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The Lounge War Stories Prize of being an Admin Post 302651131 by bakunin on Tuesday 5th of June 2012 04:05:40 AM

06-05-2012

Registered User

Quote:

Originally Posted by hedkandi

..dont get me started on the 1st level support guy whom renamed a system to a single numeric value of "2" His excuse was that he wasn't aware what uname -S does in UNIX..last I checked he's still there

Well, in my last project i had such a colleague too: Once, the storage guy (also an AIX expert) wanted to do some performance tests. He created an empty LUN, imported it as hdisk device and wrote to this device directly using dd. His point was to not let the file system drivers mess up his measurement.

So far, so logical and absolutely correct. Now, enter the idiot: he saw what the storage guy did and us discussing the results. Three days later a productive system broke with some strange errors and was unable to boot again. The disks in the rootvg were damaged to an extent that even the PVID and the LVCB (partition information) were missing. It transpired, that he did "performance tests" too. But because he didn't really understand what the storage guy was doing, he didn't get himself a new and empty disk for that, but used the system disk to overwrite the first physical GB with hexadecimal zeros. Well, the disk was mirrored and the system would have survived that - but doing thorough work he did it on the second system disk too. Guess what happens, when both copies of a mirrored disk are destroyed.

We would have been able to restore the system pretty quickly using an mksysb from our central NIM server - unfortunately he had used not only the production system but this very system, our centralized software repository for all the AIX systems - for his "performance tests" too (along with a couple of other systems, but we found that out later). Most systems boot only very slowly from nulled out boot disks....

This guy is there in in systems administration for more then ten years now and this was not even the first time he did something this idiotic. Go figure.

bakunin

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volunroot

volunroot(8)						      System Manager's Manual						      volunroot(8)

NAME

       volunroot - Remove Logical Storage Manager hooks for rootable volumes

SYNOPSIS

       /usr/sbin/volunroot [-a	| -A]

OPTIONS

       Specifies  that	all  volumes on the system disk be converted back to UNIX disk partitions, not just the root and swap volumes, rootvol and
       swapvol.  Forces removal of the private region unless it is the last one in the system.

DESCRIPTION

       The volunroot script can be used to restore the accessibility of the root, swap, and other file systems on the boot disk  directly  through
       disk  partitions  instead  of  through volume devices. The script also removes other changes that were made to enable booting of the system
       from the root volume, so that the system will boot with no dependency on the Logical Storage Manager.

       When used with no options, volunroot affects only the root and swap volumes, rootvol and swapvol.

       For volunroot to work properly, only one plex must exist for each of the affected volumes. This plex must be the one created by	volrootmir
       or the original plex created when the root disk was encapsulated. This ensures that the underlying subdisks will have equivalent partitions
       defined for them on the disk.

       If these conditions are not met, the volunroot operation fails and none of the volumes are converted to disk partitions.

       The unwanted plexes can be removed using either voledit or volplex.

SEE ALSO

       volencap(8), voldiskadm(8), voledit(8), volintro(8), volplex(8), volrootmir(8)

																      volunroot(8)