It's possible, I've found the error: rdev->sb_start = sb_start; is missing within md.c within /* minor version 0; superblock after data */ >From my understanding, this means the new calculated superblock position isn't used. I changed: --- a/drivers/md/md.c 2021-09-30 08:11:08.000000000 +0000 +++ b/drivers/md/md.c 2021-11-11 14:54:10.535633028 +0000 @@ -2252,6 +2252,7 @@ if (!num_sectors || num_sectors > max_sectors) num_sectors = max_sectors; + rdev->sb_start = sb_start; } sb = page_address(rdev->sb_page); sb->data_size = cpu_to_le64(num_sectors); I tested it with 5.10.46 and resizing with superblock version 1.0 is now working for me. If this is correct, how can I get this into longterm 5.10.x and the current kernel upstream? Many thanks in advance. -- Mfg Markus Hochholdinger