Eric's Technical Outlet

Learning the hard way so you don't have to

Category Archives: Hardware

Microsoft Storage Spaces vs. AMD SB950 RAID

This is a quick comparison of a parity Storage Space vs. RAID-5 on the same system.

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New Book on Hyper-V Security

My second book is now available for purchase. Its name is Hyper-V Security. It’s a short-form book with only eight chapters. The first six are related to the host, the hypervisor, and the guests. The final two chapters were written by Andrew Syrewicze and cover security in System Center Virtual Machine Manager.

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10GbE is Certainly in Your Future, But Must It Be In Your Present?

It’s interesting to watch how people will become accustomed to a certain standard to the point that they have difficulty imagining any other standard. One fairly recent trend in some computing circles is the insistence that all new server systems come installed with 10GbE adapters by default. While their positions have merit, it’s not a good rule… yet.

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Defrag (Is) For Dummies

Kind of funny how one little word really changes the meaning of a sentence, doesn’t it? The title is a bit harsh but there is more than a little truth in it.

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How Android 4.2 and Firefox 19 Made Me Miss Microsoft

During the last couple of presidential cycles, the opposing candidate did a better job of getting me to vote against him than his rival did. The latest versions of Android on my phone and Firefox on my desktop are doing the same thing. Here I am, with papers to write for University, a major project to produce work for, and I need to get it all done in time to get some decent sleep because I need to be well-rested for my day job. But my normal tools of choice are holding me back. The bad thing is that they’re the ones that were supposed to save us from the bloated, unstable, user-unfriendly competition. The saviors have become the monsters.

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1920 Error in Equallogic HIT Kit on Windows Server/Hyper-V 2012

As of this writing, I don’t believe that Equallogic/Dell is officially supporting Windows Server 2012 or Hyper-V 2012, but I can confirm that the HIT kit will install and run just fine on Hyper-V 2012. Follow these steps at your own risk.

Updated January 4, 2013: HIT Kit 4.5 has been released with support for Windows Server 2012. Please see Andreas Berg’s comment below for the link.

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Dell OpenManage Server Administrator 7.1 on Server Core or Hyper-V

Dell has done something to the installer for the recent version of OpenManage Server Administrator so that it doesn’t work on Server Core, which includes native installations of Hyper-V.

Symptoms

  1. Running “X:\windows\PreReqChecker\RunPreReqChecks.exe /s” errors out with “omchecks has stopped working”
  2. The installer (accessed by running “msiexec /i X:\windows\SystemsManagement\SysMgmt.msi” stops with the error “Failed to load OMIL library”

Solution

Install OpenManage Server Administrator 6.5 first (the command on that CD is “msiexec /i X:\SYSMGMT\srvadmin\windows\SystemsManagement”). As soon as that installer finishes, you’ll be able to install 7.1 without error. If you haven’t got the older installation media, you can download it from Dell’s site. If your particular server is too new to have 6.5 available, check the download list for earlier servers, such as the PowerEdge R515.

You do not need to perform any cleanup on 6.5 as 7.1 replaces it very cleanly.

Additional Information

I’ve had some strange and not always reproducible problems installing other Dell update packages, usually drivers, on Server Core and Hyper-V whenever OMSA is not installed or is out-of-date. The one I remember most clearly was related to the Lifecycle Controller.

It’s NOT the Network, the Hypervisor, or the OS!

I’ll do my best to keep this posting on an even keel and not let it devolve into a rant, but no promises. As I poke around in various technical forums, whether LinkedIn or Spiceworks or TechNet or whatever, a new theme is popping up. People are complaining that they’ve dropped in a shiny new 10G network and just can’t figure out why it’s not any faster than their old 1GB network, or they’re using internal/private networks inside Hyper-V or ESX and they don’t go any faster than a standard copper line. In a couple of cases, I’ve actually taken the effort to try to explain what’s going on, but usually it falls on deaf ears. This post serves as both an explanation and an appeal to the more sensible administrators out there to look at what’s really going on.

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iSCSI Disk Appears Two or More Times in Disk Management

Scenario: You connect your Windows or Hyper-V system to a new iSCSI target device that supports multi-path I/O (MPIO) and add a session for each iSCSI NIC in the server. When you get the disk established in Disk Management, it shows up twice. You can bring one online, but any others show “Offline (The disk is offline because it has a redundant path with another device)”.

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SCVMM Maximum disk I/O per second setting

There is a bug in SCVMM, both RTM and SP1, that doesn’t properly handle the possible values for this field. That was fixed in a later rollup. The default value is still too low for most installations.

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