Newer sfdisk versions (>= 2.26) issue a BLKRRPART ioctl to check if a device
is in use prior to partitioning it. However, the BLKRRPART ioctl may fail for
a number of other reasons, including when a device is allocated as
non-partitionable using alloc_disk(1). Since DRBD and LVM devices are
allocated as non-partionable, sfdisk will always think they're busy and fail.
Since we're dealing with DRBD and LVM devices mostly, we need to work our way
around this and pass --no-reread if sfdisk supports it.
Newer sfdisk versions (>= 2.26) issue a BLKRRPART ioctl to check if a device is in use prior to partitioning it. However, the BLKRRPART ioctl may fail for a number of other reasons, including when a device is allocated as non-partitionable using alloc_disk(1). Since DRBD and LVM devices are allocated as non-partionable, sfdisk will always think they're busy and fail.
Since we're dealing with DRBD and LVM devices mostly, we need to work our way around this and pass
--no-rereadif sfdisk supports it.