Drives can easily be configured
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Drives can easily be configured

When you come to create a storage pool you need to choose what RAID type you want the NAS to use. The DS1019+ allows RAID 0, Basic, JBOD, 1, 5, 6 and 10. RAID 10 can only be used if there are four or more drives in the pool. The drop down interface allows you to select the type while the information panel clearly explains the properties of that type of RAID, with the pros and cons of each. Even if you don’t think you know what you are doing this interface takes most of the mystery out of the set-up.

Using RAID can feel a bit painful, as it seems we only get to use a part of the storage capacity we have bought. The idea of using a RAID system is that the drives effectively back each other up by the degrees that we choose. RAID 0 doesn't provide any backup so the full capacity of the drives is available as storage, but if a drive fails we lose the data that was stored on it.

RAID 10, on the other hand, effectively saves each element of data twice across the drives, so that if one fails whatever was on it will be duplicated somewhere on the other drives. This makes your data safe, but the downside is that it halves the amount of space we have to use. With my four 6TB drives in this test I can only save just under 11TB of data to the NAS when it is set up for RAID 10 - less than half of the potential 24TB I paid for. If I used RAID 0 however, I would be able to save close to 23TB on the same drives - but it would be insecure.

There's a good explanation of the different RAID types in the Synology Knowledge Base.