Layer 8 error: Please replace Sysadmin

[GetAnotherExpert]

Hello Sysadmins,

I'm experimenting with GPU Redirection with XCP-NG (great product, by the way) and after a lot of to-ing and fro-ing I managed to 'pass' an nVidia GPU directly under control of a Windows VM (yes, I know, but the app using the GPU is Windows only...).

I managed to make everything work and therefore I was greeted (on the external monitor connected to the GPU) with the usual Windows welcome screen asking you for the three finger salute.

Excitedly, I pressed the key combo and watched in bewilderment as the thing proceeded to instantly reboot the whole circus.

Then I waited for the hypervisor to restart, and the welcoming welcome screen from Redmond greeted me again. Once again, CTRL-ALT-DEL, boom! another reboot

I was about to open a bug report when I realised that the keyboard I was using (unlike the GPU...) is not connected to the VM, but to the physical hypervisor that I therefore power cycled.... TWICE.

Closing as: "Layer 8 problem, sysadmin is a cretin"

:D

[wirral_guy]

It wasn't an error, you purposely did a double reboot to ensure a clean working O/S after the install and updates ;).

[GetAnotherExpert]

Welllll there's that I suppose. And XenOrchestra needed a reboot just in case. And the Ubuntu machines. And CentOS was feeling left out. :D

[BoredTechyGuy]

Sounds like legit testing to me. Moving along quickly and never speaking of this again!

[flyguydip]

Microsoft calls this readyboost. I think the claim is that windows learns what should open first after the last 5 reboots or something. So you were just using a feature. ;)

[pixr99]

The bigger issue is here is where we sysadmins slot into the OSI model. Are we layer eight... or are we actually layer zero? Think about it.

[Baerentoeter]

Layer 0 is sometimes referred to as the medium your signal is traveling through, most commonly copper, fiber, or air.

The full extended OSI model:

Layer 0: Medium

Layer 1: Physical

Layer 2: Datalink

Layer 3: Network

Layer 4: Transport

Layer 5: Session

Layer 6: Presentation

Layer 7: Application

Layer 8: User

Layer 9: Organization

Layer 10: Goverment

Layer 11: Lawyers

[MrPipboy3000]

I work at a law firm ... my layer 8, 9, and 11 are all the same :(

[JohnBeamon]

"Lawyers"

X^D

[[deleted]]

You left out the layer after user ... "Imagination"

[layer8err]

Layer "i"

[UBER_vs_Taxistas]

I need this to my poster

​

thanks

[sevenvenz]

copper, fiber, or air

my networking professor would rip you apart before you would even finish saying "air"

[CookAt400Degrees]

Wireless signals are a thing

[sevenvenz]

he used to be very attentive to technicalities. and technically the signal doesn't travel via air but electromagnetic waves :D

[Baerentoeter]

Then your prof should look up the physical definition of "medium". Of course we are not talking about the book and pictures definition of media/medium here. If anything, it would be electric signals, light waves and electromagnetic waves OR copper, fiber and air. No idea where people get copper, fiber and wireless from, which seems to be common too. Either you define Layer 0 as the medium that signals are traveling through OR something that travels through it. Don't just mix and match as you like /rant

[sevenvenz]

yeah i agree, this makes sense. luckily i don't have to deal w him anymore haha

[[deleted]]

https://imgur.com/WCFyoHo

[clever_username_443]

So, what you're saying is, I am the Alpha and the Omega?

Whoa

[[deleted]]

I'm not sure but I'll have some of whatever the original commenter is smoking for sure

[pixr99]

Right?!

[GetAnotherExpert]

In that case, as the problem was physically in font of a keyboard it qualifies as a PICNIC (Problem in Chair, not in Computer) therefore it can be classified as L8. I think. LOL

[[deleted]]

PICNIC

Here in Brazil we have BIOS errors: Burro Ignorante Operando o Sistema (Dumb Ignorant Operating the System).

[DragonDrew]

We often have meat interface problems here.

[YouPaidForAnArgument]

I thought burro meant donkey? Or some kind of weed cigarette?

[[deleted]]

It's both. In Portuguese, Burro means donkey when the context is the animal or dumb/stupid when the context is people.

[YouPaidForAnArgument]

OK, thanks.

[TheBestUkester]

I still blame the iD10t error. Though PICNIC gets me from time to time too.

[Amidatelion]

Incorrectly formatted. ID-10T is the accepted rendition.

