Dial-up over VoIP

 —  Category: reference, retrocomputing, networking, Cisco, dial-up, VoIP, POTS Tags:

Snippet - oVirt disk resize failed due dirty bitmap


My oVirt cluster's storage is pretty slow, so certain disk operations time out. As a result, I wasn't able to resize a disk, because the QCOW2 bitmaps were corrupt. Here's how to fix it!

My situation

  • oVirt 4.5 cluster (should work for 4.3 and 4.4)
  • Hosted Engine …
Category: oVirt, RHV, qemu, linux Tags:

Building a Dial-up server with a Cisco 2600


I've been lugging around an old Cisco 2620 Router with an NM-8AM analogue modem line card for a few years. I recently got a Cisco SPA122, and figured I might as well make a dial-up server.

Category: reference Tags:

HP 1660C Logic Analyser - Network Interface reference


I have a HP 1662C Logic Analyser, which I've upgraded with a network upgrade (Option 015).

The capabilities this adds is a fun little set of options to control the analyser:

  • "HP-IB"-ish control via "Pseudo-telnet" (raw TCP socket on port 5025)
  • FTP - for files (/data) and management (/control)
  • NFS …
Category: reference Tags:

Update the UEFI Secure Boot shim in debian, for fwupdmgr


Debian 11's version of the Secure Boot shim is a bugged version (< 15.7) that doesn't parse arguments properly [1] . fwupdmgr uses these arguments to boot an EFI application that then triggers a system firmware update.

To do my firmware update, I need to obtain a working / patched version of …

Category: snippet Tags:

Snippet - DISM - The source files could not be found (0x800f081f)



You've found that your VM / computer has some file corruption issues, and when you're trying to run a windows update or a DISM /RestoreHealth, it reports

C:\Windows\system32>dism.exe /online /cleanup-image /restorehealth

Deployment Image Servicing and Management tool
Version: 10.0.14393.4169

Image Version: 10.0 …
Category: snippet Tags:

Fully restarting an oVirt / RH-V Cluster


My oVirt cluster runs on an NFS server that gets regular updates. As a result, I've nailed down a concrete process to fully shut down the cluster and start it back up again.


  1. Shutdown all VMs
  2. Maintenance all hosts except the one running the hosted engine (migrate it to …
Category: snippet Tags:

Snippet - Windows Update Error 0x80244010



You've just installed a new Windows Vista / 7 PC / VM for whatever reason (I'm not here to judge!) and you've connected it to your WSUS server. Upon triggering a search for updates, you're met with an error:

Windows could not search for new updates

An error occurred while checking …

Category: snippet Tags:

Snippet - Persistent names on PulseAudio devices


PulseAudio allows you to set names for audio inputs and outputs using pacmd update-sink-proplist, but this only works if the device is present when the rules are run. This works perfectly fine for renaming the built-in sound devices, but doesn't work for my new USB DAC. If the DAC isn't …

Category: snippet Tags:

Osborne 1 - Investigation and Restoration


I just got an Osbone 1, in mostly-working-condition. Let's have a look at it.


I bought this from a seller on the local used item website, and while it's very yellowed in large swaths, it does appear to work! It was demoed to me working, so I at least …

Category: retrocomputing Tags:

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