Re: Ontape and named pipes

Rick Ward wrote: > > Spencer, Bill wrote: > > > > Hi there, > > I am trying to utilise named pipes with the ontape utility to provide > > fast disk backup and restore with compression/uncompression 'on the fly'. > > > > The backup script works fine, however i am wondering how > > to implement the restore part . > > The ontape utility works fine when reading a disk file > > but what do you do when reading from a named pipe. > > > > Any suggestions would be helpful, even if it is to say > > it can;t be done. > > > > Bill Spencer. > > I have experimented with this also, to save disk space when archiving. In order to restore the > archive from a compressed file through a named pipe to into ontape, I did the following: > > (uncompress -cf arcfile > pipefile;uncompress -cf arcfile > pipefile) & > ontape -r <<h &> > y > n > n > n > h > > This is a rather crude way of restoring, but it worked for me, BUT ONLY FOR LEVEL 0 restores. I > never managed to get Level 1 or 2 restores working in an automated manner. > > The y n n n are replies to the questions: > Continue ? > Backup logical logs ? > Restore Level 1 ? > Restore Logs ? > > Obviously change these if you have different requirements. > > The double uncompress is required because (I think) ontape "rewinds" the tape and reads the archive > information first to display to you followed by the message "Continue ?". It then closes the file > which breaks the named pipe. The second uncompress then satisfies your reply "Y". > > This all worked for V7.12, but if you have any queries you can e-mail me direct (wardr@gusco.com). > > Good luck. > -- > Rick Ward > Senior DBA > Great Universal Stores Home Shopping > MANCHESTER, UK Not in the HEART of this problem, but : use gzip, it shrinks the files much better than compress.... (sorry for bothering you...) -- Valery Fouques valou@hotmail.com SYSADM GOSPORT-FRANCE /\\oO/\\ _ __/| \\`O.o' "355/113 -- Not the famous irrational =(_ _)= number PI, but an incredible simulation!" U