[Bug 267654] UFS "cylinder checksum failed" on temporary storage or data disk on arm64 vm in Azure

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 18 Nov 2022 01:38:47 UTC

--- Comment #8 from Li-Wen Hsu <lwhsu@FreeBSD.org> ---
(In reply to Kirk McKusick from comment #7)
> Is it possible to run fsck_ffs on the filesystem? If so, it will fix the bad checksums and you should then be good to go.

Thanks! Running fsck_ffs does fix the issue. I attach the log at

> Can you run tunefs on the filesystem? If so, I could easily add an option to disable cylinder group checksums.

Yes we can run tunefs on this filesystem. What's more, all this disk is
partitioned and formatted after boot. (refer to the above log) It's weird that
this filesystem is newly created by gpart and newfs but doesn't function like
da0 (OS disk) and mapped md(4) devices.

Is it safe to just disable (checking?) cylinder group checksums?  It seems
still weird that we need users to manually turn off cylinder group checksums
every time after running newfs.

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