Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!ames!sgi!jeremy@denali.SGI.COM From: jeremy@denali.SGI.COM (Jeremy Higdon) Newsgroups: comp.sys.sgi Subject: Re: tar Summary: appending to a 1/4 inch cartridge tape Message-ID: <29275@sgi.SGI.COM> Date: 23 Mar 89 19:59:49 GMT References: <8903230213.aa10762@SMOKE.BRL.MIL> Sender: daemon@sgi.SGI.COM Organization: Silicon Graphics, Inc., Mountain View, CA Lines: 18 You should be able to append to a 1/4 inch cartridge tape by doing: mt feom tar cf /dev/nrtape mt feom positions you at end of data. tar to /dev/nrtape causes tar not to rewind the tape at the beginning. One little speed hint for 4D's is that if you are backing up large files, you may actually get better speed if you use a buffer of about 8k. This is because the 60MB cartridge tape has an internal 16k buffer, so you get double buffering. The standard tar buffer size is 200k, which is good for typical files. Be sure you read a tape back with the same blocksize it was written with. Jeremy Higdon