October 3, 20169 yr I'm moving Unraid to my HP Gen8 Microserver and wondered if it's wise to use the MicroSD slot on the board as a cache disk? I boot off USB and will be using the ODD bay for a 2.5" data disk if I can config this way. I've installed a 32Gb class10 card and Unraid 6.2 sees it and will allow me to add it if I choose (I assume), but lets say I get a 128Gb MicroSD card and assign it to cache, rather than take up a sata channel. (128Gb is big enough for my cache needs) I've searched but haven't seen anyone else comment they've done it, but I did see a post about the SD card becoming unusable if power suddenly removed from the server, put down to a bios fault which a UPS would cure). So, can it be done and should it be done? Any tales of success or disaster? Cheers
October 3, 20169 yr Community Expert (micro) SD cards have a very limited number of read-write cycles before they can be expected to fail (much less than a SSD). They also tend to have limited write performance. On that basis even if it could be made to work I would not think this would be a suitable device to use as a cache drive.
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