February 8, 20242 yr Almost exactly a year ago, I made this feature request which got 19 people upvoting. Quote Hybrid or "tiered" storage (NVME + SSD + HDD). Where "hot" data is in NVME, then transitions down the stack. Least used data is on hdd. In other words; a QNAP qtier alternative.Please implement 'bcache' https://docs.kernel.org/admin-guide/bcache.html as "source" disk in unraid. This way, actual spinning rust hard drives can be mapped to /dev/bcache0 /dev/bcache1 ... /dev/bcacheNThen unraid can on top of /dev/bcacheN format and put the filesystem and/or encryption layers. Edited July 8, 2025Jul 8 by TheLinuxGuy bcachefs is no longer an option.
February 8, 20242 yr I would like to eventually see bcachefs pools be added to unraid someday, but it still misses a lot of functionality. Namely, the ability to easily monitor an array, scrub, rebalance when adding/removing devices, and a proper process for device replacement. Not to mention there have been several major data loss bugs since the 6.7 merge. The filesystem is still considered experimental for a reason. I would prefer we hold off until it has had time to mature and become a better, well rounded solution before it's considered for inclusion in unraid. Especially given we already have ZFS which has Arc caching, which is much better than linux's native caching. Edited February 8, 20242 yr by JSE derp
February 13, 20242 yr Author @JSE that's fair, I am not married to the idea of bcachefs. There could be a similar caching solution achieved with lvmcache + dm-cache with btrfs under the hood too, this option should be much more stable and proven than bcachefs.
May 20, 20251 yr 30 minutes ago, L0rdRaiden said:Any news about Bcachefs?Lol.Are the patches even accepted again? I haven't heard anything about him in a while, since, well, the debacle 🤣
May 20, 20251 yr Author unraid should allow us to use bcache-linux (totally different than bcachefs)Why would we even bother about bcachefs? performance is abysmal, single developer is a dick and got 404'd from sending kernel patches. See below.
July 8, 2025Jul 8 Author And as expected... bcachefs will be dropped from the linux kernel. https://news.itsfoss.com/linux-kernel-bcachefs-drop/Best to implement bcache as block /dev/bcacheN as the layer on top of disks on unraid IMO
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