This directory contains two interface programs that can be used to interface
"vos dump" and "vos restore" with another backup system.

I found that Rx connections to the volserver would time out when stdout
from "vos dump" was blocked for a length of time.  I wrote a buffering
program, called dkbuffer, that would read a buffer periodically whenever
stdout was blocked for a length of time.  When stdout is unblocked, it
writes twice as much as it reads to clear the backlog.  (This program
functions like a cartoon hose.  When the end is stopped, it slowly expands.
When the end is releaseed, it sprays out the contents very quickly.)

I found that Rx connections to the volserver would time out when stdin
to "vos restore" was starved for a length of time.  I wrote a "trap door"
program that would wait for the data to become available before starting
"vos restore".  This solved the problem that we had of "vos restore" dying
before that start of data was found on the tape.

Usage:

vos dump ... | dkbuffer | write-data-into-backup-system ...

get-data-from-backup-system | dkwait vos restore ...


...Tim

          Tim Theisen           Associate Researcher
                                Department of Computer Sciences
Internet: tim@cs.wisc.edu       University of Wisconsin-Madison
   Phone: (608)262-0438         1210 West Dayton Street
     FAX: (608)262-9777         Madison, WI   53706-1685