Rob McNelly

Rob McNelly

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Recent Posts

  • Thoughts on Performance Tuning
  • The PowerVM Story Gets Better
  • Estimate rperf for your LPAR
  • Booting AIX in Debug Mode
  • Back Up Your HMC or Get Ready to Rebuild
  • Setting Up LPAR Error Notification

    Your shop has no budget for monitoring software, but you still want to be notified when LPAR errors appear in the AIX error log. You have a few options.

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    Posted: April 14, 2015 |

    The more Command and vi

    It's easy to overlook the simple things. For instance, did you know that vi can be invoked from within the more command?

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    Posted: April 07, 2015 |

    More Terrifying Tales of IT

    I enjoy reading IT-related horror stories, especially those that hit close to home. For me, the best thing about these stories is figuring out what went wrong and then incorporating those lessons into my own environments. Here are a couple of good reads that I want to share.

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    Posted: March 31, 2015 |

    Maxmizing IOPS

    Recently I listened to a discussion of the differences in input/output operations per second (IOPS) in various workload scenarios. People talked about heavy reads. They talked about heavy writes. They debated whether it was better to use RAID5, RAID6 or RAID10. Things got a little heated.

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    Posted: March 24, 2015 |

    Readers Discuss VIOS Installs

    Perhaps I wasn't clear when I explained why NIM is my VIO server installation option of choice. In any event, this reader's response got me thinking further about the topic:

    I prefer (to) install from the virtual media repository. It is faster with no network issue. Because when you start install always network is not ready yet. And when you are updating if your NIM is not up to date (lpp_source, spot, mksysb, ...) you take much time. With Virtual media repository you need just iso image to start install.

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    Posted: March 17, 2015 |

    It's Time to Snuff Out Commodity Servers

    During a recent lunch with customers, the topic of smoking came up. Some were talking about smoking hookahs, some were talking about cigars, and some were talking about cigarettes. One of the guys had recently quit smoking. He credited the Internet, which pointed him to information about e-cigarettes.

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    Posted: March 10, 2015 |

    The Laptop's Future, Revisited

    A reader had an interesting response to my recent post about the end(?) of desktop and laptop computers. With his permission, I'll share some of our email exchange:

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    Posted: March 03, 2015 |

    A Fun Look Back at Technology

    I like watching many of the old movies aired on TCM (aka, The Movie Channel). In addition to enjoying the stories being told, I just love seeing the clothing and the buildings and the landscapes of bygone eras. While I understand that much of what I'm viewing is actually black and white footage of Hollywood sets and interiors -- as opposed to the "real world" that existed back then -- I still find it fascinating to hear how people talked and see how they went about their daily lives.

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    Posted: February 24, 2015 |

    Connecting Your HMC to IBM Support, Revisited

    In this August 2014 post I discussed how to connect your HMC to IBM Support.  That post includes a link to a .pdf document that outlines the different connectivity options. However, this IBM technote seems easier to work with:

    The following is a list of ports used by the HMC. The "Inbound application" column identifies ports where the HMC acts as a server that remote client applications connect to. Examples of remote client applications include the browser based remote access and remote 5250 console. Ports used by remote clients need to be enabled in the HMC firewall. They must also be enabled in any firewall that is between a remote client and HMC.

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    Posted: February 17, 2015 |

    Another POWER8 Development Option

    If you're looking to develop software for POWER8 systems but don't have access to POWER8 hardware, there are options like the virtual loaner program or some kind of test system. You should also be aware of the IBM POWER8 Functional Simulator.

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    Posted: February 10, 2015 |

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