bcachefs patreon

Online fsck

🕑 Added 2023-12-09 02:23:22 +0000 UTC

Comments

Wolfgang

Hey Kent! Not sure where to ask it, so I'll ask here – is it possible to use bcachefs in order to create a tiered storage array where the HDDs are spun down as much as possible? I have four 2TB SSDs and three 16TB HDDs, and I'd like to keep the latter mostly spun down for noise and power reasons. The idea is – the writes would go to the SSDs by default, and then replicated to the HDDs once a day/week – not immediately, and only if the SSD array is at least 50% full. Then, if certain files get read from the HDDs often, they'd be "promoted" to the SSDs and kept there until they're not accessed frequently.

Kent Overstreet

It'll be awhile before I get to it (but funding could change that, naturally)

Peter Waller

What's the status of/forecast for scrub? My understanding is that reading out the full FS is not enough to detect bad mirrors and restore redundancy, because if you read the good mirror the bad data remains hidden. Does this relate to fsck or is it independent?

Damian Kaczmarek

Thanks for making bcachefs. I just converted my workspace disk to bcachefs and I am seeing >50% space savings with little to no performance cost. :-) Looking forward to moving all of my disks. Curious - what kind of situations would lead to the disk needing fsck? One candidate is obviously bugs :-) But how would bcachefs react to hardware issues? How would the user learn about it?