Over the past 30 years you have probably seen multiple articles on constant pressure water pump control valves (CPV). Every article talks about the "magic" of these simple mechanical valves, but rarely do they talk about the benefits of constant pressure during variable water demand for your entire water system.
Adding life to your pump is what CPV's are all about. Additionally, you have the benefits of longer life on all other well components such as pressure switch points and pressure tank bladders/diaphragms. This is due to a CPV limiting excessive cycling on your system.
The goal of these valves has always been to control the pump and keep it from cycling itself to an early death. Your customers enjoying constant pressure is icing on the cake.
Let's look at the most common myths about constant pressure water pump control valves:
Before we get into what Tailscale is or how it compares to a traditional remote access VPN, let’s take a quick look at Tailscale in action. The main problem Tailscale solves is remote access to your internal workloads.
In my homelab, I have a server running Linux. When I’m on my home network, I can access it directly without any issues. But if I step outside and want to access the same server over the Internet, Tailscale makes that much easier and you can have it up and running in about 10 minutes for free.
We Need to Talk About Jeffrey Goldberg Accidently Being Added to a National Security Chat – RedState
anon-l6yk
3 hours ago
My take is that this signal app was used extensively during the “Biden” administration and they created the original list of regular participants. How much do you want to bet that Goldberg was a regular participant in those classified briefings during the Biden years and this was a result of an incomplete purge of the unauthorized participants?
Rapid Response 47 @RapidResponse47
·
.@CIADirector: "One of the first things that happened when I was confirmed as CIA director was Signal was loaded onto my computer ... One of the things that I was briefed on very early was ... the use of Signal as a permissible work use — it is."
11:03 AM · Mar 25, 2025. //
RATCLIFFE: It is permissible to use to communicate and coordinate for work purposes, provided — provided, Senator — that any decisions that are made are also recorded through formal channels. So, those were procedures that were implemented — my staff implemented those processes, followed those processes, complied with those processes, and finally — just please — so, my communications, to be clear, in a Signal message group, were entirely permissible and lawful — and did not include classified information. //
As Bonchie rightly noted earlier, Goldberg's inclusion on the chat was an unforced error, and frankly, none of the administration should be in contact with him — ever — given his previous bad-faith reporting.
But as Ratcliffe's testimony clearly demonstrates, the use of the app itself by officials for non-classified communication and coordinating for work purposes is both allowed and legal — just as it was under the Biden administration. Hopefully, this will serve as a valuable lesson and help underscore the importance of mindfulness as to proper channels and participants when officials communicate with one another.
In typical applications, magnetic flow meters are sized so that the velocity at maximum flow is approximately 2-3 meters per second. Differential pressure constraints and/or process conditions may preclude application of this general guideline. //
For slurry service, be sure to size magnetic flow meters to operate above the velocity at which solids settle (typically 1 ft/sec), in order to avoid filling the pipe with solids that can affect the measurement and potentially stop flow. Magnetic flow meters for abrasive service are usually sized to operate at low velocity (typically below 3 ft/sec) to reduce wear. In abrasive slurry service, the flow meter should be operated above the velocity at which solids will settle, despite increased wear.
It’s hard to have a conversation with anyone in Washington these days without using Signal. I hate the app. It’s just one more messaging app that must be checked. Everyone in Washington, it seems, has Signal. Government officials use it. Reporters use it. Politicians on Capitol Hill use it. Hillary Clinton used an insecure email server. Everyone else just uses Signal, which, at least, is end-to-end encrypted.
With China thoroughly infiltrating our telecom system, no officials in DC are using built in phone messaging apps or voice to communicate important information now. Apple’s iMessage is robust and secure if the bubbles are blue. But someone may have their iCloud backup turned on, which would capture the chat. What’s App is fine and secure. But, again, someone might have a backup. Signal is secure and once a message is deleted, it is deleted. It is the preferred app.
For members of the Trump Administration, which last term saw rogue embedded progressives leaking classified information and even now has seen ICE raid information leak, bypassing government approved means of communications for Signal makes sense — the rogue bureaucrats provided the incentive.
But that is no excuse to add a reporter to a secure group chat trading information related to bombing the Houthis as the Trump national security team did. //
- This whole mess really does suggest that the Trump Administration, like the Biden Administration, has no clue how to get the Chinese out of our telecom networks.
