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Increase SWAP space in Linux

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#top

top – 10:10:10 up 15:34, 1 user, load average: 0.00, 0.00, 0.00
Tasks: 198 total, 1 running, 197 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.1%sy, 0.0%ni, 99.9%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 3924912k total, 280960k used, 3643952k free, 48812k buffers
Swap: 4288600k total, 0k used, 4288600k free, 78588k cached

#swapoff /dev/vg_foo/lv_swap

#lvextend -L+4G /dev/vg_foo/lv_swap

#mkswap /dev/vg_foo/lv_swap

#swapon /dev/vg_foo/lv_swap

top – 10:20:10 up 15:44, 1 user, load average: 0.00, 0.00, 0.00
Tasks: 198 total, 1 running, 197 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.1%sy, 0.0%ni, 99.9%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 3924912k total, 280960k used, 3643952k free, 48812k buffers
Swap: 8388600k total, 0k used, 8388600k free, 78588k cached