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Reducing swap space
Many a times it becomes necessary to reduce swap after installation. Here also we have three options. 1- Reduce swap space on existing LVM logical volume, 2- Remove logical volume used for swap, or 3- Remove swap file.
Reduce swap space on existing logical volume
Assuming /dev/vol_gr0/log_vol1 is the volume we want to reduce
1. Disable swap for associated logical volume:
# swapoff -v /dev/vol_gr0/log_vol1
2. Now reduce logical volume b 512 MB:
# lvm lvreduce /dev/vol_gr0/log_vol1 -L -512M
3. Format the new swap space now, using the following command:
# mkswap /dev/vol_gr0/log_vol1
4. lastly, enable this new reduced logical volume:
# swapon -va
5. We can now test whether the volume has been properly reduced or not:
# cat /proc/swaps
Or
# free
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