Rob McNelly

Rob McNelly




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Recent Posts

  • Living with Legacy
    12/12/2017
  • The POWER9 Journey Begins
    12/05/2017
  • Using lvmo to Migrate LVM Performance Tuning Values
    11/28/2017
  • Losing a Laptop
    11/21/2017
  • On Becoming a Sponsor User
    11/14/2017
  • The Important Work of Certification Test Writing

    I've once again been working with teams that are updating various certification tests. I enjoy the interaction with tech pros from around the world as we devise test questions and answers.

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    Posted: December 22, 2015 |

    Calculating Hypervisor Memory Overhead

    A customer recently contacted IBM Support, wondering how much memory the hypervisor could be expected to consume in their real world environment. Even given how inexpensive memory has become and how convenient it is to add and modify partitions as needed, customers can benefit by planning for their expected workloads as well as their hypervisor and VIO server memory overhead.

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    Posted: December 15, 2015 |

    The Costs of Technical Debt

    As often as I see it, it still surprises me when I encounter a company that depends on some application, but chooses to run it on unsupported hardware without maintenance agreements and/or vendor support. If anything goes sideways, who knows how they will stay in business.

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    Posted: December 08, 2015 |

    Moving an AIX System

    If you're tasked with migrating, duplicating or cloning your system from old to new hardware, how do you go about it?

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    Posted: December 01, 2015 |

    Getting Started with Spectrum Scale

    This post is about the recently published IBM Redbook that covers the IBM Spectrum Scale (formerly GPFS).

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    Posted: November 24, 2015 |

    Replacing Disks with replacepv

    IBM developerWorks recently posted this piece about replacing a boot disk in PowerVC. The developerWorks article mentions the replacepv command. I haven't messed around with replacepv, but once I read about its capabilities, I was impressed.

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    Posted: November 17, 2015 |

    A Different View of Virtualization

    This article examines the issues VMware and x86 customers face as they try to virtualize their environments.


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    Posted: November 10, 2015 |

    A List of System Scanning Tools

    What kinds of tools do you use to document and check your systems? I've written about prtconf, a built-in tool, and hmcscanner, but many other solutions are available.

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    Posted: November 03, 2015 |

    HMC installios Cleanup

    Awhile back, I was called in to assist an IBM i heritage customer that encountered difficulty installing a VIO server from their HMC.

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    Posted: October 27, 2015 |

    An Underutilized PowerHA Option

    Awhile back, IBM's Chris Gibson offered a PowerHA tip that you might have missed. You can use SEA poll_uplink method (requires VIOS 2.2.3.4). In this case SEA can pass up the link status, no "!REQD" style ping is required any more.

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    Posted: October 20, 2015 |

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