标签：zed swapoff size use swap head 命令 cached swap分区
一、SWAP分区大小设置参考：
4G以内的物理内存，SWAP 设置为内存的2倍。 4-8G的物理内存，SWAP 等于内存大小。 8-64G 的物理内存，SWAP 设置为8G。 64-256G物理内存，SWAP 设置为16G。
二、扩充或缩小SWAP分区：
[root@node1 ~]# swapon -s
Filename Type Size Used Priority
/dev/dm-1 partition 1048572 0 -1
[root@node1 ~]# free -m
total used free shared buffers cached
Mem: 1861 402 1458 1 30 136
-/+ buffers/cache: 235 1626
Swap: 1023 0 1023
[root@node1 ~]# swapoff /dev/mapper/vg_node1-lv_swap
[root@node1 ~]# free -m
total used free shared buffers cached
Mem: 1861 402 1459 1 30 136
-/+ buffers/cache: 235 1626
Swap: 0 0 0
[root@node1 ~]# fdisk -l
Disk /dev/mapper/vg_node1-lv_swap: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
[root@node1 ~]# lvextend -L 2G /dev/mapper/vg_node1-lv_swap Size of logical volume vg_node1/lv_swap changed from 1.00 GiB (256 extents) to 2.00 GiB (512 extents). Logical volume lv_swap successfully resized
最后要使用resizefs2命令重新加载逻辑卷的大小才能生效
resize2fs
/dev/mapper/vg_node1-lv_swap
[root@node1 ~]# free -m
total used free shared buffers cached
Mem: 1861 403 1458 1 30 136
-/+ buffers/cache: 236 1625
Swap: 2047 0 2047
格式化swap分区命令：
mkswap /dev/mapper/vg_node1-lv_swap
标签：zed swapoff size use swap head 命令 cached swap分区
原文地址：https://www.cnblogs.com/dahaoran/p/13852280.html
