How to rename a logical coupon of type swap in LVM

今天，我們給大家介紹一下，如何重新命名一個類型爲swap的邏輯券。

首先，我們先來看一下，系統中的券。

lwk@qwfys:~$ sudo lsblk -l
NAME            MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
mint--vg-root   253:0    0 475.5G  0 lvm  /
mint--vg-swap_1 253:1    0   980M  0 lvm  [SWAP]
nvme0n1         259:0    0   477G  0 disk 
nvme0n1p1       259:1    0   512M  0 part /boot/efi
nvme0n1p2       259:2    0 476.4G  0 part 
lwk@qwfys:~$ sudo pvdisplay 
  --- Physical volume ---
  PV Name               /dev/nvme0n1p2
  VG Name               mint-vg
  PV Size               <476.44 GiB / not usable 0   
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              121968
  Free PE               0
  Allocated PE          121968
  PV UUID               njLf5d-c2k8-4gwQ-HrwG-yb8j-S3CH-293PnQ
   
lwk@qwfys:~$ sudo vgdisplay   
  --- Volume group ---
  VG Name               mint-vg
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  7
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <476.44 GiB
  PE Size               4.00 MiB
  Total PE              121968
  Alloc PE / Size       121968 / <476.44 GiB
  Free  PE / Size       0 / 0   
  VG UUID               gbIrR2-xW4a-4zr3-18md-eo9q-BXBw-1tWRD3
   
lwk@qwfys:~$ sudo lvdisplay     
  --- Logical volume ---
  LV Path                /dev/mint-vg/root
  LV Name                root
  VG Name                mint-vg
  LV UUID                1jZgWZ-y3b4-LoTP-H32i-nz5H-A2xh-tYUTMb
  LV Write Access        read/write
  LV Creation host, time mint, 2020-05-24 23:39:52 +0800
  LV Status              available
  # open                 1
  LV Size                475.48 GiB
  Current LE             121723
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0
   
  --- Logical volume ---
  LV Path                /dev/mint-vg/swap_1
  LV Name                swap_1
  VG Name                mint-vg
  LV UUID                1SkgwJ-DTZe-XD77-Enlg-CoZz-FX1l-Gz2b3e
  LV Write Access        read/write
  LV Creation host, time mint, 2020-05-24 23:39:52 +0800
  LV Status              available
  # open                 2
  LV Size                980.00 MiB
  Current LE             245
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1
   
lwk@qwfys:~$

上面是我們系統中整個lvm的具體情況，現在我們要做的事就是希望將邏輯券/dev/mint-vg/swap_1重新命名爲/dev/mint-vg/swap。

lwk@qwfys:~$ sudo lvremove /dev/mint-vg/swap_1
  Logical volume mint-vg/swap_1 in use.
lwk@qwfys:~$ sudo swapoff /dev/mint-vg/swap_1
lwk@qwfys:~$ sudo lvremove /dev/mint-vg/swap_1
Do you really want to remove and DISCARD active logical volume mint-vg/swap_1? [y/n]: y
  Logical volume "swap_1" successfully removed
lwk@qwfys:~$ lsblk -l
NAME          MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
mint--vg-root 253:0    0 475.5G  0 lvm  /
nvme0n1       259:0    0   477G  0 disk 
nvme0n1p1     259:1    0   512M  0 part /boot/efi
nvme0n1p2     259:2    0 476.4G  0 part 
lwk@qwfys:~$
lwk@qwfys:~$ sudo lvcreate -L 8G -n mint-vg-swap mint-vg
  Volume group "mint-vg" has insufficient free space (245 extents): 2048 required.
lwk@qwfys:~$ sudo lvcreate -L 980M -n mint-vg-swap mint-vg
[sudo] password for lwk:       
  Logical volume "mint-vg-swap" created.
lwk@qwfys:~$
lwk@qwfys:~$ sudo lsblk -l
[sudo] password for lwk:       
NAME          MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
mint--vg-root 253:0    0 475.5G  0 lvm  /
mint--vg-swap 253:1    0   980M  0 lvm  
nvme0n1       259:0    0   477G  0 disk 
nvme0n1p1     259:1    0   512M  0 part /boot/efi
nvme0n1p2     259:2    0 476.4G  0 part 
lwk@qwfys:~$ 
lwk@qwfys:~$ sudo mkswap /dev/mint-vg/swap 
Setting up swapspace version 1, size = 980 MiB (1027600384 bytes)
no label, UUID=aa89b812-bf49-4109-acd1-c66251d12f02
lwk@qwfys:~$