Nikita Ofitserov comments

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                                            Nikita Ofitserov

Getting stuck trying to create a new 1 GiB file on an FS that has 41 GiBs of free space (needs: allocator to check for ENOSPC aside from disk reservations)

Your filesystem somehow got itself very low on actual non-reserved space, and copygc does not seem to make progress (?). Please post `bcachefs show-super` output, `bcachefs fs usage -ha` **before**...

Getting stuck trying to create a new 1 GiB file on an FS that has 41 GiBs of free space (needs: allocator to check for ENOSPC aside from disk reservations)

Two things of note: first, you are not actually using the DKMS module (1.31), your FS has version 1.28 which matches the in-tree 6.16 kernel version. Second, your FS has...

Getting stuck trying to create a new 1 GiB file on an FS that has 41 GiBs of free space (needs: allocator to check for ENOSPC aside from disk reservations)

> Is there anything that I can do in order to force it to use the DKMS bcachefs module instead of the in-tree bcachefs module? I'm not a NixOS expert,...

Getting stuck trying to create a new 1 GiB file on an FS that has 41 GiBs of free space (needs: allocator to check for ENOSPC aside from disk reservations)

@koverstreet Why do you think btree fragmentation is too high? The FS is using 441 KiB buckets, so with 256 KiB btree node size and 39733 buckets used we get...

Getting stuck trying to create a new 1 GiB file on an FS that has 41 GiBs of free space (needs: allocator to check for ENOSPC aside from disk reservations)

> I'm curious if this fs was created when bcachefs-tools was buggy and picking misaligned sizes Yes, as I've said [above](https://github.com/koverstreet/bcachefs/issues/954#issuecomment-3402958228): > Hooray for deterministic configuration, this clarifies the origin...

Performance degradation in recent versions.

First of all, you are indeed running an **ancient** version by bcachefs standards (and your bcachefs-tools version seems even older). The bcachefs project does not really support non-latest versions or...

Cannot remove completely failed drives

The last command (`bcachefs device remove 0 /my/bcachefs/mountpoint/`) is the correct one, but it is likely refusing to remove the drive because some data would be lost. Please check the...