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by ejolson
Sat May 23, 2020 7:15 pm
Forum: Networking and servers
Topic: iSCSI Root Like a Data Center
Replies: 26
Views: 1288

Re: iSCSI Root Like a Data Center

In this post we add security to the iSCSI drive based on the challenge handshake authentication protocol. There are four places where the password needs to be added: To The NAS providing the share. cmdline.txt on /dev/mmcblk0p3. /etc/iscsi/iscsid.conf on /dev/mmcblk0p2. iscsid.conf on the network bl...
by ejolson
Sat May 23, 2020 4:54 am
Forum: Networking and servers
Topic: iSCSI Root Like a Data Center
Replies: 26
Views: 1288

Re: iSCSI Root Like a Data Center

Security will have to wait. With apologies to Liam Sternberg and The Bangles, All the old programs on the NAS They do the iSCSI dance don't you know If they execute too quick (go boot go) They're paging out like a domino It's so bizarre with the Pi Invisible options for a bet SDHCI crocodiles (go bo...
by ejolson
Sat May 23, 2020 12:54 am
Forum: Networking and servers
Topic: iSCSI Root Like a Data Center
Replies: 26
Views: 1288

Re: iSCSI Root Like a Data Center

So picking up where we were before watching all those reruns of Fraggle Rock, let's continue on this short journey of iSCSI root like a data center. Assuming you still have the network block device /dev/sda1 mounted under /iroot on the Pi 4B, edit the file /iroot/etc/fstab so it looks like proc /pro...
by ejolson
Fri May 22, 2020 10:10 pm
Forum: Off topic discussion
Topic: What do you guys store your pi boards in when not in use?
Replies: 29
Views: 1411

Re: What do you guys store your pi boards in when not in use?

What he suggested is better than having the Pi floating in free air waiting to be zapped by an approaching finger. Or dropped onto a nylon carpet. My Pi does not float in free air. Could it be defective? Back on topic, I've kept all the anti-static bags that anything ever came in so it's easy to pu...
by ejolson
Fri May 22, 2020 6:31 pm
Forum: Troubleshooting
Topic: RPi4-4GB: How easy to blow up the USB chip?
Replies: 22
Views: 594

Re: RPi4-4GB: How easy to blow up the USB chip?

Flat and thin and not very robust on mine. Floating and not fastened down and more flimsy than the regular USB2 pads. Maybe due to cheap chinese cutting corners or part of the USB3 mechanical spec IDK. One or two pins in the upper row were bent slightly out of place on the ones I was able to repair...
by ejolson
Fri May 22, 2020 6:06 pm
Forum: Off topic discussion
Topic: What do you guys store your pi boards in when not in use?
Replies: 29
Views: 1411

Re: What do you guys store your pi boards in when not in use?

I suppose I should add this "storage" technique... Back before the Bay Area monthly Jam failed (the venue started wanting money), I would store between jams and transport to each Pi in a 1-gal. size Ziplock bag, together with all of it's small support parts: PSU, HDMI cable, mouse, monitor power ca...
by ejolson
Thu May 21, 2020 11:50 pm
Forum: Networking and servers
Topic: iSCSI Root Like a Data Center
Replies: 26
Views: 1288

Re: iSCSI Root Like a Data Center

As with the magical pipes of Cantus in Fraggle Rock the source seems to be a mysterious and invisible, a mysterious and invisible, undocumented option. sdhci.debug_quirks2=4 Whilst it is poorly documented, it isn't a super secret Pi specific option. It is an option for the Linux SDHCI driver to ena...
by ejolson
Thu May 21, 2020 10:36 pm
Forum: General discussion
Topic: dual boot on Pi 4
Replies: 13
Views: 4400

Re: dual boot on Pi 4

I would like to know if the following is possible on my Pi 4. I would like to install both Retropie and LibreELEC on my Pi4. I would like the Pi to boot and I would be able to select which OS to run. If I reboot from either OS it goes back to menu where I can select which OS. If I do this, I would ...
by ejolson
Thu May 21, 2020 10:09 pm
Forum: Networking and servers
Topic: iSCSI Root Like a Data Center
Replies: 26
Views: 1288

