With old sysvinit and Upstart, users could force a disk check on next reboot using a simple command (sudo touch /forcefsck), but that's no longer the case nowadays, with most Linux distributions using systemd. This article explains how to force fsck to run at boot time in two ways, which work with systemd. You'll also find a command that shows when a partition was last checked by fsck, at the end of the article.
Having a cluster built out of Raspberry Pi's is not only fun but also eases your work. As we discussed in our latest article in the series you can use the cluster to compile software or make it gather data from various sources on the Internet. There are many uses for such a thing. However, after compiling for an hour straight you might get curious as of how your nodes perform. How they work under load, if they're not under-powered or if the CPU temperature is not rising above desired levels.