I have some ProCurve 2920 switches with stacking modules and in case of failure, I would know if they are hot-swappable or I have to turn off the switch with failed module and replace it??
The switch will reboot when it rejoins the stack anyway (to make sure it has the current config)... If you have availability concerns, you need to make sure your device (eg server, switch) is connected to both switches in the stack with an LACP connection.
