abcscnge@csuna.csun.edu (Scott "The Pseudo-Hacker" Neugroschl) (08/22/89)
Why can't I get tar(1) to work with the default devices? Config: Motorola Delta 3600 running System V/68 R3V5 (Motorola's V.3) Archive 2150S SCSI tape drive MVME141 CPU, MVME327 SCSI ctrlr Write Enabled DC600A tape ^^^^^ ^^^^^^^ TFM states that the default devices for tar(1) are (in order) /dev/mt/0m followd by /dev/mt0. I don't like having a raw device under /dev/mt, so I linked /dev/rmt/m327_40t to /dev/mt0. The problem? I can tar to /dev/rmt/m327_40t (tar cvf /dev/rmt/m327_40t files), I can even explicitly tar to /dev/mt0 ok (tar cvf /dev/mt0 files), I can tar FROM the default device ok (tar tv). What I CAN'T do is tar _TO_ the default device (tar cv files). When I try tarring to the default device I get: tar: cannot open /dev/mt/0m, No such file or directory tar: cannot open /dev/mt0, No such device or address Now. I can live with the first one, as /dev/mt/0m doesn't exist. But I cannot for the life of me figure out WHY I am getting the second error. I can read the device using it as the default. I can even WRITE the file using it as the explictly named tar device. WHY can't I write to it as the default tar device? And yes, my tape IS write enabled. In other words: $ tar tv --- tar listing $ tar xv --- files extracted $ tar cvf /dev/mt0 files --- tarchive created on /dev/mt0 $ tar cv files tar: cannot open /dev/mt/0m, No such file or directory tar: cannot open /dev/mt0, No such device or address aTdHvAaNnKcSe Scott Please send replies to ...!csun.edu!litvax!abctdev!scott or to abcscnge@csuna.csun.edu -- Scott "The Pseudo-Hacker" Neugroschl UUCP: ...!sm.unisys.com!csun!csuna.csun.edu!abcscnge -- Beat me, Whip me, make me code in Ada -- Disclaimers? We don't need no stinking disclaimers!!!
abcscnge@csuna.csun.edu (Scott "The Pseudo-Hacker" Neugroschl) (08/23/89)
Thank you to
Terry Laskodi <terryl%tekcrl.labs.tek.com@RELAY.CS.NET> and
root@phx.mcd.mot.com (0000-Admin(0000))
Both of whom came up with the same explanation. Tar apparently is
brain dead and tries to open the default device read/write.
I suspect that there is some problem with the permissions, and I will
check this tomorrow morning. Thanks guys.
Scott
--
Scott "The Pseudo-Hacker" Neugroschl
UUCP: ...!sm.unisys.com!csun!csuna.csun.edu!abcscnge
-- Beat me, Whip me, make me code in Ada
-- Disclaimers? We don't need no stinking disclaimers!!!