this post was submitted on 26 Aug 2024
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Data HDD with SSD catch drive (lemm.ee)
submitted 2 months ago* (last edited 2 months ago) by rambos@lemm.ee to c/selfhosted@lemmy.world
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After upgrading my internet connection I immediatelly noticed that my HDD tops 40 MB/s and bottlnecking download speed in qbittorrent. Is it possible to use SSD drive as a catch drive for 12 TB HDD so it uses SSD speeds when downloading and moves files to HDD later on? If yes, does it make sense? Anyone using anything simmilar? Would 512 GB be enough or could I benefit from 2TB SSD?

HDD is just for jellyfin (movies/shows), not in raid, dont need backup for that drive, I can afford risking data if that matters at all

All suggestions are welcome, Thx in advance

EDIT: I obviously have upset some of you, wasn't my intention, I'm sorry about that. I love to tinker and learn new things, but I could live with much lower speeds tho... Please don't hate me if I couldn't understand your comment or not being clear with my question.

HDD being bottleneck at 40 MB/s was wrong assumption (found out in meantime). I'm still trying to figure out what was the reason for download to be that slow, but I'm interested in learning about the main question anyway. I just thought I'm experiencing the same issue like many people today, having faster internet than storage. Some of you provided solutions I will look into, but need time for that and also have to fix whatever else I'm having issue with.

Keep this community awesome because it is <3

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[–] slazer2au@lemmy.world 9 points 2 months ago (1 children)

You can and Qbittorrent has this functionality built in. You set your in progress download folder to be the SSD then set the move when completed to your HDD.

As for the size, that would depend on how much you are downloading.

[–] rambos@lemm.ee 0 points 2 months ago (1 children)

But that would first download to SSD, then move to HDD and then become available (arr import) on jellyfin server, making it slower than not using SSD. Am I missing something?

[–] BombOmOm@lemmy.world 9 points 2 months ago* (last edited 2 months ago) (1 children)

The biggest thing is you have changed a random write to a linear write, something HDDs are significantly better at. The torrent is downloading little pieces from all over the place, requiring the HDD to move it's head all over the place to write them. But when simply copying off the ssd, it keeps the head in roughly one place and just writes lineally, utilizing it's maximum write speed.

I would say try it out, see if it helps.

Also, if the HDD is having to do other tasks at the same time, that will slow it down as the head can only ever be in one place.

[–] rambos@lemm.ee 2 points 2 months ago

I might try that, thx