Patch-ID# 100401-01
Keywords: front load tape, driver, SCSI host adapter, sm0, missing data, FLT
Synopsis: SunOS 4.1.1: front load tape doesn't reliably read tapes 
Date: 10-Oct-91
 
SunOS release: 4.1.1 
 
Unbundled Product: 
 
Unbundled Release: 
 
Topic: kernel/driver 
 
BugId's fixed with this patch: 1065300  

Architectures for which this patch is available: sun4

Patches which may conflict with this patch:

Obsoleted by: 4.1.2

Problem Description: 

    The front load tape drive doesn't reliably read tapes. 
    There are no console messages complaining about read errors, however the
    data is not always fully read.  When they experience the error, the tape
    blocks are shorter than they should be.  This problem is also intermittent,
    i.e., they often get different results if they read the tapes multiple times.

    This has been determined to be a problem with draining
    the dma gate array at the conclusion of a transfer.



INSTALL: 

As root:

mv /sys/sun4/OBJ/sm.o /sys/sun4/OBJ/sm.o.FCS
cp sun4/sm.o /sys/sun4/OBJ/sm.o

A new kernel will then have to be configured (/etc/config) and built.
Please refer to the System and Networking Administration Manual on building
and installing a custom kernel.