It is unclear why the D.C. Circuit has allowed Dellinger’s Motion to Dismiss to linger, as opposed to denying it with a note reprimanding his attorneys to follow the controlling procedures for dismissing a case. But by failing to immediately nix Dellinger’s efforts to manipulate the court, we are now seeing other litigants, such as those in the Maryland case challenging the termination of DEI initiatives, trying similar tacks.
The appellate courts need to make clear to litigants that such jockeying will not work, and then they need to put an end to the outrageous preliminary injunctions. And if they refuse to do so, the Supreme Court needs to end its delusional view that it is maintaining the reputation of the judicial branch by allowing the normal process to play out in these politically charged cases—because there is nothing normal about the lower courts’ efforts to unconstitutionally control the Executive Branch.
China has said it will not honor the judgment. “The so-called lawsuit has no basis in fact, law or international precedence,” Chinese embassy spokesman Liu Pengyu told The New York Times. “China does not and will not accept it. If China’s interests are harmed, we will firmly take reciprocal countermeasures according to international law.”
China was not represented at the trial, resulting in a default judgment.
It's unclear why China is buying farmland in the United States. Granted real estate can be a valuable part of an investment portfolio, but China has ample land of their own. Interestingly, China is far from the largest foreign owner of American agricultural land; that largest foreign owner, as of 2021, would be Canada, followed by the Netherlands, Italy, the United Kingdom, and Germany. China's ownership, also as of 2021, is about 383,935 acres. It's likely, though, that the Canadian and other interests represent ownership by large agricultural business concerns, whereas China's purchases are disturbing due to some of the lands' proximity to important U.S. military installations. For example: Chinese interests have purchased 300 acres of land near Grand Forks Air Force Base, which is home to a B-1 Lancer wing, along with other assets.
Learn about sieve syntax and how recipes are set up. This article is not a comprehensive list of everything that sieve can do, but rather a guide to helping you get started with sieve. If you want more information about what sieve is, see our article What is Sieve Filtering?
sing the guide to build plugins for Roundcube, I set up a "no_forward_for_groupes" plugin, in the [roundcubeRoot]/plugin/no_forward_for_groupes folder. I activated it in the [roundcubeRoot]/config/config.inc.php file by wrtiting
$config['plugins'] = array('no_forward_for_groupes');as any other plugin.
After a bit of reading and research in the [roundcubeRoot]/program/js/app.js file (the core JS of Roundcube), I found the object I need to act with and the events to listen. The final code is just after. As you can see, I disabled a lot of other commands, as well as drag and drop. So basically I have a read-only folder, which you can't get any mails out of. I know it's kind of a specific use-case, but I hope it'll help some folks out there someday!
The following sections describe how to identify and resolve problems with your ZFS file systems or storage pools:
- Determining If Problems Exist in a ZFS Storage Pool
- Reviewing zpool status Output
- System Reporting of ZFS Error Messages
ZFS automatically logs successful zfs and zpool commands that modify pool state information. This information can be displayed by using the zpool history command.
How about using FreeBSD as an Enterprise Storage solution on real hardware? This where FreeBSD shines with all its storage features ZFS included.
Today I will show you how I have built so called Enterprise Storage based on FreeBSD system along with more then 1 PB (Petabyte) of raw capacity. //
There are 4U servers with 90-100 3.5″ drive slots which will allow you to pack 1260-1400 Terabytes of data (with 14 TB drives). Examples of such systems are:
I would use the first one – the TYAN FA100 for short name.
The build has following specifications.
2 x 10-Core Intel Xeon Silver 4114 CPU @ 2.20GHz
4 x 32 GB RAM DDR4 (128 GB Total)
2 x Intel SSD DC S3500 240 GB (System)
90 x Toshiba HDD MN07ACA12TE 12 TB (Data)
2 x Broadcom SAS3008 Controller
2 x Intel X710 DA-2 10GE Card
2 x Power Supply
Price of the whole system is about $65 000 – drives included.
The Road to RAID-Z Expansion
Expanding storage capacity has long been a challenge for RAID-Z users. Traditionally, increasing the size of a RAID-Z pool required adding an entirely new RAID-Z vdev, often doubling the number of disks—an impractical solution for smaller storage pools with limited expansion options.
