What's the difference between IPMI cycle and reset?

ipmi ipmitool

35,152

Solution 1

Reset does a warm boot. Cycle completely powers off the machine then powers it back on, which has the server go through a cold boot.

Solution 2

Here is an explanation in terms of power stats. It comes from here: http://software.intel.com/en-us/forums/showthread.php?t=80403

The "Reset" command performs a warm-reset. The equivalent to the old Ctrl-Alt-Del in DOS. The "power cycle reset" is the same as pressing the power button to turn the machine off, followed by pressing the power button again to turn the machine on. It actually forces the system to transition from a S0 state to a S5 state and back to a S0 state. The "Reset" just transitions from S0 to S0 again. In some cases, the BIOS may require a power off to reload the BIOS if you've updated the BIOS. The PCR can do that, but the simple Reset can't.

Solution 3

The same as the difference between pushing the reset button and power off + power on, i.e. when using reset you skip some of the POST (power on self test).

35,152

Rahim

I've been Linux user for over 10 years, and been computing since around age 11. I got my start in programming by learning Perl on my Debian machine in high school. Since then I've learned numerous languages including C, C++, and Python. I've also dabbled in Java and assembly. I have a bachelors degree in Computer Engineering from Simon Fraser University in Burnaby, BC, Canada. I've worked in Japan as a CAD software developer in C++ on Windows. Not my favorite environment, but an interesting project never the less. I'm currently employed by a Vancouver-based biotech startup working primarily on systems level projects but doing my fair share of software development. My favorite programming language is Python and I use it nearly every day. My recent interests lie in virtualization, hpc, and large-scale systems management. I'm an active contributor to the Bcfg2 project.

Updated on September 17, 2022

Comments

Rahim almost 2 years

What's the difference between restarting a machine using the ipmitool subcommands chassis power cycle versus chassis power reset?
Rahim almost 14 years

I thought it was something like that, wasn't sure which was which though. Thanks.