/etc/mke2fs.conf:
[defaults]
blocksize = 4096
[fs_types]
small = {
blocksize = 1024
inode_size = 128
inode_ratio = 4096
}
We default to 4k, unless one is formatting small filesystems which from manpage:
If the filesystem size is greater than or equal to 3 but less than 512
megabytes, mke2fs(8) will use the filesystem type small.
And in your tests you do appear to use 500MiB big images.
I wonder if we should bump even small ext4 filesystems to use 4k sector
sizes.
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https://bugs.launchpad.net/bugs/1817097
Title:
pvmove causes file system corruption without notice upon move from 512
-> 4096 logical block size devices
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