Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!att!cbnewsl!clyde!feg
From: feg@clyde.ATT.COM (Forrest Gehrke,2C-119,7239,ATTBL)
Newsgroups: comp.binaries.ibm.pc.d
Subject: Warning--QC411-1 & QC411-2
Keywords: Bad actor in pipes.
Message-ID: <2955@cbnewsl.ATT.COM>
Date: 20 Nov 89 17:49:16 GMT
Sender: nntp@cbnewsl.ATT.COM
Reply-To: feg@clyde.ATT.COM
Distribution: na
Organization: AT&T Bell Laboratories
Lines: 20

I recently downloaded from SIMTEL20 the disk cache
program QC411-1 & QC411-2.  All went well during a
week of testing and I was very impressed with the
flexibility of the program for configurability and
for its enhancement of apparent disk transfer rate.

Then, during a pipe operation I found that either the
program does not properly flush its buffers or fails
to write through.  I was copying files from HD to
floppy with one of those programs which sense diskette
full and request a new diskette.  Much to my surprise
each subsequent diskette was nearly instantaneously
reported "full".  When I bailed out and investigated,
these subsequent diskettes were indeed "full".  They
had had the complete directory of files written, 
including sizes; however, it was the directory only.
No files were written on the subsequent diskettes, 
although the initial diskette was correctly written.

--Forrest Gehrke clyde!feg