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...before mkfs exists success: root@debian:~# cat strace.out | tail pwrite(3, "\1\2\0\0\2\2\0\0\3\2\0\0\367{\365\37\2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096, 6576672768) = 4096 fsync(3) = -1 EIO (Input/output error) pwrite(3, "\0\0\10\0\0\0 \0\231\231\1\0qm\37\0\365\377\7\0\0\0\0\0\2\0\0\0\2\0\0\0"..., 1024, 1024) = 1024 fsync(3) = -1 EIO (Input/output error) close(3) = 0 write(1, "done\n\n", 6done ) = 6 exit_group(0) = ? +++ exited...

...> root@debian:~# cat strace.out | tail > pwrite(3, "\1\2\0\0\2\2\0\0\3\2\0\0\367{\365\37\2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., > 4096, 6576672768) = 4096 > fsync(3) = -1 EIO (Input/output error) > pwrite(3, "\0\0\10\0\0\0 > \0\231\231\1\0qm\37\0\365\377\7\0\0\0\0\0\2\0\0\0\2\0\0\0"..., 1024, > 1024) = 1024 > fsync(3) = -1 EIO (Input/output error) > close(3) = 0 > write(1, "done\n\n", 6done > > ) = 6 > exit_group(0)...

Hi, So I've been hacking together an nbdkit plugin (similar to the "file" plugin, but it splits the file up into chunks): https://github.com/pepaslabs/nbdkit-chunks-plugin I got it to the point of being a working prototype. Then I threw it onto a raspberry pi, which it turns out only has a 50/50 shot of fallocate() working correctly. I'm checking the return code of