However the 12 Gbps SAS SSD were returning Checksum errors in ZFS when I did copy information or I ran scrub. I’m afraid the enclosure can only provide 6 Gbps at max, or a poor connection. Cables or expanders use to be the reason. I ordered new cables to make a direct connection to the HBA Controller without the enclosure to validate my theory and the drives stopped showing errors.
There is something good in all bad: I have been able to document and explain how to troubleshoot, actual errors in ZFS, in my book and talk about the problems with the cables, and the advantages of using a SAS controller even if you use SATA drives.
I got my first Excellent in an Assignment in an Ireland university, which makes me specially happy. And I keep going on studying in Linux Academy, the last course I did was GCP and Terraform, even if I knew both it helps me to keep my skills sharp.
I share with you some offers and charity bundles that I enrolled and enjoyed a lot:
There is an offer with Microsoft Pass which is that we can use Disney+ for free during 30 days.
I started watching the Mandalorian, Season 2, and is wonderfully displayed in 4K. The quality of the video surprised me. Not that many contents in Netflix are 4K and I really enjoyed the great quality of the image.
Humble Bundle offers a pack of 8 VR games per €13.45. If you like Virtual Reality and have your headset, this pack is amazing, and the benefits go to charity: Movember. The games are downloaded from Steam and the pack will last for 14 days.
This article talks about how at Riot Games they use Slack. Slack is really a powerful tool, and also makes the communication more human in companies with their approach and the funny icons and /giphy. I’m very serious when it comes to work but I recognize the friendly, warm, human and lovely touch these kind of animated icons bring to the conversations.
I updated it the Nov-01, as I normally do, bringing more content.
I’ve been paid the royalties for he past two months and I reinvested everything (and more from my pocket) in Hardware for working with ZFS.
I was offered by an editorial in The States to publish Python Combat Guide and other of my books worldwide. I was thinking it for a while. It was very good money, translation to multiple languages and platforms and marketing and a lot of promotion, but I would had loss the rights and the Freedom I have now, like the possibility to offer discount coupons to who I want and to update the contents often. So to celebrate my decision for you, readers of the blog, during September, I provide a discounted price of $5 USD for the fist 100 sales instead of the $25 USD suggested price. Use the following link:
As part of my effort to contributing with nice Open Source products to the Community I have made some investments to keep contributing to:
My old tool for managing ZFS and Network shares easily
I’m writing a new book about managing ZFS for Small Business too, so I show how to operate on this hardware, good points and downsides.
I’m assembling a new Pc with ZFS plenty of Disk Storage within a mix of:
SAS Enterprise grade SSD 2.5″
SATA 12Gb Enterprise grade SSD 2.5″
SATA SSD 2.5″
SATA HDD 2TB 2.5″
SATA HDD 2TB 3.5″
I’m a big fan of Intel, but this time I have chosen AMD. Concretely a AMD Ryzen 7 3700X AM4 8 Core / 16 Threads, 3.6 GHz to 4.4 GHz with Turbo. The reason I chose this CPU is because it only uses 65W but still has 8 Cores / 16 Threads.
Also I want to see the performance of this AMD Ryzen with CMIPS and another important reason is that AMD motherboards support PCI 4.0. I have bought a NVMe SSD Samsung 980 PRO PCI 4.0 (x4) able to read at 6,400 MB/s. I will use this AMD box for running VMs as well. Basically Virtual Box and Docker.
I’ve been surprised that for 169.99 GBP I can have a very good Asus Motherboard with a 2.5 Gb Ethernet: ASUS ROG STRIX B550-F GAMING, AMD B550, AM4, DDR4, PCIe 4.0, SATA3, Dual M.2, CrossFire, 2.5GbE, USB 3.2 Gen2 A+C, ATX.
In order to have an Asus motherboard with a 2.5 Gb Ethernet for Intel I had to jump to a 254 GBP motherboard and Intel is still PCI 3.0. Actually there are PCI 10Gb NICs at 80 GBP so at some point I’ll upgrade my home network from Gigabit to 10 Gb. That will come slowly, but if the new equipment I assemble has 2.5 Gb when I upgrade the main switches to 10 Gb, at least I’ll be able to communicate at 2.5 Gb without ant additional change.
Also memory at 3200, speed that the AMD motherboard can provide, is more than affordable.
This new server will have 64 GB of RAM (Corsair DDR4 Vengeance PC4-25600 (3200)), as I plan to run VMs and use Volumes mounted via iSCSI and locally as block devices to improve my Software. I’ve bought a new UPS to keep it running in case power goes down. That’s something that doesn’t happen often in my city in Ireland, honestly, but I never forget that this happens in Barcelona two or three times per year, and that a high tension spike can burn your motherboard, drives, or electronics like the TV or the fridge. I’ve bought as well a new KVM Switch, a HDMI 4K and USB too one, so I don’t have to have so many keyboards. My logitech M720 allowed me to use it with 3 computers, but still I want something more operational. The KVM I bought allow me to switch with a button or within a hotkey in the keyboard.
