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Full Discussion: Wrong Array...
The Lounge War Stories Wrong Array... Post 303018166 by xenix on Wednesday 30th of May 2018 04:29:55 PM
Old 05-30-2018
Wrong Array...
Back in my early days, just starting at my first job where I was doing 100% UNIX...

We had a mixture of Solaris, AIX, and HPUX systems. Our most critical systems (Logistics) was running on a bunch of large HP 9000 servers. I was tasked with decommisoning one of the servers.

It was one of those arrangements where there was three cabinets in a row. One large HP 9000 on each side, and the middle was used to store the boot disks, tape drives, optical drives, etc.

Well, long story short.. I hit the power button on the wrong storage cabinet. Did a few other things... Casually walked back to my desk. It was a good 20 minutes later.

All of a sudden, people are screaming.. PROD IS DOWN.. PROD IS DOWN. I thought, great.. Another fun day....

A few minutes later, it dawned on me that the drives for the production server was in the same rack that I was decommissioning. So, I walked back down to the data center to verify... Sure enough. I hit the wrong button.

I turned the array back on, walked back to my desk, and could now login again, and everything was fine. To my surprise.. There was no fallout from this. This system just completely hung... once the storage was turned back on, it just kept on going where it left off.
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LEARN ABOUT HPUX

mt

mt(1)							      General Commands Manual							     mt(1)

NAME

       mt - magnetic tape manipulating program

SYNOPSIS

       tapename] command [count]

   Obsolescent
       tapename] command [count]

DESCRIPTION

       is used to give commands to the tape drive.  If tapename is not specified, the environment variable is used; if is not defined, the default
       drive is used.

       winds the tape in the requested direction (forward or backward), stopping after the specified count EOF marks or records  are  passed.	If
       count  is  not  specified,  one	is assumed.  Each EOF mark counts as one record.  When winding backwards, the tape always stops at the BOT
       marker, regardless of the number remaining in count.

       accepts the following commands:

	      Write	count EOF marks.

	      Forward space
			count files.

	      Forward space
			count records.

	      Backward space
			count files.

	      Backward space
			count records.

	      Rewind tape.

	      Rewind tape and go offline.

	      Seek to end of data (DDS and QIC drives only).

	      Write	count setmarks (DDS drives only).

	      Forward space
			count setmarks (DDS drives only).

	      Backward space
			count setmarks (DDS drives only).

	      Print status information about the tape drive.

	      Reserve tape drive for sole use by the host issuing the
			command (stape or estape driver only).

	      Release tape drive from sole use by the host issuing the
			command (stape or estape driver only).

       Spacing operations (back or forward space file or record) leave the tape positioned past the object being spaced to  in	the  direction	of
       motion.	That is, backspacing a file leaves the the tape positioned before the file mark, forward spacing a file leaves the tape positioned
       after the file mark.  This is consistent with all classical usage on tapes.

WARNINGS

       Only raw, no-rewind Berkeley-type devices should be specified.  This type of device will not reposition the tape upon close.  An example of
       such a device is or See mt(7) for more details.

       It is possible to wind the tape beyond the EOT marker and off the end of the reel.

       A  reservation  may  only be cleared with a release by the host that issued the original reserve. In the event that the host that holds the
       reservation is no longer available, the command may be used to reclaim the device by issuing a bus  device  reset.   See  st(1M)  for  more
       details.

       The reserve/release functionality can only be issued to drives using the or driver.

EXAMPLES

       Rewind the tape associated with the device file or (if legacy DSF is disabled):

FILES

       Raw magnetic tape interface (stape)
       Raw magnetic tape interface (estape)
       Default tape interface.
			   If legacy DSF is disabled, the default value is

AUTHOR

       was developed by the University of California, Berkeley.

SEE ALSO

       dd(1), st(1M), intro(7), mt(7).

																	     mt(1)
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