carey@uiucdcsm.cs.uiuc.edu (06/27/88)
Does anyone know if a tape written with volcopy on a 3B20 can be read by a 3B15? (with volcopy or anything else) I tried volcopy but couldn't come up with the right combination to read the tape. Any help would be appreciated. --John Carey carey@a.cs.uiuc.edu carey@uiucdcs.UUCP
wcs@skep2.ATT.COM (Bill.Stewart.<ho95c>) (07/01/88)
In article <7600010@uiucdcsm> carey@uiucdcsm.cs.uiuc.edu writes: > Does anyone know if a tape written with volcopy on a 3B20 can be > read by a 3B15? (with volcopy or anything else) Remember that a volcopy is a physical copy of the blocks in your filesystem (basically "dd"). This means it will only be readable if - your tape drive can handle the blocksize (some of the older tape drives for the 3B5/3B15 couldn't handle reading large blocks.) - it fits on the disk slice on the target machine (if the tape is smaller than the disk, you waste space but it works ok.) - you're running operating systems with compatible file system types - I think the 3B20 uses blocks of 512 or 1024, and the 3B15 uses 512 or 2048 - if the 3B20 tape has 1024-size blocks you may be out of luck. Check out the superblock headers and fs manual page. -- # Thanks; # Bill Stewart, AT&T Bell Labs 2G218, Holmdel NJ 1-201-949-0705 ihnp4!ho95c!wcs Rnmail: .signature too boring - deleted