I bought a new Icy box fox handling 6 2.5 drives in just one bay of the tower, and a 850 Watt Corsair PSU that will be able to power the many drives I want at the same time.
I contribute a lot to Open Source, and many years ago before Open Source existed I was creating Freeware Software. But I think that good commercial Software deserves to be supported. Like everything in life, if they are doing a good work that is useful to me, why not giving them support?. It is also a way to make sure they will continue producing amazing Software. And in the other hand, myself, I create Software. Some times commercial Software, and I like to be paid, so I apply the same principle.
One of my colleagues showed me dstat, a very nice tool for system monitoring, and bandwidth of a drive monitoring. Also ifstat, as complement to iftop is very cool for Network too. This functionality is also available in CTOP.py
As I shared in the past news of the blog, I’m resuming my contributions to ZFS Community.
Long time ago I created some ZFS tools that I want to share soon as Open Source.
I equipped myself with the proper Hardware to test on SAS and SATA:
12G Internal PCI-E SAS/SATA HBA RAID Controller Card, Broadcom’s SAS 3008, compatible for SAS 9300-8I. This is just an HDA (Host Data Adapter), it doesn’t support RAID. Only connects up to 8 drives or 1024 through expander, to my computer. It has a bandwidth of 9,600 MB/s which guarantees me that I’ll be able to add 12 SAS SSD Enterprise grade at almost the max speed of the drives. Those drives perform at 900 MB/s so if I’m using all of them at the same time, like if I have a pool of 8 + 3 and I rebuild a broken drive or I just push Data, I would be using 12×900 = 10,800 MB/s. Close. Fair enough.
VANDESAIL Mini-SAS Cables, 1m Internal Mini-SAS to 4x SAS SATA Forward Breakout Cable Hard Drive Data Transfer Cable (SAS Cable).
SilverStone SST-FS212B – Aluminium Trayless Hot Swap Mobile Rack Backplane / Internal Hard Drive Enclosure for 12x 2.5 Inch SAS/SATA HDD or SSD, fit in any 3x 5.25 Inch Drive Bay, with Fan and Lock, black
Terminator is here. I ordered this T-800 head a while ago and finally arrived.
Finally I will have my empty USB keys located and protected. ;)
I have benchmarked three different CPUs and two Compute optimized Amazon AWS instances with CMIPS 1.0.5 64bit. The two Intel Xeon baremetals equip 2 x Intel Xeon Processor and the third baremetal equips a single Intel Core i7-7800X:
If you’re surprised by the number of cores reported by the Amazon instance m5d.24xlarge, and even more for the baremetal c5n.metal, you’re guessing well that this comes from having Servers with 4 CPUs for Compute Optimized series.
When I can choose I use Linux, but in many companies I work with Windows workstations. I’ve published a list of useful Software I use in all my Windows workstations.
WFH I currently use two external monitors attached to the laptop. I planned to add a new one using a Display Port connected to the Dell USB-C dongle that provides me Ethernet and one additional HDMI as well. I got the cable from Amazon but unfortunately something is not working. In order to make myself comfortable and see some the graphs of the systems worldwide as I have on the office’s displays, I created a small HTML page, that joins several monitor pages in one single web page using frames. This way I only have one page loaded on the browser, maximized, and this monitor is dedicated to those graphs of the stats of the Systems. Something very simple, but very useful. You can extend the number of columns and rows it to have more graphics in the same screen.
If you don’t have the space or the resources for more monitors you can use the ingenious.
I have a cheap HDMI switch that allows me to do PinP (Picture in Picture) with one main source on the monitor, and two using a fraction of their original space. It may allow you to see variants in graphics.
And in you have only a single monitor, you can use a chrome extension that rotates tabs, which is also very useful.
Be careful if you use the reload features with software like Jira or Confluence. If they are slow normally, imagine if you mess it by reloading every 30 seconds… I discourage you to use auto refresh on these kind of Softwares.
This past week I have connected the XBOX One X Controller to the Windows laptop for the first time. Normally I use the Pc only for strategy games, but I wanted to play other games like Lost Planet 3, or Fall Guys in a console mode way. I figured that would be very easy and it was. You turn on the controller, press the connect button like you did to pair with the console, and in Windows indicate pair to a Xbox One controller. That’s it.
I’ve also updated my Python 3 Combat Guide, to add the explanation, step by step, about how to refactor and make resilient, and add Unit Testing to a spaghetti code, and turn it into a modern OOP. Is currently 255 DIN-A4 pages.
This is something I wanted to share with you for a while. One of the most funny things in my career is what I call: Squirrel Strikes Back
I named this as the first incident where a provider told that the reason of a fiber failure was a squirrel chewing the cable.
