I'm buying parts to setup a BTC node, a Lightning node, and a Nostr relay via Umbrel.
Do I really need to buy an SSD to store it all or is an HDD enough once its up and running?
Before doing anything, please read more and think about.
I wrote several guides about Umbrel and LN nodes in general. Exactly for noobs like you that just started. If you read my guides, your life will be much easier later.
Here is a selection of those you should read first:
The 1st and most important question for you is: for what do you need this LN node?
Then seize that node machine for your needs.
To answer your specific question:
yes you can run a node with a HDD, but will be a NIGHTMARE and quickly you will be in more trouble than you think.
Running a LN node + nostr relay = NOT A GOOD IDEA!
A LN node, especially one that is running also Electrum server, will have a lot of I/O on the disk. A nostr relay will add even more pressure and I/O to the disk and will make things worst.
Run a simple LN node with minimal apps required. All the rest run them on a separate machine.
Running a public LN node is a serious task and is affecting all other network participants. Having a shity node will not help anybody else. be responsible for what you are going to do!
Something I did not specify is that, regarding, Nostr, I just want a perosnal relay to store my data. I don't intend on making it public.
So I don't think that the I/O would be that bad. Would it?
I didn't realize the I/O issue that might arise if I run both on the same machine.
I might stick to BTC and Nostr for now then. This shouldn't be a problem right?
Yeah, it will take time. I started my sync 13 days ago. I'm at 83.99 % now syncing transactions from 1 year ago. Exponentially gets slower the higher percentage I reach. Soon there... 😅