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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 BSD

iostat

IOSTAT(1)						      General Commands Manual							 IOSTAT(1)

NAME

       iostat - report I/O statistics

SYNOPSIS

       iostat [ drives ] [ interval [ count ] ]

DESCRIPTION

       Iostat  iteratively  reports the number of characters read and written to terminals per second, and, for each disk, the number of transfers
       per second, kilobytes transferred per second, and the milliseconds per average seek.  It also gives the percentage of time the  system  has
       spent in user mode, in user mode running low priority (niced) processes, in system mode, and idling.

       To  compute this information, for each disk, seeks and data transfer completions and number of words transferred are counted; for terminals
       collectively, the number of input and output characters are counted.  Also, each sixtieth of a second, the state of each disk  is  examined
       and  a  tally  is  made	if the disk is active.	From these numbers and given the transfer rates of the devices it is possible to determine
       average seek times for each device.

       The optional interval argument causes iostat to report once each interval seconds.  The first report is for  all time since  a  reboot  and
       each subsequent report is for the last interval only.

       The optional count argument restricts the number of reports.

       If  more  than  4  disk	drives	are configured in the system, iostat displays only the first 4 drives, with priority given to Massbus disk
       drives (i.e. if both Unibus and Massbus drives are present and the total number of drives exceeds 4, then some number of Unibus drives will
       not  be	displayed in favor of the Massbus drives).  To force iostat to display specific drives, their names may be supplied on the command
       line.

FILES

       /dev/kmem
       /vmunix

SEE ALSO

       vmstat(1)

4th Berkeley Distribution					  April 29, 1985							 IOSTAT(1)
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