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In this blogpost, I describe the Synology DS620slim. Mostly these are notes for myself, so when I need to replace something in the future, I can remember how I built the system. It’s a “NAS” (network attached storage) server that has six hot-swappable bays for 2.5 inch laptop drives.
That’s right, laptop 2.5 inch drives. It makes this a tiny server that you can hold in your hand.
The purpose of a NAS is reliable storage. All disk drives eventually fail. If you stick a USB external drive on your desktop for backups, it’ll eventually crash, losing any data on it. A failure is unlikely tomorrow, but a spinning disk will almost certainly fail some time in the next 10 years. If you want to keep things, like photos, for the rest of your life, you need to do something different.
The solution is RAID, an array of redundant disks such that when one fails (or even two), you don’t lose any data. You simply buy a new disk to replace the failed one and keep going. With occasional replacements (as failures happen) it can last decades. My older NAS is 10 years old and I’ve replaced all the disks, one slot replaced twice.
This can be expensive. A NAS requires a separate box in addition to lots of drives. In my case, I’m spending $1500 for a 18-terabytes of disk space that would cost only $400 as an external USB drive. But amortized for the expected 10+ year lifespan, I’m paying $15/month for this home system.
This unit is not just disk drives but also a server. Spending $500 just for a box to hold the drives is a bit expensive, but the advantage is that it’s also a server that’s powered on all the time. I can setup tasks to run on regular basis that would break
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