Suspend
This article describes how to suspend your MD to RAM.
Motivation
- Saving power
- Quick boot (usefull if your MD is noisy and you turn it off when not in use)
Setup
There are several different ways of achiving suspend, this is one using the hibernate scripts, which can be configured to use different ways of suspending the machine.
On the MD in question, make sure you have the uswsusp and hibernate packages installed.
apt-get install uswsusp hibernate
Using NVidia graphics card
Edit your xorg.conf file and add this line to the "Device" section:
Option "NvAGP" "1"
Also make sure no other vendor AGP modules are loaded, like intel_agp, sis_agp etc. The agpgart module is fine, though. Use
lspci | grep agp
to list all loaded agp modules.
If you see any agp modules besides agpgart, add a line to /etc/modprobe.d/blacklist to blacklist the module.
Edit the /etc/hibernate/ram.conf file, and comment the two lines
EnableVbeTool yes VbetoolPost yes
Edit the /etc/hibernate/blacklisted-modules, and comment the nvidia line.
To suspend the MD
Then enter hibernate-ram to suspends the MD to ram. The script first checks if it recognizes your hardware, to take the correct actions before suspending. If you get a message that your machine is unknown, edit the /etc/hibernate/ususpend-ram.conf file, and un-comment the
USuspendRamForce yes
line, to force it to suspend anyway.
References
The hibernate script uses uswsusp by default when trying to suspend to ram. For more information about the s2ram utility used, read the S2ram howto
