07/30/87 disk_queue

Syntax as a command: disk_queue {subsystem_name} {-control_args}


Function: prints the entries from the disk read/write queue for some
          or all disk subsystems.


Arguments:
subsystem_name
   is the name of a particular disk subsystem to print the queue for.
   If none is specified, the queues for all configured disk subsystems
   are printed.


Control arguments:
-long, -lg
   print the long form of the information; the extra information
   printed in this format is the time of the I/O request, the
   cylinder address and the physical volume name of the drive.
-brief, -bf
   print the normal (short) form of the information. (DEFAULT)
-all, -a
   print all queue entries, both from the live queue and the processed
   queue.
-live
   print only the live queue entries; those for which the requested I/O
   has not yet been completed. (DEFAULT)


-last N, -lt N
   print the last (most recent) N entries from the queue of already
   processed requests. To print all available processed queue entries,
   any large value for N (such 100000) may be specified.
-erf N
   print the disk queue from the FDUMP for ERF NNN.
-online
   print the online disk queue. (DEFAULT)
-read
   print information only for read requests. The default is to print
   information for both read and write requests.
-write
   print information only for write requests.


-record, -rec, -page, -pg
   print information only for page (record) I/O requests. The default
   is to print information for both page and VTOC I/O.
-sector, -sec, -vtoc
   print information only for VTOC (sector) I/O requests.


Notes:
   The drive name of the disk drive is printed for both -long and
   -brief output formats.  In -long format the physical volume name is
   also printed.  Due to synchronization between queuing and
   processing of requests and ring 0 peeking disk_queue will
   frequently list requests which are not for the subsystem of
   interest and/or have already been processed.  If requests have
   already been processed, and the used bit is off in the entry, the
   queue chaining ceases for that drive and an informative message is
   printed.  Queue chaining for other drives continues.


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Historical Background

This edition of the Multics software materials and documentation is provided and donated
to Massachusetts Institute of Technology by Group BULL including BULL HN Information Systems Inc. 
as a contribution to computer science knowledge.  
This donation is made also to give evidence of the common contributions of Massachusetts Institute of Technology,
Bell Laboratories, General Electric, Honeywell Information Systems Inc., Honeywell BULL Inc., Groupe BULL
and BULL HN Information Systems Inc. to the development of this operating system. 
Multics development was initiated by Massachusetts Institute of Technology Project MAC (1963-1970),
renamed the MIT Laboratory for Computer Science and Artificial Intelligence in the mid 1970s, under the leadership
of Professor Fernando Jose Corbato. Users consider that Multics provided the best software architecture 
for managing computer hardware properly and for executing programs. Many subsequent operating systems 
incorporated Multics principles.
Multics was distributed in 1975 to 2000 by Group Bull in Europe , and in the U.S. by Bull HN Information Systems Inc., 
as successor in interest by change in name only to Honeywell Bull Inc. and Honeywell Information Systems Inc. .

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Permission to use, copy, modify, and distribute these programs and their documentation for any purpose and without
fee is hereby granted,provided that the below copyright notice and historical background appear in all copies
and that both the copyright notice and historical background and this permission notice appear in supporting
documentation, and that the names of MIT, HIS, BULL or BULL HN not be used in advertising or publicity pertaining
to distribution of the programs without specific prior written permission.
    Copyright 1972 by Massachusetts Institute of Technology and Honeywell Information Systems Inc.
    Copyright 2006 by BULL HN Information Systems Inc.
    Copyright 2006 by Bull SAS
    All Rights Reserved