choosing_sd_card
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| choosing_sd_card [2018/07/11 08:47] – [2017 Update] 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 | + | ====== |
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| + | 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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| + | ===== 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.// | ||
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| + | 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 ====== | + | ===== Test your card ===== |
| How to find a faster card? Test all of your candidates! | How to find a faster card? Test all of your candidates! | ||
| - | WebHMI has a built in benchmark to test performance of particular card. Go to page **Maintenance-> | + | WebHMI has a built in benchmark to test performance of a particular card. Go to page **Maintenance-> |
| Here is example of such test run: | Here is example of such test run: | ||
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| - | ====== 2017 Update | + | ===== 2017 Update ===== |
| - | After a few years of running various cards we have found that Transcend Industrial 1GB SLC cards suits our needs in most cases. So we can sell these cards with WebHMI by request. | + | After a few years of running various cards we have found that Transcend Industrial 1GB SLC cards suit our needs in most cases. So we can sell these cards with WebHMI by request. |
| - | {{ :: | + | {{ network: |
choosing_sd_card.1531298830.txt.gz · Last modified: 2018/07/11 08:47 by akuzmuk