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tytso / e2fsprogs

Ext2/3/4 file system utilities
http://ext4.wiki.kernel.org
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Whether it is possible to erase the signature of the old file system before executing mkfs.ext4 #180

Closed biubiuzy closed 6 months ago

biubiuzy commented 6 months ago

When users recreate the file system, they may forget to erase the old file system, resulting in file system probe errors and mount failed. see https://github.com/util-linux/util-linux/issues/2701

tytso commented 6 months ago

mkfs.ext4 will wipe at least the first few hundred kilobytes (in the case of a 4 MiB file system, 392k; in the case of a 1 TiB file system, the first 6 MiB) and the last 32k of the file system, which historically has been plenty to erase signatures of old systems. It appears that the drbd signature is in the first 4k, so I don't see why it wouldn't be wiped.

I've looked at the documentation of drbd, and it's terrible. I can't figure out how to format a drbd device after about 10 minutes of puzzling the through the user guide before I gave up as not worth my time. If you want to give me a precise reproduction instruction that makes it obvious how to create a drbd device, please feel free to reopen this bug. Otherwise, I'm going to close it as "not reproducible".