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Full Discussion: Prize of being an Admin
The Lounge War Stories Prize of being an Admin Post 302651131 by bakunin on Tuesday 5th of June 2012 04:05:40 AM
Old 06-05-2012
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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bootconf(4)						     Kernel Interfaces Manual						       bootconf(4)

NAME
bootconf - boot device configuration table DESCRIPTION
The file contains the address and disk layout type of the system's boot devices or lif volumes. It is used by the and HP-UX kernel control scripts (fileset to determine how and where to update the initial boot loader. Normally the kernel's script queries the system's hardware and creates the file. In rare cases when either the system configuration cannot be automatically determined or additional and/or alternate boot devices should be automatically updated, the administrator must edit the file manually. There is one line in the file for each boot device. Each line contains the following blank-separated fields in the order shown: disk type A flag indicating how the file system(s) on the disk are laid out. The flag must be one of the following: Indicates that the root disk is in LVM or VERITAS Volume Manager (VxVM) format. If LVM or VxVM mirrors are used, then each of the "mirrors" must have its own line in the file. Indicates that the root disk is in the "whole disk" format with no partitions, but boot and swap space are reserved outside the file system. device file The absolute path of the device special file that accesses the physical device where the boot area is located. For LVM root disks, the device special file is the physical volume(s) returned by the command. For "whole disks" this is the device file that references the entire disk. Blank lines are permitted. Any line beginning with a is considered to be a comment. DIAGNOSTICS
The Software Distributor log file contains diagnostic messages under the fileset if the file is incorrect. Most of the messages are self- explanatory; a few warrant additional explanation: If there are no other messages about the file is probably empty. Otherwise, the file is not in the proper format, and the other messages will explain what the problem is. The specified device file does not point to a disk where there is a lif which contains the file Some character other than or is in the first field of a line. As of release 10.0, the boot areas in must all be on the same type of disk layout. There are characters after the device file specification. EXAMPLES
The boot area is on an LVM root disk: l /dev/disk/disk7_p2 The boot area is on a whole disk layout: w /dev/disk/disk7 WARNINGS
All of the boot devices in the file must have the same disk layout. AUTHOR
was developed by the Hewlett-Packard Company. FILES
SEE ALSO
mediainit(1), hpux(1M), hpux.efi(1M), mkboot(1M), vgdisplay(1M), lif(4), intro(7). documentation. bootconf(4)
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