Resizing Swap in LVM on Fedora 6

tnine9 · 03-03-2007, 11:58 AM

Hi all,
I have fedora 6 running in a vmware image. I'm having issues with lighttpd and ruby on rails eating all of my RAM and swap when I get several concurrent users. Since this load rarely happens, I would like to increase my swap space until I can install more RAM on the host machine. The swap appears to be in the lvm group 00 volume 1. Below is my fstab

/dev/VolGroup00/LogVol00 / ext3 defaults 1 1
LABEL=/boot /boot ext3 defaults 1 2
devpts /dev/pts devpts gid=5,mode=620 0 0
tmpfs /dev/shm tmpfs defaults 0 0
proc /proc proc defaults 0 0
sysfs /sys sysfs defaults 0 0
/dev/VolGroup00/LogVol01 swap swap defaults 0 0

How can I shrink LogVol00 and expand LogVol01? I can't find any documentation that is a sufficiently satisfying "how to". Any help would be greatly appreciated. As a I said earlier, its a vmware guest OS, so if it destroy my LVM I can always restore the snapshot.

Thanks,
Todd

acid_kewpie · 03-03-2007, 12:05 PM

if this really is a temporary measure, just use a secondary swap file whereever you have some free space. you can use mkswap on a file just as easily as a partition, e.g.

Code:

dd if=/dev/null of=/swap.file bs=1024 count=512
mkswap /swap.file
swapon /swap.file

tnine9 · 03-03-2007, 12:12 PM

Thanks for the reply. I actually have already done this, but I've read its a performance hit on the file system. I was unsure how big of a hit it would be in an LVM environment since there are now two layers of abstraction between the data and the file system (plus vmware). Does it really make a difference, or is it just a purist approach to not use temporary swap file?