape
Lakshmi Devi, on IDS 10.0 on RHEL 5.3, wrote a label to tape via /dev/nst0 in C, but reading it back printed nothing. Replies from Poonam Tandel, Keith Simmons and Obnoxio The Clown were jokes about old tape media. The label problem was not answered.
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Hi, I am using IDS 10.0 on RHEL 5.3 platform. I want to do some backup/restore and export/import operation with the database. I am writing a label to the tape as "BACKUP TAPE" or "EXPORT TAPE" during backup/export , so that i can check the same while doing restore/import. I used the below code to write to the tape: //checking the tape if ((fd = open("/dev/st0", O_RDONLY)) >= 0) { printf( "Tape open succeeded\\ "); close(fd); } //Rewinding the tape if( system("mt -f /dev/st0 rewind") != 0 ) { printf( "tape rewind failed\\ "); exit(0); } //Opening the tape in non-rewinding mode if ((fp = fopen("/dev/nst0","w")) == NULL) { printf( "tape open failed\\ "); exit(0); } //writing to tape if((fprintf(fp,"BACKUP TAPE\\ ")<=0) || (ferror(fp)!=0)) printf("write failed\\ "); fclose(fp); To read from the tape: I did the first 3 same operation as in writing and here the code follows if((fgets(cmd,sizeof(cmd)-1,fp)==NULL) || (ferror(fp)!=0) ) { printf("Reading from tape failed\\ "); } printf ("cmd is %s\\ ", cmd); --> prints nothing But write is getting passed without any errors. On the other side, read fails and cud nt read the label Can anyone help me out where i am going wrong? Should i go for tar/cpio to write even a string? -Lakshmi
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2009/2/24 POONAM TANDEL <poonam_tandel28@yahoo.co.in>: > > > ******************************************************************************* > Forum Note: Use "Reply" to post a response in the discussion forum. > > 8 track or cassette
Keith Simmons wrote: > 2009/2/24 POONAM TANDEL <poonam_tandel28@yahoo.co.in>: >> >> > ******************************************************************************* >> Forum Note: Use "Reply" to post a response in the discussion forum. >> >> > > 8 track or cassette What's wrong with a nice reel-to-reel? -- Cheers, Obnoxio The Clown http://obotheclown.blogspot.com -- This message has been scanned for viruses and dangerous content by OpenProtect(http://www.openprotect.com), and is believed to be clean.
2009/2/24 Obnoxio The Clown <obnoxio@serendipita.com>: > Keith Simmons wrote: >> 2009/2/24 POONAM TANDEL <poonam_tandel28@yahoo.co.in>: >>> >>> >> > ******************************************************************************* >>> Forum Note: Use "Reply" to post a response in the discussion forum. >>> >>> >> >> 8 track or cassette > > What's wrong with a nice reel-to-reel? > > -- > Cheers, > Obnoxio The Clown > > http://obotheclown.blogspot.com > > -- > This message has been scanned for viruses and > dangerous content by OpenProtect(http://www.openprotect.com), and is > believed to be clean. > > > ******************************************************************************* > Forum Note: Use "Reply" to post a response in the discussion forum. > > Aahhh !! George 3 and unlimited filestore (provided you could get the operators to load the tapes when needed), none of this foolish compression and tidying to recover disk space. Happy days :-)