High quality Japanese capacitors (i.e.M.2 socket for a PCIe SATA/NVMe hard drive for the NAS operating system (blazingly fast!).Dual Gigabit LAN which gives your network redundancy if one LAN chip fails, or you can bond for faster throughput.If you’re choosing your own motherboard, some additional features to look for would be: The most important feature when choosing a motherboard is that it must have a PCIe slot that runs at a minimum x8 electrical, and either x8 or x16 physical, to accommodate the RAID card. Used server hardware is fine except for hard drives (more on that later). You don’t need to buy everything new (some RAID cards I recommend are used). You don’t even have to use a Mini- ITX motherboard if you don’t want to (although you’d need to choose a larger case). Now let’s start with the hardware and keep in mind, it’s very flexible. See Wikipedia RAID Levels for a good overview and technical data, and this RAID calculator will help you see how much disk space is available for each RAID level. I recommend RAID-5 or RAID-6 because they provide the best redundancy and speed (I use RAID-5 as you still retain 66% disk space compared to 50% for RAID-6). RAID 10 (nested RAID 1+0) (Excellent speed and redundancy, 50% disk space).RAID-6 Block-level striping with two parity blocks distributed across all member disks (Excellent speed & redundancy, 2 drive failures, 50% disk space).
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