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by ejolson
Tue May 19, 2020 11:37 pm
Forum: Networking and servers
Topic: iSCSI Root Like a Data Center
Replies: 26
Views: 1260

iSCSI Root Like a Data Center

Even if not counterfeit, the least reliable component of the Raspberry Pi is frequently the SD card. While a broken SD card is user-replaceable, using an iSCSI network block device for the root file system in addition to reliability allows easy backup, check pointing and re-imaging the OS on demand....
by ejolson
Tue May 19, 2020 5:34 am
Forum: Advanced users
Topic: To Forum Moderator: mahjongg
Replies: 22
Views: 830

Re: To Forum Moderator: mahjongg

Could the same technique be used to enlarge a boot partition that was made too small the first time around? @ejolson, Give this a try (on a copy, not the original, just in case). This should put the BOOT partition at sector 2048 and the ROOT partition at sector 526336, resulting in a BOOT partition...
by ejolson
Tue May 19, 2020 1:57 am
Forum: C/C++
Topic: C Language
Replies: 20
Views: 996

Re: C Language

Someone keeps creating new encryption algorithms, otherwise we wouldn't all be doing the salsa and chacha these days. The problem is that a primary requirement of an encryption system is that it is secure, the encryption cannot be cracked, it cannot be bypassed/subverted by other means. What do you...
by ejolson
Tue May 19, 2020 1:24 am
Forum: C/C++
Topic: C Language
Replies: 20
Views: 996

Re: C Language

The attacker does not know the key and number of the round. Your program would have the decryption key and the algorithm used inside. You can obfuscate it but a sufficiently determined attacker would still be able to extract it. Creating your own crypto algorithm is still a terrible idea. The last ...
by ejolson
Mon May 18, 2020 11:41 pm
Forum: Advanced users
Topic: 160 Watt 4 ohm speaker with pi zero
Replies: 20
Views: 573

Re: 160 Watt 4 ohm speaker with pi zero

Thank you! Do you have any recommendation of which amplifier? I know I needed one but the thing is that all that seems for the rpi are just for 1-3 watts. I am not sure how to use others, same with the DAC. I don't really need to be that loudly but since I have the speaker already I would like to u...
by ejolson
Mon May 18, 2020 6:53 pm
Forum: C/C++
Topic: C Language
Replies: 20
Views: 996

Re: C Language

Also, never create your own encryption algorithm if you want to actually protect something valuable. It is extremely difficult to design one that is secure and homebrew algorithms are virtually certain to have major flaws. Someone keeps creating new encryption algorithms, otherwise we wouldn't all ...
by ejolson
Mon May 18, 2020 6:19 pm
Forum: General discussion
Topic: First "REAL" RPi Rack
Replies: 39
Views: 29160

Re: First "REAL" RPi Rack

im interested to buy this rack, do you sell them? Perhaps https://bitscope.com/product/blade/?p=about The original post fits 70 Pi computers in 3U while the products currently for sale on the Bitscope shopping page only fit 20 in 7U. Bitscope has clearly created higher density solutions. It appears...
by ejolson
Mon May 18, 2020 3:48 pm
Forum: General discussion
Topic: Get your Pi to fight COVID-19
Replies: 179
Views: 6722

Re: Get your Pi to fight COVID-19

mob-i-l wrote:
Mon May 18, 2020 2:32 pm
I can use my Raspberry Pi with Raspbian Buster to monitor [email protected] on my Windows 10 computer.
Would it be possible to run Folding at Home using x86 emulation on a Pi? Is qemu the obvious choice? Has anyone tried this? How's the performance?
by ejolson
Mon May 18, 2020 3:28 pm
Forum: General discussion
Topic: First "REAL" RPi Rack
Replies: 39
Views: 29160

Re: First "REAL" RPi Rack

im interested to buy this rack, do you sell them? Unfortunately, it's kind of an old post and the person who made the original does not seem to be selling. Hopefully they will respond, because I think there is a great opportunity with the 4B because of the gigabit network and faster CPUs. At the sa...
by ejolson
Mon May 18, 2020 6:39 am
Forum: For sale
Topic: RPIServers to try out!
Replies: 35
Views: 2120

Re: RPIServers to try out!

1Amp is referring to peak usage. However it is not hard limited to 1Amp. Only time it gets hard limits (breaker) is when you get to 15Amps and above. Thanks. Since a Pi consumes around 8 watts under load, then at those rates a single Pi could cost 8/120*15=$1/month just for the electricity. That ma...
by ejolson
Mon May 18, 2020 6:23 am
Forum: For sale
Topic: RPIServers to try out!
Replies: 35
Views: 2120

Re: RPIServers to try out!

Actually if you check out the site https://aliendata.com. My rackspace is only $10 per U. The price of $10 per U per month seems very good and makes the Pi cloud much more practical. Do you know how much power and bandwidth comes with that? So the power/connection/rackspace is all configurable. If ...
by ejolson
Mon May 18, 2020 3:47 am
Forum: General discussion
Topic: libfreerdp-dev replacement? RDP support with freeRDP2 on Buster
Replies: 2
Views: 85

Re: libfreerdp-dev replacement? RDP support with freeRDP2 on Buster

Hi all, I'm trying to compile guacamole 0.9.14 with RDP support on buster and in all the threads in the forum and on the Internet I read that libfreerdp-dev must be installed. Unfortunately I don't seem to find such a package in buster's repositories. Also I read that FreeRDP 1.x is no longer suppo...
by ejolson
Mon May 18, 2020 3:41 am
Forum: For sale
Topic: RPIServers to try out!
Replies: 35
Views: 2120

Re: RPIServers to try out!

