Leveraging its proprietary Assured family of storage solutions, Dot Hill solves many of today’s most challenging storage problems – helping IT to improve performance,increase availability, simplify operations, and reduce costs. Dot Hill’s solutions combine breakthrough software with the industry’s most flexible and extensive hardware platform and automated management to deliver best-in.
“We’d try to get the FPGAs into the lab as quick as we could and just find the problems there. With an ASIC, the goal is to find problems in simulation before you build the chip. This required a lot more thorough verification than the company has ever done before.”
Mike Peters, Dot Hill design engineer
The Problem: Starting with an FPGA prototype and a long history with FPGAs, Dot Hill sought to design and verify a new 30-million gate ASIC-based RAID accelerator using advanced OVM-based verification.
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The Solution: First, Dot Hill engineers tested individual ASIC modules and then moved to the full chip testbench. Next, the team used OVM to abstract verification tasks so the same tests could be run on the prototype FPGA and final ASIC designs. Finally, they used Questa Codelink to debug and test software that would eventually run on the two ARM processors and to perform software-driven verification of certain hardware components, including an internal ROM that contained boot code.
The Results: Details of the various tools aside, ultimately the key question is whether the new approach worked and how things were different compared to earlier FPGA-based accelerators built and verified by the team. Consider that within two hours from the time the Dot Hill engineers got the chip on the board and back in their lab, they had it up and running. Indeed, once a couple of minor board problems were fixed, the team was able to access its processors. A short time afterwards, they had functional DRAM, and probably within a week they were running RAID cycles. Not bad on a chip this large.
Trading lab debug for simulation, and lots of it: Consider the issues tossed at the Questa Advanced Simulator. For starters, there’s the sheer volume of traffic pulsing through the device and all the associated concurrency those bits bring. The four PCIe ports can route through any of the other PCIe ports or to DDR. Writing to two or three registers in a RAID engine can launch literally thousands of XOR operations requiring complex calculations. And all the while the two ARM processors are running and executing code. Even something as seemingly simple as routing data across the chip is fraught. All the ASIC components are connected via a high-speed, point-to-point switch fabric, which itself supports multitasking. That is, a single write can be written to multiple destinations, indeterminacy that makes for devilishly difficult simulations. Heavy internal and external traffic traveling at high speeds is directly tied to the second big challenge — how to test for all the myriad options, configurations and use cases. The Dot Hill team concluded that trying to handle all this with directed tests that covered all permutations and configurations just wasn’t possible. So they tried to run lots and lots of random tests over a long period of time on as many servers as they could to get as much coverage as possible.
“AVM, OVM, UVM — each is better than what we had before. Each one is making us more productive.”
Ty Sell, Dot Hill Verification Engineer
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Who Needs a DOT Physical?
A Department of Transportation (DOT) physical is required to ensure that professional drivers are in good health and that they can safely operate commercial vehicles. This protects your safety as well as those who share the road with you.
According to the Federal Motor Carrier Safety Administration (FMCSA), the group who governs DOT physicals as well as the health professionals who are certified to provide these services, a DOT physical is required when a driver is operating a commercial vehicle across state lines (also called “interstate driving”), that:
- Has a combined gross vehicle weight or weight rating of 10,001 lbs. or more
- Is designed or used to transport 9-15 passengers (including the driver) for compensation
- Is designed or used to transport 16 or more passengers (including the driver) regardless if for compensation
- Transports hazardous materials in quantities that require placarding under the hazardous materials regulations
Intrastate drivers, or drivers that stay within one state, may also require a DOT physical depending on the regulations that are specific to their states.
Where are DOT Physicals Administered?
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DOT physicals can only be administered by an FMCSA certified medical provider. These are providers who have specific FMCSA training and are registered on the National Registry of Certified Medical Examiners (NRCME). To find a DOT certified provider near you, you can search the NRCME site.
When Does a DOT Physical Need Renewed?
Depending on the outcome of the physical, a certification can be valid for up to 24 months. However, if the medical provider determines that the driver has existing conditions that need to be monitored, they can certify them for less than 24 months. Common reasons for giving a less than 24 month certification include high blood pressure, heart disease, diabetes, or a sleep disorder such as sleep apnea.
What Should You Expect During a DOT Physical Examination?
A DOT physical exam has many different components. Here are the six things to expect during a DOT physical.1
1. Medical History
During a DOT physical, the driver will need to provide extensive background on their medical history, including past surgeries, medications taken, and history of health conditions. It is important to be honest when providing health history as there could be repercussions later on if the correct health history is not provided.
2. Vitals Testing and Physical Examination
A large portion of the DOT physical is testing vitals. Testing includes pulse, height, weight, and blood pressure. The FMCSA also requires urinalysis, which looks at the protein, blood, and sugar in a urine sample to rule out underlying medical problems.
3. Vision Testing
In addition to more general testing, the FMSCA requires vision testing to ensure drivers are meeting the standard of at least 20/40 vision acuity in each eye with or without correction (glasses or contacts) and at least 70° field of vision in horizontal meridian measured in each eye (the area of visibility for each eye’s line of sight).
4. Hearing Testing
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Hearing testing is another requirement that is needed to pass a DOT physical. This is often tested through a whisper test, a test in which the examiner will record the distance from the driver at which a forced whispered voice can be heard. Hearing can also be evaluated through an audiometry test. An audiometry test is a way to measure the ability to hear sounds at different frequencies to determine if the driver has experienced hearing loss.
5. Physical Examination
A physical examination is also required and the examiner will first evaluate general physical appearance for things such as obesity and other medical conditions, and then examine the various body systems, including skin, lungs, the neurological system, and more.
6. Drug Screen
Dynex usb driver download. Although it is not part of the DOT physical exam, the DOT also requires a drug screen which can usually be completed at the same time as the physical examination.
How to Prepare for a DOT Physical at MedExpress
In general, the DOT physical itself should take approximately 45 minutes, so be sure to plan accordingly. Before arriving for a DOT physical, it is important for the driver to gather the necessary information and documents to bring. The driver should bring:
- A valid driver’s license
- List of current medications
- List of past surgeries and medical conditions
- List of any allergies
Additionally, if the driver has any pre-existing conditions that require additional paperwork, they should bring the necessary documentation . Examples of additional documentation include a copy of a stress test or echocardiogram for those with a Coronary Disease or completed medical exemptions for vision, hearing, or seizure disorders.
What Happens Next?
Upon finishing the physical exam, the examiner will complete his or her assessment and complete the required physical paperwork. The provider can certify a driver for the full two-year period or chose a shorter time period if medically necessary. Some health conditions require routine annual monitoring while others may just need a shortened initial monitoring period while other testing is performed. A certification card will be provided to the driver at the conclusion of the visit. If the provider does not have enough information at the time of the exam, and approval isn’t possible, the exam may be suspended while the additional information is gathered.
At MedExpress, we have over 1,000 providers who are certified to complete DOT physicals, and are always staying up-to-date on the latest regulations. You can schedule a DOT physical up to 30 days in advance by calling us at 1-844-832-2689.
For more commonly asked questions regarding DOT certifications, visit our Employer Health Services FAQs.