![]() RAID 5 requires at least three drives and offers parity data. You can then replace the faulty disk, and rebuild the RAID array. In this scenario, the second drive is a mirror of the first, so if one drive fails completely all your data is safe on the other. Most NAS drives will offer at least two bays, which means that you can set them up as RAID 1. Three of the most popular variants are RAID 1, 5 and 6. RAID can be quite complex but at a basic level, you’ll want to use it primarily to provide redundancy so if a disk fails your data is still safe. RAID stands for redundant array of inexpensive disks. It’s better to buy two disks and configure them in a RAID (see below), rather than rely on just one disk. You can buy the 6TB version for around $100/ £150 from Amazon. They also offer power management so they can adjust performance based on their temperature.Ī popular choice is the WD Red range. Hard disks designed for NAS use include more secure construction providing more resistance to vibration, which makes a lot of sense for a drive that’s designed to be on the whole time. NAS drives usually cost slightly more than normal PC hard drives, but it’s worth spending the extra because they’re designed to run constantly and tend to have a better warranty. ![]() A 4TB drive specifically for NAS use will set you back about $100/ £100. You can now get disks up to 12TB in size, and you can expect to pay around $250/ £300 for one. The advantage is that you can choose the drives you want and easily upgrade them later on. Many NAS drives come with no disks at all – these are known as diskless or bare drives. Try to work out how much storage you need right now, and what you’ll require five years from now. One of the first decisions to make is capacity.
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