cache_writeback(8) on Linux
The text 9684e4bd97e5, as Debian 10 (Buster) shipped it.
writeback dirty blocks to the origin device.
Flags it lists
-
--buffer-size-meg -
--fast-device -
--help -
--list-failed-blocks -
--metadata-device -
--no-metadata-update -
--origin-device -
--version -
-V -
-h