Tag Archives: powershell

Wrong iovDisableIR setting on ProLiant Gen8 might cause a PSOD

TL;DR: There’s a script at the bottom of the page that fixes the issue.

Some days ago, this HPE customer advisory caught my attention:

Advisory: (Revision) VMware – HPE ProLiant Gen8 Servers running VMware ESXi 5.5 Patch 10, VMware ESXi 6.0 Patch 4, Or VMware ESXi 6.5 May Experience Purple Screen Of Death (PSOD): LINT1 Motherboard Interrupt

And there is also a corrosponding VMware KB article:

ESXi host fails with intermittent NMI PSOD on HP ProLiant Gen8 servers

It isn’t clear WHY this setting was changed, but in VMware ESXi 5.5 patch 10, 6.0  patch 4, 6.0 U3 and, 6.5 the Intel IOMMU’s interrupt remapper functionality was disabled. So if you are running these ESXi versions on a HPE ProLiant Gen8, you might want to check if you are affected.

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Creating console screenshots with Get-ScreenshotFromVM.ps1

Today, I had a very interesting discussion. As part of an ongoing troubleshooting process, console screenshots of virtual machines should be created.

The colleagues, who were working on the problem, already found a PowerCLI script that was able to create screenshots using the Managed Object Reference (MoRef). But unfortunately all they got were black screens and/ or login prompts. Latter were the reason why they were unable to run the script unattended. They used the Get-VMScreenshot script, which was written by Martin Pugh.

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Checking the 3PAR Quorum Witness appliance

Two 3PAR StoreServs running in a Peer Persistence setup lost the connection to the Quorum Witness appliance. The appliance is an important part of a 3PAR Peer Persistence setup, because it acts as a tie-breaker in a split-brain scenario.

While analyzing this issue, I saw this message in the 3PAR Management Console:

In addition to that, the customer got e-mails that the 3PAR StoreServ arrays lost the connection to the Quorum Witness appliance. In my case, the CouchDB process died. A restart of the appliance brought it back online.

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Tiny PowerShell/ Azure project: Deploy-AzureLab.ps1

One of my personal predictions for 2017 is, that Microsoft Azure will gain more market share. Especially here in Germany. Because of this, I have started to refresh my knowledge about Azure. A nice side effect is that I can also improve my PowerShell skills.

Currently, the script creates a couple of VMs and resource groups. Nothing more, nothing less. The next features I want to add are:

  • add additional disks to the DCs (for SYSVOL and NTDS)
  • promote both two servers to domain controllers
  • change the DNS settings for the Azure vNetwork
  • deploy a Windows 10 client VM

I created a new repository on GitHub and shared a first v0.1 as public Gist. Please note, that this is REALLY a v0.1.

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Surprise, surprise: Enable/ disable circular logging without downtime

As part of a troubleshooting process, I had to disable circular logging on a Microsoft Exchange 2013 mailbox database, that was part of a Database Availability Group (DAG).

What is circular logging? Microsoft Exchange uses log files that record all transactions and modifications to a mailbox database. In this case, Exchange works like MS SQL or Oracle. These log files are used, to bring the database back to a consistent state after a crash, or to recover a database to a specific point-in-time. Because everything is written to log files, the number of log files increases over time. Log files are truncated, as soon as a successful full backup of the database is taken.

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HPE ProLiant PowerShell SDK

Some days ago, my colleague Claudia and I started to work on a new project: A greenfield deployment consisting of some well known building blocks: HPE ProLiant, HPE MSA, HPE Networking (now Aruba) and VMware vSphere. Nothing new for us, because we did this a couple times together. But this led us to the idea, to automate some tasks. Especially the configuration of the HPE ProLiants: Changing BIOS settings and configuring the iLO.

Do not automate what you have not fully understood

Some of the wisest words I have ever said to a customer. Modifying the BIOS and iLO settings is a well understood task. But if you have to deploy a bunch of ProLiants, this is a monotonous, and therefore error prone process. Perfect for automation!

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Get-MailboxDatabase doesn’t show last backup timestamp

Sometimes you have to check when the last backup of an Exchange mailbox database was taken. This is pretty simple, because the timestamps of the last full, incremental and differential backup is stored for each mailbox database. You can check these attributes using the Exchange Control Panel (ECP), or you can use the Get-MailboxDatabase cmdlet.

Backup successful, but no timestamp?

Take a look at this output. As you can see, there’s no timestamp for the last full, incremental and differential backup. But this database was successfully backuped some minutes before.

Missing -status switch

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Exchange Management Shell (EMS) and new PowerShell releases

Some day ago, I installed a new Exchange 2013 CU11 for some test ins my lab. Nothing fancy, just a single server deployment on a Windows Server 2012 R2 VM. I deployed this Windows Server from a template, which was updated with the latest Windows Patches and WMF some days ago. The Exchange setup went smooth. I updated the SSL certificates and the internal and external URLs for the virtual directories. Then I started the Exchange Management Shell (EMS), to update the Autodiscover URL in the service connection point (SCP) of the Active Directory.

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PowerShell ISE on steroids

I’m not a developer. I deal mainly with infrastructe, things like virtualization, storage & backup, networking etc. Sometimes I had to write scripts, primarily PowerShell, batch or Bash. Many years back, I also wrote Csh and Ksh scripts. In the past years, automation was one of the rising trends in the infrastructure segment. And with automation, new challenges came up. Today I have to work with Windows PowerShell, in case of VMware with PowerCLI (which bases on Windows PowerShell), and sometimes I have use with REST APIs. I’m still not a developer. Due to this fact, I need tools that help me getting my work done.

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PowerCLI: Get-LunPathState

Careful preparation is a key element to success. If you restart a storage controller, or even the whole storage, you should be very sure that all ESXi hosts have enough paths to every datstore. Sure, you can use the VMware vSphere C# client or the Web Client to check every host and every datastore. But if you have a large cluster with a dozen datastores and some Raw Device Mappings (RDMs), this can take a looooong time. Checking the path state of each LUN is a task, which can be perfectly automated. Get a list of all hosts, loop through every host and every LUN, output a list of all hosts with all LUNs and all paths for each LUN. Sounds easy, right?

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