I was happily coding along yesterday when my virtualized web server stopped responding to requests. I SSHed into the host and got the following error:
bash: /sbin/reboot: Input/output error
I had to restart using
echo 1 > /proc/sys/kernel/sysrq
echo b > /proc/sysrq-trigger
Once the server restarted, the system seemed to work OK. But what's going on? Is there a hard drive failure imminent? How can I tell?