choosing_sd_card
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choosing_sd_card [2018/07/11 08:38] – akuzmuk | choosing_sd_card [2022/01/14 23:47] (current) – ↷ Links adapted because of a move operation 127.0.0.1 | ||
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- | ====== SD cadrs comparison | + | ====== |
+ | |||
+ | WebHMI requires SD to work. On this page we will explain how to select a best card that will suit your needs. | ||
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+ | {{ network: | ||
+ | |||
+ | ===== SD cards comparison | ||
There is a wide variety of SD cards. In addition to the obvious differences, | There is a wide variety of SD cards. In addition to the obvious differences, | ||
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//Please note that using a low-quality or fake memory card may result in **data loss** or unstable WebHMI operation. DO NOT use cards of doubtful origin. Preference is given to industrial memory cards. When you write a large amount of data, the lifetime of commercial cards in WebHMI can be only a few weeks after which the card goes down.// | //Please note that using a low-quality or fake memory card may result in **data loss** or unstable WebHMI operation. DO NOT use cards of doubtful origin. Preference is given to industrial memory cards. When you write a large amount of data, the lifetime of commercial cards in WebHMI can be only a few weeks after which the card goes down.// | ||
- | {{ :: | + | {{ network: |
+ | On this photo: Industrial-grade card (left) works for years under heavy load and this commercial-grade card (right) died after 2 months of work. Both cards are from the same manufacturer. | ||
+ | ===== Benchmark ===== | ||
We tested five different memory cards in order to understand their performance differences applicable to WebHMI. The test consists of writing 60,000 rows into a data table for graphs (5 columns). | We tested five different memory cards in order to understand their performance differences applicable to WebHMI. The test consists of writing 60,000 rows into a data table for graphs (5 columns). | ||
- | The test involved such drives: | + | The test involved such disks: |
* Silicon Power 4GB Class 4 MLC | * Silicon Power 4GB Class 4 MLC | ||
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At the same time, the use of MLC-memory is advisable in systems with higher requirements for recording speed and/or the need to store a large amount of data. Or where the SLC memory does not fit into the budget of the system. | At the same time, the use of MLC-memory is advisable in systems with higher requirements for recording speed and/or the need to store a large amount of data. Or where the SLC memory does not fit into the budget of the system. | ||
- | ====== | + | ===== Test your card ===== |
- | After a few years of running various | + | How to find a faster card? Test all of your candidates! |
+ | |||
+ | WebHMI has a built in benchmark to test performance of a particular card. Go to page **Maintenance-> | ||
+ | |||
+ | Here is example of such test run: | ||
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+ | {{ network: | ||
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+ | ===== 2017 Update | ||
+ | After a few years of running various | ||
- | {{ :: | + | {{ network: |
choosing_sd_card.1531298325.txt.gz · Last modified: 2018/07/11 08:38 by akuzmuk