swap issues on Linux

clear the swap usage

free -to (Total memory usage)

free -m (Memory usage of swap)

swapoff -a && swapon -a ( swap off and on)

free

cat /proc/swaps sync; echo 3 > /proc/sys/vm/drop_caches

To free pagecache: # echo 1 > /proc/sys/vm/drop_caches

To free dentries and inodes: […]

Reducing Swap on an LVM2 Logical Volume 1) Check swap space and its utilization cat /proc/swaps # free

2) Scan (all disks) for Logical Volumes lvscan

[root@localhost ~]# lvscan ACTIVE ‘/dev/VolGroup/lv_root’ [47.44 GiB] inherit ACTIVE ‘/dev/VolGroup/lv_home’ [46.19 GiB] inherit ACTIVE ‘/dev/VolGroup/lv_swap’ [5.88 GiB] inherit

3) Disable devices and files for paging and swapping swapoff […]