To address this, the FreeBSD Foundation funded the development of RAID-Z expansion, making it both practical and easy to implement. Led by Matt Ahrens, a ZFS co-creator, the feature underwent years of rigorous testing and refinement. Although the pandemic caused some delays, the project was feature complete in 2022. Additional integration steps followed, and the feature is now generally available in the OpenZFS.
Thank You for Your Support
After years of development, industry collaboration, infrastructure testing, and nearly $100,000 investment, we are so excited to see RAID-Z expansion in the recent release of OpenZFS 2.3. We’re also grateful to iXsystems for their efforts in finalizing and integrating this feature into OpenZFS.
This marks a significant milestone in the evolution of the ZFS filesystem and reinforces its position as a cutting-edge open source filesystem for modern storage use cases.
This development work happened because of your donations to the FreeBSD Foundation. We couldn’t have made this financial commitment without your help. Thank you to all our supporters, large and small.
Geerling’s experiment underscores a humorous yet insightful reality: while pigeons can outperform fiber optics in specific, limited scenarios, the internet remains the superior choice for large-scale and long-distance data transmission. As data volumes continue to grow exponentially—reaching into the petabit range—the efficiency and scalability of fiber and other digital technologies are indispensable.
Unlike the months and years handed down in sentences to people who merely entered the Capitol, I'd be shocked if any of this results in more than a stern talking to by some Obama or Biden appointee on the DC bench. Nevertheless, the proceedings will probably provide sufficient cause to terminate the whole lot, and that counts for something.
The Republicans may have complete control of Congress, but President Trump still has a major roadblock to carrying out his agenda — the courts.
The lower courts blocked more of Trump’s executive orders in his first two months of office than they did for other recent commanders in chief during their entire terms.
The lower courts have slapped at least 15 national injunctions against Trump so far this year.
That drastically outpaces the six against former President George W. Bush during his entire presidency and the 12 against former President Barack Obama and the 14 against former President Joe Biden for their whole time in office, too, according to a tally from Harvard Law Review.
Stephen Miller @StephenM
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It takes 5 Supreme Court justices to issue a ruling that affects the whole nation. Yet lone District Court judges assume the authority to unilaterally dictate the policies of the entire executive branch of government.
Benjamin Weingarten @bhweingarten
Replying to @EricTeetsel
There’s a credible case to be made that any one of around 700 district court judges possesses more power than any one Supreme Court justice, given the unilateral power to issue a universal injunction
8:34 AM · Mar 20, 2025. //
How it works: Lawsuits against the federal government start in a district court — there are more than 600 district-court judges — then can move to an appeals court, then the Supreme Court.
In the old days, district courts' rulings only applied to the parties before them. But since the beginning of the Obama administration, those judges have become increasingly willing to say their rulings apply nationwide — the same scope a Supreme Court decision has. //
I’m open-minded enough to consider that some of these rulings are in fact fair, but the sheer number of them—especially compared with historical precedent—is simply impossible to ignore.
And deeply troubling.
Why should passengers not delay donning emergency oxygen masks after they deploy from the overhead compartments?
A
As soon as the oxygen masks fall down, the flight crew will know, and they will make it an immediate priority to get the aircraft down to an altitude where the masks are not needed anymore because the outside pressure is high enough to breathe by. This takes less than the time the oxygen generators last for.
(Usually descending will take much less time than the masks are good for -- the critical design factor for the oxygen mask duration is that if you happen to be over tall mountains when the pressure drops you may need to fly for a bit of time to reach terrain low enough to dispense with the masks. There are a few places, such as over the Tibetan plateau, where airline flights simply don't go because it's too far from sufficiently low terrain for the masks to last).
There is no realistic chance of the oxygen generators running dry while you still need them. If you delay putting your mask on, all you buy is a danger of fainting or otherwise being unable to don it (from low pressure, not depletion of oxygen in the air) before you decide to put it on -- and then you may end up in a low-oxygen state for long enough to risk permanent harm.
