The original post: /r/datahoarder by /u/Cloudssj43 on 2024-12-31 19:03:47.

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Operating system:

Ubuntu Server 24.04.1 LTS (Running it as a NAS/homeserver)

Disk Setup:

/ & /home -> 500 GB SSD

/mnt/hdd1 -> 12 TB ext4 partition

/mnt/hdd2 -> 12 TB ext4 partition

/mnt/hdd3 -> 12 TB ext4 partition

/mnt/storage -> MergerFS of hdd1 and hdd2

Software

Snapraid of hdd1 and hdd2 with hdd3 as the parity drive

rsnapshot of some folders in /mnt/storage stored on hdd3

Samba running that gives access to /mnt/storage

Jellyfin/QBittorrent/Sonarr running as docker containers that has /mnt/storage mounted

hd-idle configured to sleep drives after 30min of inactivity (Testing shows drives spin up on avg 3-4 times in 1 day)

Status:

Everytime I navigate the NAS filestystem in Windows, both hdd1 and hdd2 spin up just to read the filesystem metadata

Everytime I open Jellyfin’s homepage, it tries to access all the thumbnail .jpg files.

/mnt/hdd1 (Which currently stores all my Qbittorrent data) is constantly spinning since I’m seeding some stuff.

Question:

I have a 2TB SSD that I have the option of putting into my NAS and the ideal scenario would be it being used as a cache such that the most commonly used items get stored onto it so that filesystem access is limited to only the SSD. Is there a way to get such a configuration?

I looked up lv cache (but i think it requires me to have my hdds in a LVM group which i have not?) as well as bcache, but I’m a little out of my depth trying to understand how they work. Any advice?

Edit: I’m fine if when I stream my shows/movies from Jellyfin I spin up a drive, I mostly want the Samba/Qbittorrent/Jellyfin thumbnails to not spin up my drives.