Linux

50370 readers

1334 users here now

From Wikipedia, the free encyclopedia

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.

Rules

Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.
No misinformation
No NSFW content
No hate speech, bigotry, etc

Related Communities

Community icon by Alpár-Etele Méder, licensed under CC BY 3.0

founded 5 years ago

MODERATORS

AgreeableLandscape@lemmy.ml

nooter692@lemmy.ml

MarcellusDrum@lemmy.ml

cypherpunks@lemmy.ml

cyclohexane@lemmy.ml

d3Xt3r@lemmy.nz

Viability of using bcache on a 2 raid arrays? (lemmy.world)

submitted 2 days ago by qaz@lemmy.world to c/linux@lemmy.ml

5 comments fedilink hide all child comments

I was wondering about the possibility of using the following setup with write-caching

btrfs
    bcache
        fast
            mdadm (RAID-1)
                ssd_1
                ssd_2
        slow
            mdadm (RAID-5)
                hdd_1
                hdd_2
                hdd_3
                hdd_4

Is this viable / reasonable? The arch wiki mentions the possibility of data loss when using write-caching when the SSD fails, but shouldn't the SSD RAID array prevent that? It also mentions "bcache and BTRFS could leave you with a corrupted file system" is this still true? The wiki page mentions that it's unclear if this is still an issue.

Someone also left the following comment on the discussions page regarding BTRFS in 2023:

The issues with btrfs + bcache were fixed 10 years ago. The btrfs wiki no longer mentions historic gotchas for kernels older than 4.14. I think we should remove this warning. Any objections?

all 6 comments

sorted by: hot top controversial new old

[–] slacktoid@lemmy.ml 1 points 1 day ago (1 children)

I've got a similar setup without the raid bcache cache drive and wish I did that as it should make maintenance easier. I think it should work. Tho I dunno the gotchas for btrfs and have only done it with xfs. Why btrfs if you don't mind me asking?

[–] qaz@lemmy.world 1 points 1 day ago* (last edited 1 day ago)

I would like to use BTRFS for deduplication, CoW, and snapshots.

[–] merthyr1831@lemmy.ml 2 points 2 days ago (1 children)

Does this use Btfs' RAID5? If so you might want to avoid since RAID5/6 arent production ready for Btrfs and contain known bugs that can lead to parity loss.

[–] qaz@lemmy.world 2 points 1 day ago* (last edited 1 day ago) (1 children)

No, I'm aware of BTRFS's RAID 5/6 issues, this would use mdadm's RAID with BTRFS on the bcache block device.

[–] merthyr1831@lemmy.ml 2 points 1 day ago

gotcha!