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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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Sys::Hostname::Long(3pm)				User Contributed Perl Documentation				  Sys::Hostname::Long(3pm)

Sys::Hostname::Long - Try every conceivable way to get full hostname SYNOPSIS
use Sys::Hostname::Long; $host_long = hostname_long; DESCRIPTION
How to get the host full name in perl on multiple operating systems (mac, windows, unix* etc) DISCUSSION
This is the SECOND release of this code. It has an improved set of tests and improved interfaces - but it is still often failing to get a full host name. This of course is the reason I wrote the module, it is difficult to get full host names accurately on each system. On some systems (eg: Linux) it is dependent on the order of the entries in /etc/hosts. To make it easier to test I have testall.pl to generate an output list of all methods. Thus even if the logic is incorrect, it may be pos- sible to get the full name. Attempt via many methods to get the systems full name. The Sys::Hostname class is the best and standard way to get the system hostname. However it is missing the long hostname. Special thanks to David Sundstrom and Greg Bacon for the original Sys::Hostname SUPPORT
This is the original list of platforms tested. MacOS Macintosh Classic OK Win32 MS Windows (95,98,nt,2000...) 98 OK MacOS X Macintosh 10 OK (other darwin) Probably OK (not tested) Linux Linux UNIX OS OK Sparc OK HPUX H.P. Unix 10? Not Tested Solaris SUN Solaris 7? OK (now) Irix SGI Irix 5? Not Tested FreeBSD FreeBSD OK A new list has now been compiled of all the operating systems so that I can individually keep informaiton on their success. THIS IS IN NEED OF AN UPDATE AFTER NEXT RELEASE. Acorn - Not yet tested AIX - Not yet tested Amiga - Not yet tested Atari - Not yet tested AtheOS - Not yet tested BeOS - Not yet tested BSD - Not yet tested BSD/OS - Not yet tested Compaq - Not yet tested Cygwin - Not yet tested Concurrent - Not yet tested DG/UX - Not yet tested Digital - Not yet tested DEC OSF/1 - Not yet tested Digital UNIX - Not yet tested DYNIX/ptx - Not yet tested EPOC - Not yet tested FreeBSD - Not yet tested Fujitsu-Siemens - Not yet tested Guardian - Not yet tested HP - Not yet tested HP-UX - Not yet tested IBM - Not yet tested IRIX - Not yet tested - 3rd hand information might be ok. Japanese - Not yet tested JPerl - Not yet tested Linux Debian - Not yet tested Gentoo - Not yet tested Mandrake - Not yet tested Red Hat- Not yet tested Slackware - Not yet tested SuSe - Not yet tested Yellowdog - Not yet tested LynxOS - Not yet tested Mac OS - Not yet tested Mac OS X - OK 20040315 (v1.1) MachTen - Not yet tested Minix - Not yet tested MinGW - Not yet tested MiNT - Not yet tested MPE/iX - Not yet tested MS-DOS - Not yet tested MVS - Not yet tested NetBSD - Not yet tested NetWare - Not yet tested NEWS-OS - Not yet tested NextStep - Not yet tested Novell - Not yet tested NonStop - Not yet tested NonStop-UX - Not yet tested OpenBSD - Not yet tested ODT - Not yet tested OpenVMS - Not yet tested Open UNIX - Not yet tested OS/2 - Not yet tested OS/390 - Not yet tested OS/400 - Not yet tested OSF/1 - Not yet tested OSR - Not yet tested Plan 9 - Not yet tested Pocket PC - Not yet tested PowerMAX - Not yet tested Psion - Not yet tested QNX 4 - Not yet tested 6 (Neutrino) - Not yet tested Reliant UNIX - Not yet tested RISCOS - Not yet tested SCO - Not yet tested SGI - Not yet tested Symbian - Not yet tested Sequent - Not yet tested Siemens - Not yet tested SINIX - Not yet tested Solaris - Not yet tested SONY - Not yet tested Sun - Not yet tested Stratus - Not yet tested Tandem - Not yet tested Tru64 - Not yet tested Ultrix - Not yet tested UNIX - Not yet tested U/WIN - Not yet tested Unixware - Not yet tested VMS - Not yet tested VOS - Not yet tested Windows CE - Not yet tested 3.1 - Not yet tested 95 - Not yet tested 98 - Not yet tested Me - Not yet tested NT - Not yet tested 2000 - Not yet tested XP - Not yet tested z/OS - Not yet tested KNOWN LIMITATIONS
Unix Most unix systems have trouble working out the fully quallified domain name as it to be configured somewhere in the system correctly. For example in most linux systems (debian, ?) the fully qualified name should be the first entry next to the ip number in /etc/hosts fred.somwhere.special fred If it is the other way around, it will fail. Mac TODO
Contributions David Dick Graeme Hart Piotr Klaban * Extra code from G * Dispatch table * List of all operating systems. Solaris * Fall back 2 - TCP with DNS works ok * Also can read /etc/defaultdomain file SEE ALSO
L<Sys::Hostname> AUTHOR
Scott Penrose <scottp@dd.com.au> COPYRIGHT
Copyright (c) 2001,2004,2005 Scott Penrose. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.8.8 2008-03-12 Sys::Hostname::Long(3pm)

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