What is resume= used for in my grub boot settings?

I've constantly seen the resume=/dev/foo access in/ boot/grub/menu. lst, which it represents the swap dividing, yet I've never ever doubted its usage.

title SUSE Linux Enterprise Server 11 SP2 - 3.0.13-0.27 (default)
    root (hd0,0)
    kernel /boot/vmlinuz-3.0.13-0.27-default root=/dev/sda1 insmod=qla4xxx resume=/dev/sda2 crashkernel=256M-:128M showopts
    initrd /boot/initrd-3.0.13-0.27-default

I was restarting a web server today and also saw a boot message mentioning Starting manual resume from disk. Seems like some type of hibernate. So just what is resume? I'm attempting to Google it, yet all I'm seeing is resumes/CVs for Linux Admins.

2022-06-07 14:31:51
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Answers: 1

From the list of kernel parameters:

resume=     [SWSUSP]
        Specify the partition device for software suspend


SWSUSP  Software suspend (hibernation) is enabled.

So of course, it is made use of for hibernation.

2022-06-07 14:49:36