[root@test]# mkdir -p /u01/swap
[root@test]# dd if=/dev/zero of=/u01/swap/swap bs=1024 count=2048000
2048000+0 records in
2048000+0 records out
[root@test]# mkswap /u01/swap/swap
Setting up swapspace version 1, size = 2097147 kB
[root@test]# swapon  /u01/swap/swap