demonmaestro wrote:
Sun May 17, 2020 2:15 am
Actually if you check out the site https://aliendata.com. My rackspace is only $10 per U.
The price of $10 per U per month seems very good and makes the Pi cloud much more practical. Do you know how much power and bandwidth comes with that?
by ejolson
Mon May 18, 2020 1:42 am
Forum: Advanced users
Topic: To Forum Moderator: mahjongg
Replies: 22
Views: 830

Re: To Forum Moderator: mahjongg

Do you move the root partition to the end of the disk to make room for boot at the beginning or simply put the boot after the root partition? I don't know about the beta bootloader for the Raspberry Pi 4, but on previous Raspberry Pi's, the BOOT partition must be the first partition (apparent'y the...
by ejolson
Mon May 18, 2020 1:28 am
Forum: General discussion
Topic: Running Zoom video conferencing client on the Pi
Replies: 73
Views: 40865

Re: Running Zoom video conferencing client on the Pi

They informed me that the developers are all working on the security side. :evil: They've got a lot of ground to cover between advertising end to end encryption that wasn't end to end and accidentally routing all meetings taking place in Taiwan through servers in mainland China. My suspicion is tha...
by ejolson
Mon May 18, 2020 1:10 am
Forum: Advanced users
Topic: To Forum Moderator: mahjongg
Replies: 22
Views: 830

Re: To Forum Moderator: mahjongg

Are your scripts on GitHub somewhere? Not at the moment. I have a GitHub account, but I've had a habit of posting things here on the Raspberry Pi forum. Do you move the root partition to the end of the disk to make room for boot at the beginning or simply put the boot after the root partition?
by ejolson
Mon May 18, 2020 12:24 am
Forum: Advanced users
Topic: To Forum Moderator: mahjongg
Replies: 22
Views: 830

Re: To Forum Moderator: mahjongg

to quote W. H. Heydt Aren't you getting a bit ahead of yourself? I don't believe so. I was hoping to head off the avalanche of 'Why doesn't my hybrid boot USB device work without an SD card after I updated the bootloader and Raspbian files? Please help me!'. Are your scripts on GitHub somewhere?
by ejolson
Sun May 17, 2020 8:39 pm
Forum: General discussion
Topic: Don't forget to secure your Pi clusters.
Replies: 4
Views: 345

Re: Don't forget to secure your Pi clusters.

I guess Pi Clusters have users too. It's nice to imagine how disappointed the perpetrators would be to find that juicy HPC system they have been mining on all week turns out to be only a half dozen Pi Zeros. I don't see why the perpetrators would be disappointed. According to Fido raspberry cluster...
by ejolson
Sun May 17, 2020 8:09 pm
Forum: General discussion
Topic: Get your Pi to fight COVID-19
Replies: 179
Views: 6722

Re: Get your Pi to fight COVID-19

So I dug out a 5 year old industrial PC to fire up in the name of fighting COVID-19. I found an amusing graph under View -> Statistics in boincmgr that shows how much faster total points were accumulating with the buggy client that was getting timeouts when waiting for Rosetta to finish. . boinctot...
by ejolson
Sun May 17, 2020 7:41 pm
Forum: General discussion
Topic: Get your Pi to fight COVID-19
Replies: 179
Views: 6722

Re: Get your Pi to fight COVID-19

On my Jetson I sometimes see the notifications button flashing at me in boincmgr. But when I click on it a get a new box open up with only a blank white content. Following the advice on the GitHub report, I switched boincmgr to Advanced View and then selected Preferences and immediately got . prefe...
by ejolson
Sun May 17, 2020 5:05 pm
Forum: General discussion
Topic: Get your Pi to fight COVID-19
Replies: 179
Views: 6722

Re: Get your Pi to fight COVID-19

My BOINC - Computing preferences: https://pbs.twimg.com/media/EYOV_GDWAAgF4GX?format=png&name=900x900 I use BOINC Manager (boincmgr) from Raspbian Buster. Thanks! Now I know what the layout is supposed to look like makes it easier to check whether it's simply white on white lettering. It seems othe...
by ejolson
Sun May 17, 2020 4:07 pm
Forum: General discussion
Topic: Don't forget to secure your Pi clusters.
Replies: 4
Views: 345

Re: Don't forget to secure your Pi clusters.

That's not really a secure you clusters problem, it's an insecure users one. The article makes it sound like a focused effort to disrupt research on coronavirus. What rogue state would do that and why? Alternatively, the call for projects gave access to a number of scientists who recently jumped on...
by ejolson
Sun May 17, 2020 6:05 am
Forum: For sale
Topic: RPIServers to try out!
Replies: 35
Views: 2120

Re: RPIServers to try out!

Hmm 24 RPIs. using what kind of racking were you looking at? I would like to know. I measured a longish 2U server chassis and decided there was space to fit two rows of 12 Pi 4B computers standing on edge along with a suitable power supply, a desktop 24 port switch and some hard disks. I had though...
by ejolson
Sun May 17, 2020 5:48 am
Forum: General discussion
Topic: Get your Pi to fight COVID-19
Replies: 179
Views: 6722

Re: Get your Pi to fight COVID-19

a broken monitor seems like a small loss Does that make your monitor the first non-human COVID-19 victim in your area? :o I checked this morning and that monitor really is dead. Unfortunately, the human losses have been much more terrible. I now have xorgxrdp running. I noticed The xauth cookies fo...
by ejolson
Sun May 17, 2020 2:02 am
Forum: For sale
Topic: RPIServers to try out!
Replies: 35
Views: 2120

Re: RPIServers to try out!

I agree with the network booting. I am testing that out to see how well it goes. I've been thinking about general viability of providing single-tenant Pi 4B servers as you are doing and understood Typical 2U colocation is at least US $60 per month. It is possible to squeeze 24 Pi's, a switch, power...

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