Re: iSCSI Root Like a Data Center

Okay, so nothing is working so far. As with the magical pipes of Cantus in Fraggle Rock the source seems to be a mysterious and invisible, a mysterious and invisible. A mysterious and invisible what? I don't know; it was so mysterious and invisible. Anyway, add sdhci.debug_quirks2=4 to cmdline.txt a...
by ejolson
Thu May 21, 2020 9:57 pm
Forum: Beginners
Topic: Boot Menu
Replies: 15
Views: 547

Re: Boot Menu

ejolson wrote:
Thu May 21, 2020 9:46 pm
I'm not having any luck with a 4B switching boot partitions, even after adding the suggested

Code: Select all

sdhci.debug.quirks2=4
to my cmdline.txt file.
Okay. I checked the PINN project and the above post had a typo. It should be

Code: Select all

sdhci.debug_quirks2=4
Note the additional underscore.
by ejolson
Thu May 21, 2020 9:46 pm
Forum: Beginners
Topic: Boot Menu
Replies: 15
Views: 547

Re: Boot Menu

I dont have Mouse&keyboard connected to my PI, Do you have a joystick or gamepad? PINN supports some models of those as well as keyboard, mouse & touchscreen. # systemctl reboot 3 I've never used that; I normally use: # sudo reboot n Maybe that has the same effect. In any case, this should work on ...
by ejolson
Thu May 21, 2020 8:49 pm
Forum: Beginners
Topic: Reboot [partition] doesn't work
Replies: 2
Views: 129

Re: Reboot [partition] doesn't work

I don't know. I just ran into this problem as well. It used to work, but not anymore. I suspect something has changed, but I don't see where it is documented. Edit: I found it. There is a mysterious option that needs to be added to cmdline.txt for this to work on the Raspberry Pi 4B. More informatio...
by ejolson
Thu May 21, 2020 7:13 pm
Forum: Raspberry Pi OS
Topic: Raspbian - use btrfs instead of ext4 ?
Replies: 7
Views: 349

Re: Raspbian - use btrfs instead of ext4 ?

See: https://www.raspberrypi.org/forums/viewtopic.php?t=188051 and https://www.raspberrypi.org/forums/viewtopic.php?f=66&t=273490 Much as I like the snapshot feature, it would appear that F2FS may be better in general for SD cards on the Pi. It should be pointed out, however, that BTRFS is also fla...
by ejolson
Thu May 21, 2020 6:03 pm
Forum: Troubleshooting
Topic: RPi4-4GB: How easy to blow up the USB chip?
Replies: 22
Views: 594

Re: RPi4-4GB: How easy to blow up the USB chip?

The horror scenario is: insert a USB3 device, works ok. insert another USB3 device, works ok. Insert a third USB3 device - Errors!! And then the RPi no longer does USB3. The earlier working USB3 devices are now only recongized as USB2 devices. This makes me believe that the third device (an SSD att...
by ejolson
Thu May 21, 2020 5:37 pm
Forum: Troubleshooting
Topic: RPi4-4GB: How easy to blow up the USB chip?
Replies: 22
Views: 594

Re: RPi4-4GB: How easy to blow up the USB chip?

Static? I think a USB port should be able to handle that. It is designed to be plugged in whatever. Static electricity is quite hard to fully protect against. Is it possible you have an earthing problem on the mains circuit in your home that makes damage for a small device like the Pi more likely? ...
by ejolson
Thu May 21, 2020 5:33 pm
Forum: Off topic discussion
Topic: What do you guys store your pi boards in when not in use?
Replies: 29
Views: 1411

Re: What do you guys store your pi boards in when not in use?

I suppose I should add this "storage" technique... Back before the Bay Area monthly Jam failed (the venue started wanting money), I would store between jams and transport to each Pi in a 1-gal. size Ziplock bag, together with all of it's small support parts: PSU, HDMI cable, mouse, monitor power ca...
by ejolson
Thu May 21, 2020 4:18 pm
Forum: Troubleshooting
Topic: RPi4-4GB: How easy to blow up the USB chip?
Replies: 22
Views: 594

Re: RPi4-4GB: How easy to blow up the USB chip?

