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- Path: sparky!uunet!gradient!ddj
- From: ddj@gradient.gradient.com (david johnson)
- Newsgroups: comp.sys.sun.hardware
- Subject: QIC24 drives slow on Sol_2.0, any fix?
- Summary: How to get tape drive to stream on write?
- Message-ID: <352@gradient.gradient.com>
- Date: 21 Jan 93 14:56:36 GMT
- Organization: Gradient Technologies Inc., Hudson MA
- Lines: 21
-
- I've had a Wangtek 5099ES tape drive (QIC36/QIC24 full height device
- with separate formatter card in the bottom and transport on top)
- attached to a sparc IPC, and it's been usable under SunOS 4.1.1.
- I added the entry to /usr/sys/scsi/targets/st_conf.c to recognize
- the drive and allow buffered data transfers. It streams on both
- reading and writing.
-
- On Solaris 2.0 (I have both bootable from the same disk drive), it
- streams on reading tapes, but is about 3x slower on writing. Each
- block written makes the tape move forward, back, and stop.
-
- The big question is where to modify the scsi or st driver so that
- it can keep this drive occupied? I've resorted to making my tape
- images on disk, switching back to SunOS and making the tapes from
- there.
-
- Thanks in advance for anyone who has figured this out already...
-
- Dave Johnson
- Gradient Technologies, Inc.
- ddj@gradient.com
-