I have had my workstation running on SATA-3 SSD RAID-0 for years and it never skips a beat, but If you’re storing important files, definitely go with RAID-1. If you only have 2 drives, I suggest using RAID-0, and even though there is no redundancy, RAID-0 rarely fails on solid state media. I suggest 3 (or more) drives which is the minimum required for a RAID-4/5 array that offers a good balance between redundancy and speed. The number of drives you have with determine what RAID level you will be able to create. RAID-10 will halve you total capacity, so 4x 64GB drives will give you 128GB storage. RAID-1 will halve your total capacity, so 2x 64GB drives will give you 64GB, and RAID-5/6 will give you roughly 2/3 of total capacity, so 3x 64GB drives will give you 128GB of storage. Remember that with RAID-0 you get the total amount of all drives put together, so 2x 64GB drives will give you 128GB. In terms of drive size, your budget will be the determining factor, so just get what you can afford. Note: Do not use HDD’s witch use more power, this can harm your Raspberry Pi®. USB 2.0 delivers up to 500 mA (at 5 V) and that’s enough for most 2.5″ HDD’s. The drives should all be the same size and preferably the same manufacturer for a good RAID array however, if you have an odd one out, just make sure it’s the same size or larger than the smallest drive. We will be using some old 2.5″HDD drives for our RAID array. You’ll also need a good quality micro-USB power pack suitable for the Raspberry Pi® you’re using. You can use Raspberry Pi’s from version 2 onwards, so 2B, 2B+ and RPi 3’s are fine, but I recommend the latest Raspberry Pi® 3. It’s pretty easy and shows you how to create a Linux RAID array which is a good skill to have. I want to extend my storage but it also has to be redundant, so I don’t loss any data that’s why I’m going to build a Raspberry Pi® 3 with RAID Storage using Some old 2.5″ HD drives, the Linux native RAID application MDADM.
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