A device that is not externally powered, like a USB stick. I burned out an entire PC motherboard doing something like that about 7 years ago. It was quite astonishing. I never really figured out what happened, but maybe it was static electricity or trying to insert the device upside down. With an n...
by ejolson
Thu May 21, 2020 6:03 am
Forum: Networking and servers
Topic: iSCSI Root Like a Data Center
Replies: 26
Views: 1288

Re: iSCSI Root Like a Data Center

I was zooming with the dog developer about this thread and an argument ensued whether that's a BBC Micro or an Apple II in the background of Sprocket's workshop. https://www.youtube.com/watch?v=CkeuLfuBVPI At any rate, starting at 7:25 one can hear the guiding principle followed here concerning root...
by ejolson
Thu May 21, 2020 1:40 am
Forum: Troubleshooting
Topic: Raspberry Pi 3B crashes
Replies: 5
Views: 185

Re: Raspberry Pi 3B crashes

The Pi 3B had stability problems when it first came out. One story is at https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=139712 For me that thread tells a sad secondary story in which many of the people who contributed to solving the problem no longer post or are members of this forum. From ...
by ejolson
Wed May 20, 2020 11:38 pm
Forum: Networking and servers
Topic: iSCSI Root Like a Data Center
Replies: 26
Views: 1288

Re: iSCSI Root Like a Data Center

Does anyone know what LUN 0 is about? LUN 0 is how the initiator interrogates the target to discover what other LUNs exist. That's clever to use the same protocol as a way to query the available targets. While interrogation got a bad name after the replacement of the Medieval Inquisition by the Inq...
by ejolson
Wed May 20, 2020 8:04 pm
Forum: Networking and servers
Topic: iSCSI Root Like a Data Center
Replies: 26
Views: 1288

Re: iSCSI Root Like a Data Center

While optimally a Raspberry Pi would be used as the server for the iSCSI target devices, typical data centers are more likely to use a fibre-channel iSCSI SAN storage controller such as the hip hop IBM Storwize V7000F. Another option might be a smaller NAS such as those marketed by QNAP or Synology....
by ejolson
Wed May 20, 2020 4:18 pm
Forum: General discussion
Topic: Get your Pi to fight COVID-19
Replies: 179
Views: 6770

Re: Get your Pi to fight COVID-19

I'm running Win10, mainly because I couldn't get Linux to install (Ubuntu --16.04 would run from USB, install to SSD, but the SSD was not recognised as bootable by UEFI. Later versions would not boot from USB -- 18.04 had USB errors, 20.04 display was mangled, so I don't know what else.) I have sol...
by ejolson
Wed May 20, 2020 4:28 am
Forum: General discussion
Topic: Get your Pi to fight COVID-19
Replies: 179
Views: 6770

Re: Get your Pi to fight COVID-19

OTOH, I've just set up a Ryzen Threadripper 3960X 24-Core 3.9GHz, which is fairly much cutting edge. A cutting edge GPU is 5-6 times more productive. I'm also impressed, for example, even with the first generation Threadripper CPUs such as the 12-core 1920X. Are you running Linux or a Microsoft ope...
by ejolson
Wed May 20, 2020 3:57 am
Forum: Networking and servers
Topic: iSCSI Root Like a Data Center
Replies: 26
Views: 1288

Re: iSCSI Root Like a Data Center

The next step is to get the /extra boot partition set up to use an initial RAM filesystem. A properly configured initial RAM filesystem will eventually be needed for network booting and it's easier to debug things one step at a time. Since we will be making all experimental changes, henceforth, to t...
by ejolson
Wed May 20, 2020 3:18 am
Forum: Networking and servers
Topic: iSCSI Root Like a Data Center
Replies: 26
Views: 1288

Re: iSCSI Root Like a Data Center

So far nothing has been accomplished with regards to the objective of network booting the Pi and then mounting root on an iSCSI block device. In a way all I'm doing in these first posts is describing a difficult way to install bog-standard Raspbian on an SD card and there is, indeed, still a long wa...

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