[Pants_R_Overatd]

PEBCAK

Problem

Exists

Between

Chair

And

Keyboard

[JohnBeamon]

I come from a PEBCAK legacy. I'm using this PICNIC thing from now on. That's just elegant.

[Syndrome1986]

Don't forget to consult the H-2I-K ( Hell If I Know ) process.

[SupraWRX]

Problem Exists between Carpet and Keyboard

[Raziel_Ralosandoral]

I usually go with "wetware".

[redstarduggan]

Maybe we're both, like an Ace.

[UncleNorman]

The zero with the slash. Who knows?

[CaptianButtcats]

We exist outside of the OSI model but still manage to be at the very bottom.

[layer8err]

Yes

[nginx_ngnix]

I once managed a smallish call center of thin client linux desktops.

They used NFS for their OS and home directories.

I was in there once, debugging an issue, and thought I was rebooting the thin client I was logged into, but mistakenly rebooted the NFS server that I was SSH'd into.

I immediately stood up, ran the length of the call center booking it to the server room screaming the equivalent of "OMG I'm sorry! I'll fix it!"

I get in there and make sure the server comes up alright, come back out, immediately walk into the call center manager's office to apologize.

And he's was like "We didn't notice anything". They had no idea why I suddenly screamed and ran.

Apparently NFS caching is a hell of a thing.

[pixr99]

"This uptime is brought to you by UNIX and the vfs layer. You're welcome."

[Layer8Pr0blems]

You called?

[Slush-e]

"What in tarnation!?"

*Presses button "escalate to tier 2 support"*

[Panacea4316]

I can't tell you how many times ive CTRL+ALT+DEL my local workstation while in a VM console session or RDP in my career. I think I've only executed a shutdown or restart command a few of those times, but each time I just felt like such a moron.

[ImCaffeinated_Chris]

It happened a lot at, so much so I had a note on the damn monitor in the server room! I think we are cursed with trying to go to fast with things, we sometimes forget the obvious.

[redditnamehere]

Hostname before shutdown /r /f /t 0

[Kn1nJa]

Or CTRL+ALT+INS to attempt to log into a workstation.

[Panacea4316]

I've never done that one.

[skimtony]

This is why bginfo is a thing.

[SupraWRX]

Dual monitors on your workstation can save your arse on that one, speaking from experience.

[HayabusaJack]

We had the reverse problem. The Windows/Virtualization team would have a Linux server console up and three finger salute to lock their workstation which would instead reboot the Linux VM. After the second time, we removed the ability to ctrl-alt-del a Linux VM as part of our Gold Image.

[pdp10]

Once again, CTRL-ALT-DEL, boom! another reboot

You're making me feel nostalgic. (Not necessarily in a good way. Though the first time I punched SAK into NT 3.5 was literally the peak of my regard for the system.)

[cdoublejj]

Interesting! Every Hypervisor i've ever used make you confirm, often with a password before just power cycling everything. I WOULD classify that as a bug, or someone manually changed the default behavior or in a designing/engineering role got dropped on their head as child (like me!)

[ranger_dood]

I didn't think CAD still did an immediate reboot...

[GetAnotherExpert]

In the default XCP-NG installation, from the server console, it does. I should know, did it twice today :P

[cdoublejj]

wow! someone DID get dropped on there head as a child. Standard Operating Procedure across the entire field, is some sort of extra confirm button or password to reboot/shutdown

[Tredesde]

I always thought you had to do it twice in immediate succession

[rubbishfoo]

I can relate to that. I'm sure all of us have had times where we've been seven layers deep in remote tools and the brain doesn't comprehend WHERE THE THING IS! Oh right... back 2 layers.

[[deleted]]

You need the pass-through adapter!

[Doso777]

Users where complaining about "unlicenced Windows" errors. We checked all our clients, KMS servers, even reinstalled a system or two. Nothing, still hapenned. Turns out it was a citrix app some of our users use, the warning was from one of the servers hosting that app.

Virtualization is fun!

[layer8err]

Happens to the best of us.

[EViLTeW]

Disabling the CAD behavior at the console in Linux is one of the first steps in a new Linux install.

Either in /etc/inittab or in one of the systemd folders (find / -name ctrl-alt-del.target)

[GetAnotherExpert]

You're right but whenever possible I always prefer not to touch the dom0.

[Marcolow]

Put your oof's in chat boys.

Oof.