Flush a bcache writeback cache in seconds, not days

<p><em>Before a reboot, a kernel upgrade or pulling an SSD out of a bcache setup, you want the dirty data on the backing disk. Switching to writethrough looks like the way to get it there, and on a busy disk it can leave the backlog draining at 4 KiB per second. Setting <code>writeback_percent</code> to 0 makes it drain at full speed: 950 MiB across three devices drained within 20 seconds for us.<

Read the source →