情况简介：
Disk /dev/sda: 3.7 TiB, 4000787030016 bytes, 7814037168 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 Disklabel type: dos Disk identifier: 0x9e74984a Disk /dev/sdb: 3.7 TiB, 4000787030016 bytes, 7814037168 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 Disklabel type: dos Disk identifier: 0x081bd91f Device Boot Start End Sectors Size Id Type /dev/sdb1 2048 4095 2048 1M 83 Linux /dev/sdb2 4096 2101247 2097152 1G 83 Linux /dev/sdb3 2101248 270536703 268435456 128G 83 Linux /dev/sdb4 270536704 480251903 209715200 100G 83 Linux
把/dev/sdb3的swap分区转移到/dev/sda上
步骤：
在/dev/sda上创建同等大小的分区。这一步使用fdisk /dev/sda，用n新建分区即可，建立好之后是这样的：
Disk /dev/sda: 3.7 TiB, 4000787030016 bytes, 7814037168 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 Disklabel type: dos Disk identifier: 0x9e74984a Device Boot Start End Sectors Size Id Type /dev/sda1 2048 270536703 270534656 129G 83 Linux Disk /dev/sdb: 3.7 TiB, 4000787030016 bytes, 7814037168 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 Disklabel type: dos Disk identifier: 0x081bd91f Device Boot Start End Sectors Size Id Type /dev/sdb1 2048 4095 2048 1M 83 Linux /dev/sdb2 4096 2101247 2097152 1G 83 Linux /dev/sdb3 2101248 270536703 268435456 128G 83 Linux /dev/sdb4 270536704 480251903 209715200 100G 83 Linux
mkswap /dev/sda1 -L sda1-swap
root@host1:/# mkswap /dev/sda1 -L sda1-swap Setting up swapspace version 1, size = 129 GiB (138513739776 bytes) LABEL=sda1-swap, UUID=99090e64-564e-49d9-9ad5-c0e2743ea10c root@1:/# blkid /dev/sdb2: UUID="3f914361-4dc0-4c67-8440-cef9efb63640" TYPE="ext4" PARTUUID="081bd91f-02" /dev/sdb3: UUID="52424035-bedb-4a81-8ef6-a90c3a60b189" TYPE="swap" PARTUUID="081bd91f-03" /dev/sdb4: UUID="a211f762-a196-4d63-91c6-57b62a97d478" TYPE="ext4" PARTUUID="081bd91f-04" /dev/sda1: LABEL="sda1-swap" UUID="99090e64-564e-49d9-9ad5-c0e2743ea10c" TYPE="swap" PARTUUID="9e74984a-01"
可以看到新的swap分区已经建立好了
swapon查看当前在使用的交换分区
root@jw_10_176_50_25:/home/fnlp# swapon NAME TYPE SIZE USED PRIO /swap.img file 8G 0B -2 /dev/sdb3 partition 128G 0B -3
在/etc/fstab修改挂载
# /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # #/dev/disk/by-uuid/99090e64-564e-49d9-9ad5-c0e2743ea10c none swap sw 0 0 # / was on /dev/sdb4 during curtin installation /dev/disk/by-uuid/a211f762-a196-4d63-91c6-57b62a97d478 / ext4 defaults 0 0 # /boot was on /dev/sdb2 during curtin installation /dev/disk/by-uuid/3f914361-4dc0-4c67-8440-cef9efb63640 /boot ext4 defaults 0 0 /swap.img none swap sw 0 0
重启,swapon查看目前正在使用的swap分区
root@jw_10_176_50_25:/home/fnlp# swapon NAME TYPE SIZE USED PRIO /swap.img file 8G 0B -2 /dev/sda1 partition 129G 0B -3
发现原来的swap分区目前已弃用。利用fdisk /dev/sdb的d命令，删除原来的swap分区