I popularized this with my friends in Systems Administration and SRE and when they suffer a Squirrel Attack incident, they forward it to me, for great joy.
I’m used to construction or gas, water, electricity, highways repair operations on the cities accidentally cutting fiber cables, thunders or truck accidents on the highway breaking the floor and cutting tubes and issues like that. I’ve been seeing that for around 25 years.
So the first time I saw a provider referring to a squirrel cutting the cables it was pretty hilarious. :)
In my funny mental picture: I could visually imagine a cable thrown in the middle of the forest, over trees, and a squirrel chewing it as it tastes like peanuts. :) or a shark cutting a Google’s or Facebook’s intercontinental cable thrown without any protection. ;)
The sense of humor and the good vibes, are two of the most important things in life.
I tried to continue following it since I left Sanmina. ZFS is really an amazing Software and it’s lead by an amazing Community of super cool Engineers and companies. I would like to continue contributing ASAP.
I bought some new hard drives in order to work a bit on this. You don’t need to have dedicated hardware if you want to test features. You can run in a VirtualBox or VMWare Workstation.
I received more books about DevOps and Python
None is perfect. I see flaws in all of them and bad architecture practices*, however from all I learn interesting things.
You know, I study every day. At least 30 minutes, after work. As part of my healthy routines.
But I also study and learn during the work, as we have time available for this.
I’m very fortunate that Blizzard gives me time every day to study. That’s amazing. They also send us to events paying the ticket, travel, hotel, expenses… now with covid-19 we only go to virtual events, but the company still pay for this and give free days. Is a very nice company.
I continue having purchases of my book, and I’m very happy about that. I’m working on improving it and providing more contents and samples going from the scratch, with step by step code samples. From spaghetti code reading CSV files, to OOP with Full Coverage.
My application for a Higher degree Computer Science Cloud Computing (Level 8) has been accepted. The Irish government pays me 90% of the degree, and Blizzard will pay me the other 10% after I pass the first year course.
I’m really grateful to this beautiful country, Ireland.
Having an Irish degree is something that brings me an special illusion.
I have updated CTOP.py with some interesting features
It allows to pass a fixed width and height for the terminal render. That’s very useful when you run CTOP in a Docker non interactive session, or from a Cron, with the –iterations=1 so the output can be captured programmatically.
Jetbrains has provided me with a Free License of all their products, in order to support my work in Open Source projects. That’s very nice. I’m using now mainly PyCharm and PhpStorm.
At the beginning of the covid-19 I wrote a simulator in Python. That’s why I was able to anticipate that the number of cases and deaths would be very much higher when nobody around me knew what was going to happen. My first simulations were simple, and the algorithms were growing in complexity until I had a full rich Object Oriented modeler. Maybe I’ll write an article about this someday.
After doing a Masterclass to some colleagues about Refactor, Code Reliability, Quality, The non-happy path and Unit Testing, I’m preparing some contents that I’ll publish to the Community soon. So far I created this repo, where I added the source code for lesson 0: starting to program in Python videos that I created few months ago to help beginners.
I also added some contents to lesson 1, where we refactor pure spaghetti code with no error control, to something more elaborated with unit testing and full code coverage. Still procedural, but I will jump to next class in two weeks, where we will move to OOP and Dependency Injection.
After some work reviewing it and ensuring it has the expected quality, I finally published my book Python Combat Guide.
Is an atypical creation. Is more a Master Class to my best friend, it could be a SDM, TL leading a small Software Development department, a Coder or a Scientist wanting to join IT as programmer and to learn a lot of stuff very quickly, than rather a formal Python Book for learning. Absolutely is not for beginners.
If you want to buy it, to explore the TOC, extended description…
2020-03-06 Heya, I’m doing a set of improvements to the blog.
One, you can already see. I added a new section to the CSS @media, so now screens bigger than 1,800 px in width, will use that width for rendering the page. The original WordPress theme at 960x was too small for our current screens. I will add a new CSS @media for 4K screens promptly.
Other is about the organization of the content. I want to separate a bit the contents, now articles are sequential and is difficult to discover nice contents if they have 2 or more articles more recent, so I will group articles by content and provide a small index on the top page. Also I will provide more areas for Operations, SRE, where it will be easy to locate code, scripts, tricks… things that are useful to our day to day. I also want to make visible the articles about living in different cities, for IT Engineers, with useful tricks and tips. And keep the more complex and more interesting Engineering matters in the main page.
2020-03-13 15:49 Added SSL to the blog
With more delay I wanted, I bought a SSL certificate, configured Apache, and after few changes to the blog has been set. One very annoying is that WordPress linked the images statically pointing to http://blog.carlesmateo.com so I changed the latest article’s images to point to relative path so they will work nice with http or https.
My reflection is that everything negative can have its positive output. With this coronavirus thing, I decided to focus into improving things. And so I’m doing. :)