mark@bruce.oz (Mark Goodwin) (09/08/88)
Why oh why doesn't tar work? Is this a SR9.7 type "feature" or do I have to do something totally un-unix-like to /dev/rct8 so that tar can open it? "/com/edmtdesc /dev/rct8 -L" prints :- Volume information: DEV (device type) CT U (tape unit #) 0 LAB (labeled) no REO (reopen previously used volume) yes CLV (close volume on file-close) yes SPOS (save position on volume-close) no File information: F (file sequence #) current RF (record format) F (fixed length) BL (block length) 512 RL (record length) 512 ASCNL (ascii newline handling) no ------- Any help appreciated! Mark Goodwin.
GBOPOLY1@NUSVM.BITNET (fclim) (09/09/88)
sometimes the following works and sometimes it doesn't : [hopes this is fixed in sr10] first you need to log on or crp on or telnet onto the node that has the cart drive. then you must ensure that the tape is rewound. use "/com/rbak -dev ct -rewind". now try "tar -f /dev/rct8 ...." if the above doesn't work, i do log on node. (no need to rewind tape) /com/rwmt -dev ct -f 1 -rf f -unlab -r -raw -rl 512 -bl 512 file_1 tar -f file_1 ... if you have a few tarfiles on tape, then change -f 1 and file_1 to -f n and file_n respectively. another method is log on node and *rewind* tape dd if=/dev/rct8 | tar -f- .... i found out that i cannot make tar tapes at sr9.7. some guru told me that i have to use a blocking factor of 1 (slllooooowwwww). so i do the following: tar -cvbf 1 file_1 log on node. (no need to rewind tape) /com/rwmt -dev ct -f 1 -rf f -unlab -w -raw -rl 512 -bl 512 file_1 i also found out tapes make on non-apollo cart drives need not be done with a bf of 1 (could still use default of 20), but apollo cart drives must read and write at a bf of 1. i hope this helps. beaucomp of lucks. fclim --- gbopoly1 % nusvm.bitnet @ cunyvm.cuny.edu computer centre singapore polytechnic dover road singapore 0513.
rees@MAILGW.CC.UMICH.EDU (Jim Rees) (09/10/88)
Why oh why doesn't tar work? Is this a SR9.7 type "feature" or do I have to do something totally un-unix-like to /dev/rct8 so that tar can open it? You have to rewind the tape first, even if it's already rewound. Use "rbak -dev ct -rewind". One of the (relatively few) big disappointments of sr10 is that tape is still mostly broken, although you can now use "mt rew" to rewind. -------