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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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Bcachefs Merged Into Linux-Next (www.phoronix.com)

submitted 1 year ago by [email protected] to c/[email protected]

19 comments fedilink hide all child comments

cross-posted from: https://lemmy.world/post/4930979

Bcachefs making progress towards getting included in the kernel. My dream of having a Linux native RAID5 capable filesystem is getting closer to reality.

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[–] [email protected] 13 points 1 year ago* (last edited 1 year ago) (2 children)

a striped hot ssd cache for a massive raided backend on a VM host - all done with native filesystem support sounds pretty good to me.

[–] [email protected] 2 points 1 year ago

Reminds me of my older asus laptop - it had larger 512GB SSD and another intel optane 32gb ssd for cache.

I used to install OS to that intel optane drive (not enough for Windows lol), and used bigger ssd for /home.

With this feature - i think i could have a "single" disk for everything. :) so that's another use case for you.

[–] [email protected] 2 points 1 year ago* (last edited 1 year ago) (1 children)

You're running local storage for a VM host? Or are you talking more like whiteboxing your own NAS?

I understand what bcachefs does. I've used bcache many years ago to do exactly what you're describing, albeit for bare metal servers. I'm asking why.

I'm just trying to understand what the use case would be in 2023 outside of a home lab, given that cost per gigabyte is basically at parity between SSDs and HDDs when you consider TCO (i.e. when you price in the extra power and cooling overhead for the HDDs, failure rates, and such).

[–] [email protected] 3 points 1 year ago* (last edited 1 year ago) (1 children)

I have a pretty strong usecase for distributed Small/Medium Business bare metal VM hosts. most locations do not need NAS/SAN, and DAS will more than suffice. lower cost hardware with a near-line raided backend and SSD hotcache at FS level seems to be a pretty decent sweet spot.

obviously this is not some enterprise grade setup and YMMV, but I am pretty interested in a all-in-one FS solution. I am sure others may have more innovative setups where its even more interesting.

[–] [email protected] 3 points 1 year ago

Sounds like a great use case.

I'm assuming your nearline drives speak SAS? Are you doing redundant controllers on the backplane for multipathing and for fault tolerance? I'm not sure if bcachefs specifically supports it (or if that would happen at a different layer) but distros in general should support it.

TCO gets split into CAPEX and OPEX, so you come out ahead on the initial purchase even though it uses more power in the long run, which surely looks better to the business.