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    Types: HLP, TextFile
    Names: »IOX.HLP«

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TextFile

IOX

IOX is a DFS based I/O exerciser.  It is a combination of the DFS
based tape exerciser, TAPEX, and the DFS based disk exerciser,
DISKX.  The IOX program may only be run on Series 200 processors
due to memory constraints.  To invoke the IOX program type:

    CLI> x iox

The exerciser will prompt you as follows:

    Simulate packet requests [Y] ?

Answering "Y" to this question causes IOX to use the same entry points
to the I/O Processor Kernel as the R1000 would use during system
operation.  It provides for more extensive testing of system integerity,
allows more parallelism, and increases I/O throughput.

    Exercise Tapes [Y] ?

Answering "Y" to this question will cause IOX to ask if you want to
exercise each tape drive which is in the system and is "ready".  A
tape drive is "ready" if it has a tape mounted, loaded, and write-
enabled.  As many as tweleve tape drives may be exercised.  Tape
testing will destroy all data written to the tape.

    Exercise Disks [Y] ?

Answering "Y" to this question will cause IOX to ask if you want
to exercise each disk drive which is spun up.  As many as sixteen
disk drives may be exercised.  Disk testing will only write to the
diagnostic area of a disk.  This should cause non-destructive
results.  If a disk unit is in question a full system backup should
be available as certain disk malfunctions may result in writes to
user data.

If you have requested that disks be exercised you will be asked:

    Do all I/O to the same cylinder [N] ?

Answering "Y" to this question will cause more transfers because the
disk heads will never be moved.  Answering "N" will provide for test-
ing more comparable to system usage because seeks will be quite frequent.

Once the exerciser has asked all its questions it will begin to test the
devices selected.  It tests the tapes and disks in the same fashion as
DISKX or TAPEX.  Refer to the documentation for those programs for
details of testing.  While IOX is running you may type ^G to terminate
it.  Typing any other character will cause status displays which are
similar to those produced by TAPEX and DISKX.  Refer to those documents
for details.