升级后更改交换大小

升级后更改交换大小

我刚刚升级了 CPU/主板/RAM,现在我想增加交换大小,而不必重新格式化整个驱动器。这可能吗?我的硬盘设置如下。

mount 
/dev/mapper/ubuntu-root on / type ext4 (rw,errors=remount-ro) 
proc on /proc type proc (rw,noexec,nosuid,nodev) 
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev) 
none on /sys/fs/fuse/connections type fusectl (rw) 
none on /sys/kernel/debug type debugfs (rw) 
none on /sys/kernel/security type securityfs (rw) 
udev on /dev type devtmpfs (rw,mode=0755) 
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620) 
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755) 
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880) 
none on /run/shm type tmpfs (rw,nosuid,nodev) 
none on /run/user type tmpfs (rw,noexec,nosuid,nodev,size=104857600,mode=0755)
/dev/sda1 on /boot type ext2 (rw) 
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)
gvfsd-fuse on /run/user/raph/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,user=raph)

sudo fdisk -l

Disk /dev/sda: 200.0 GB, 200049647616 bytes
    255 heads, 63 sectors/track, 24321 cylinders, total 390721968 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x0007f9dc

Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      499711      248832   83  Linux
/dev/sda2          501758   390721535   195109889    5  Extended
/dev/sda5          501760   390721535   195109888   8e  Linux LVM

Disk /dev/mapper/ubuntu-root: 198.8 GB, 198784843776 bytes
    255 heads, 63 sectors/track, 24167 cylinders, total 388251648 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x00000000

Disk /dev/mapper/ubuntu-root doesn't contain a valid partition table

Disk /dev/mapper/ubuntu-swap_1: 1006 MB, 1006632960 bytes
    255 heads, 63 sectors/track, 122 cylinders, total 1966080 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x00000000

Disk /dev/mapper/ubuntu-swap_1 doesn't contain a valid partition table

答案1

在执行以下步骤之前,请先备份您的数据。这通常不会出现任何问题,但不包括错误、电源故障等。

  1. 首先 使用e2resize缩小根逻辑卷( )。/dev/mapper/ubuntu-root
  2. 然后使用lvresize将逻辑卷缩小到刚刚缩小的文件系统的大小。
  3. 现在,当您使用时vgdisplay,您会注意到该卷组中有一些可用空间(范围)。
  4. 暂时禁用交换swapoff -a
  5. 您可以使用刚刚通过缩小根 LV 获得的范围来lvextend扩展。/dev/mapper/ubuntu-swap_1
  6. 使用以下方式创建并重新启用交换mkswap /dev/mapper/ubuntu-swap_1 && swapon -a

答案2

如何在 Ubuntu 18.04 上更改交换大小,大约需要 10 分钟(无需重新启动):

sudo swapoff -a

# For 16GB of swap size
sudo dd if=/dev/zero of=/swapfile bs=1G count=16

sudo mkswap /swapfile
sudo swapon /swapfile

检查交换文件:

grep SwapTotal /proc/meminfo
sudo swapon --show
free -m

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