Sunday, July 11, 2010

Reduce Swap in Red Hat 5

Red Hat recommended SWAP to be no larger than 4Gb,

1) Show current swap
swapon -s

2) Unmount Swap
swapoff /dev/mapper/VolGroup00-LogVol01

3) Reduce from 54Gb to 4Gb (Each LV Extent is 32Mb)
lvreduce -l -1600 /dev/VolGroup00/LogVol01

4) Reformat swap
mkswap /dev/VolGroup00/LogVol01

5) Mount swap as defined in /etc/fstab
swapon -a

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