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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Hardware’ Category

Using Google/Cloudflare/central DNS can bite you with large downloads

Posted by jpluimers on 2021/10/22

If you think download speeds are slow for large downloads (or multi-media playback is slow or quality is low) on a fast link, then consider your DNS.

Many people report that using one of the centralised DNS services (like Google/Cloudflare/…) causes slowness because they direct CDN lookups to a small pool of servers that get overloaded.

Some links:

Via [WayBack] How to check whether DNS is working through a browser? – Super User

Google DNS also allows for interactive querying, for example [WayBack] Google Public DNS

Result for atlassian-domain-for-localhost-connections-only.com/A with DNSSEC validation:

{
  "Status": 0,
  "TC": false,
  "RD": true,
  "RA": true,
  "AD": false,
  "CD": false,
  "Question": [
    {
      "name": "atlassian-domain-for-localhost-connections-only.com.",
      "type": 1
    }
  ],
  "Answer": [
    {
      "name": "atlassian-domain-for-localhost-connections-only.com.",
      "type": 1,
      "TTL": 1620,
      "data": "127.0.0.1"
    }
  ]
}

–jeroen

Posted in DNS, Internet, Network-and-equipment, Power User | Leave a Comment »

Would lvmraid have been improved over 2019? (back then: very single threaded, and does not leverage anything of the power of the actual device)

Posted by jpluimers on 2021/10/18

Reminder to self to check out if things have improved over time: [WayBack] Kristian Köhntopp on Twitter: “Trying my lvmraid kata from yesterday in real hardware was very frustrating. Everything is very single threaded, and does not leverage anything of the power of the actual device. … Basically, my linear-to-raid conversion idea died in the crib.” described to 2019 situation:

–jeroen

Posted in Hardware, Power User, RAID | Leave a Comment »

SSDs: favour TLC over QLC when they usage pattern is to have them relatively full

Posted by jpluimers on 2021/10/18

Some interesting observations at [WayBack] Intel brengt 665p-ssd van 1TB met 96-laags qlc-nandgeheugen uit – Computer – Nieuws – Tweakers.

–jeroen

Posted in LifeHacker, Power User, SSD | Leave a Comment »

Be sure to apply (SSD) storage firmware updates before it breaks

Posted by jpluimers on 2021/10/15

Various storage providers have had overflow issues in their storage firmware , so be sure to apply firmware updates.

Example (that includes HPE and Intel failures): [WayBack] Bepaalde HPE-sas-ssd’s gaan kapot na 32.768 uur – Computer – Nieuws – Tweakers.

–jeroen

Posted in Hardware, Power User, SSD | Leave a Comment »

For WiFi guest networks with a fixed SSID: QR code – Wikipedia

Posted by jpluimers on 2021/10/06

Access Denied

Access Denied

I knew it was possible to generate QR codes to access quest networks (as the QR code has credentials) for WiFi networks having a fixed SSID.

I just never bothered, but did when needed home care with quite a few different people providing the care.

Generating was easier than I anticipated, though I hoped I just could put the parameters in a URL and fire off to get a page including the QR code.

Alas, the pages I found require you to enter the SSID name and key/password phrase.

That’s OK: I have saved the PNG files for our network and my brother’s as images so I can put them on-line, and printed them out so guests can scan and use the network at once.

Here we go:

  • 124 network Access Denied, key 2171TB24
  • 171 network Disconnected, key 1060NP71

Related:

Read the rest of this entry »

Posted in Development, Fritz!, Fritz!Box, JavaScript/ECMAScript, Network-and-equipment, Power User, Scripting, Software Development, Web Development, WiFi | Leave a Comment »

 
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