There's a reason why the safety briefing always instructs you to put your own mask on before helping others -- because the time it takes to help someone else may well be enough to incapacitate yourself. //
In a typical decompression, there will be a gradual loss of pressure. However, by the time the masks drop, the pressure has already dropped a fair amount. There is no set time that it takes for pressure to drop. It could be very gradual, or it could be explosive decompression that happens extremely quickly. As a passenger, aside from the obvious explosive decompression, you will not be able to tell how fast the pressure is dropping. And because of how hypoxia works, you many not even be able to tell that you are not getting enough oxygen. So you have no way to tell how long you can safely wait before putting on your mask. Without enough oxygen, you eventually die.
So by not putting on the mask, you are risking death. What is the benefit of waiting to put on your mask?
Airlines operating under FAA regulations are required to carry certain amounts of oxygen, depending on the flight. FAR 121.333 covers the requirements for oxygen supply during an emergency descent.
For airliners certified to FL250 and below, they must carry 30 minutes of oxygen for 10 percent of passengers, but only if they can safely descend to 14,000 feet in 4 minutes.
If they cannot safely descend, or if the airplane is certified above FL250 (as most airliners are), there must be at least 10 minutes of oxygen for all passengers, and enough for 10 percent of passengers for the duration of flight with cabin altitude between 10,000 and 14,000 feet. //
At high altitude, the time for useful consciousness is measured in seconds. Pilots are trained to take on the mask immediately when the alarm goes off.
The problem of your approach lies in two uncertainties:
Uncertainty of cabin pressure. Unless you happen to have carried a altimeter with you, of course.
Uncertainty of the oxygen level in your blood. Prolonged hypoxia may cause permanent brain damage.
For your reference, the time of useful consciousness at FL350 is 30 seconds only. If it was a rapid decompression, then the fog which formed instantaneously may have obscured your vision for a good 10 seconds. Granted, at FL150 you'd have 30 minutes. But you wouldn't know. And most passengers simply wouldn't have known the aircraft's attitude the moment it happens. It is simply too risky (for both pilots and passengers) to wait while oxygen supply is available. //
it's important to understand that 100% oxygen at 11 km is possible because pressure is still 22 kPa, greater than the physiological minimum of 16 kPa. If it was below 16 kPa (e.g. at 13 km), even if this 100% O2 supply was in excess for our body needs, it wouldn't be transferred to our blood without increasing its partial pressure to 16 kPa, either by providing more oxygen, or adding another gas to the same quantity of oxygen. Hence at 13 km a pressurized mask would be necessary.
–
mins Commented Dec 27, 2016 at 2:23
@mins, yes, above certain altitude even 100% O₂ won't help, but adding other gasses won't change anything, because what matter is that partial pressure of oxygen is at least ~14 kPa (You need 11.6 kPa more O₂ than CO₂ to displace the later from the hemoglobin, plus a bit more for the process to be sufficiently efficient. Exhaled air has around 14.5% of oxygen and that is still plenty for mouth-to-mouth resuscitation.). Total pressure only matters to prevent excessive drying above the Armstrong limit, that pressure is 6.8 kPa (18–19 km; then you need full pressure suit).
– Jan Hudec Commented Dec 27, 2016 at 11:10
ZFS is the last word in the filesystem period. Many administrators are confused about using it – because ZFS is more than a filesystem. It introduces many new concepts. This blog’s mission is to bring ZFS to more homes/companies and show that we don’t need any other filesystem.
The ZedFS gathers information and tutorials about ZFS. If you are curious about ZFS, this website will become your home.
Ok, but why ZedFS?
There is an endless discussion if we should pronounce ZFS as ZeeFS or ZedFS. The debate is so hot that even Michael W Lucas and Allan Jude (the authors of the FreeBSD Mastery: Advanced ZFS) disagreed on how we should pronounce ZFS. Because of that, there is a Canadian version of the “ZedFS FreeBSD Mastery.” (The story of the book). If you are from the ZeeFS camp, then ‘ed’ in the blog’s name is from EDucation.
In traditional file systems we use df(1) to determine free space on partitions. We can also use du(1) to count the size of the files in the directory. But it’s different on ZFS and this is the most confusing thing EVER. I always forget which tool reports what disk space usage! Every time somebody asks me, I need to google it. For this reason I decided to document it here – for myself – because if I can’t remember it at least I will not need to google it, as it will be on my blog, but maybe you will also benefit from this blog post if you have the same problem or you are starting your journey with ZFS.