48 lines
2.0 KiB
Markdown
48 lines
2.0 KiB
Markdown
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---
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title: "bcachefs"
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date: 2024-04-04T10:32:22+03:00
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draft: True
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---
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Once bcachefs got [merged][1] to Linux 6.7, I was excited to try it out. Who
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wouldn't? It intrigues me for a combination of features not readily available
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on other file systems:
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- *Tiered storage*: I want generally "fast" storage and "lots" of it (by my
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standards). Ideally, I would have a HDD with "cold" storage and SSD with
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"warm" storage (including writeback for fast writes). Currently all
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homeserver files are in a 2TB SSD drive. I would like to get an HDD and have
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a smaller (cheaper) SSD.
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- *Compression*: compression ratio for homeserver files is `1.07x`, but over 2x
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for `/nix`. Compression ratio for `/home` on my personal laptop is `1.23x`.
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Part 1:
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```
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$ bcachefs fsck /dev/mapper/luksroot
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< over 1 million lines like this ... >
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error validating btree node at btree rebalance_work level 0/1
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u64s 11 type btree_ptr_v2 53920:1262:U32_MAX len 0 ver 0: seq 914ce76a78ae3f22 written 281 min_key 0:19871775:1 durability: 1 ptr: 0:16177:0 gen 10
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node offset 141 bset u64s 94: invalid bkey: snapshot == 0
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u64s 5 type deleted 0:21863357:0 len 0 ver 0, fixing
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error validating btree node at btree rebalance_work level 0/1
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u64s 11 type btree_ptr_v2 53920:1262:U32_MAX len 0 ver 0: seq 914ce76a78ae3f22 written 281 min_key 0:19871775:1 durability: 1 ptr: 0:16177:0 gen 10
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node offset 141 bset u64s 92: invalid bkey: snapshot == 0
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u64s 5 type deleted 0:21863362:0 len 0 ver 0, fixing
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btree_node_read_work: rewriting btree node at btree=rebalance_work level=0 53920:1262:U32_MAX due to error
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done
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journal_replay... done
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check_alloc_info... done
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check_lrus... done
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check_btree_backpointers... done
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check_backpointers_to_extents... done
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check_extents_to_backpointers... done
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check_alloc_to_lru_refs... done
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check_snapshot_trees... done
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*** buffer overflow detected ***: terminated
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Aborted
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```
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[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9e87705289667a6c5185c619ea32f3d39314eb1b
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