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- Newsgroups: comp.unix.aux
- Path: sparky!uunet!ukma!nsisrv!jagubox!jim
- From: jim@jagubox.gsfc.nasa.gov (Jim Jagielski)
- Subject: 'tc'... Here it is!
- Message-ID: <1233@jagubox.gsfc.nasa.gov>
- Summary: "Official" release of new 'tc'
- Keywords: tape device driver
- Lines: 58
- Sender: usenet@nsisrv.gsfc.nasa.gov (Usenet)
- Nntp-Posting-Host: jagubox.gsfc.nasa.gov
- Reply-To: jim@jagubox.gsfc.nasa.gov (Jim Jagielski)
- Organization: NASA/Goddard Space Flight Center
- Date: Mon, 9 Nov 1992 18:20:24 GMT
-
- Well, I worked over the weekend and have completed the final touches
- to the new 'tc' tape device driver... It's no longer beta! This is
- the official one: version 3.00
-
- NOTES for Golden version of 'tc' (version 3.00).
-
- o 'mt' has been fixed... it didn't correctly report
- the "Generic" tape drive as such (it called it
- "Unknown").
- o In 'mt', 'eom' has been changed to 'eod'
- o Tracing has been changed... errors are always printed
- out. This makes much more sense as well as giving the
- user _some_ idea of what happened to 'tc'
- o During RESET or during Unit Attention, 'tc' will perform
- retries instead of just assuming EIO... (unless the
- sensecode is that the media's changed).
- o Tape drives report different numbers for Request Block
- Address... some have block 0 at BOT, others start with block
- 1. Also, most (all?) report the _next_ block in response
- to Req. Blck. Addr. not the current block (which is what
- 'tc' wants). This has been worked around... Still, 'mt'
- may report 1 as the physical block number at BOT for
- some untested drives. If so, please let me know and
- I can change this (which is arguably a picky point).
- (I know that Archives and WangDATs report the next
- block number and start at 0, so they should be Okay...
- I'm not so sure about the WangTEK or HP units... from
- what I have, it appears that they're the same but I
- haven't incorporated that into 'tc' yet.
- o Well, I've bitten the bullet. 'tc' can now read or write
- at the tape drive's own physical block size and not
- require 8k blocking. Doing so, which requires fiddling
- some minor device number bits and using mknod (see tc.1.Z),
- results in a big performance hit and isn't really
- recommended. Unless you really, _really_, REALLY need to
- do so, stay with the 8k blocking.
-
- I wish to thank all the beta testers as well as a great big thanks to
- Apple for helping me out.
-
- As always, comments, suggestions and experience are welcome.
-
- NEWtc.tar.Z is available here on jagubox via anon-ftp. As always, I
- can email it if need be.
-
- Enjoy.
-
- --
- Jim Jagielski | "It is not I who am crazy...
- jim@jagubox.gsfc.nasa.gov | it is I who am MAD!"
- NASA/GSFC, Code 734.4 |
- Greenbelt, MD 20771 | - Ren
-
- --
- Jim Jagielski | "It is not I who am crazy...
- jim@jagubox.gsfc.nasa.gov | it is I who am MAD!"
- NASA/GSFC, Code 734.4 |
- Greenbelt, MD 20771 | - Ren
-