LVM:缩小/划痕,扩展SWAP

LVM:缩小/划痕,扩展SWAP
kamals@poc02:~$ sudo lvs
  LV                     VG        Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root                   vg_system -wi-ao----  63.98g
  scratch                vg_system -wi-ao---- 465.66g
  .
  .
  swap                   vg_system -wi-ao----  16.00g
  var                    vg_system -wi-ao----  31.99g
kamals@poc02:~$ sudo vgs
  VG        #PV #LV #SN Attr   VSize   VFree
  vg_system   1   6   0 wz--n- 930.51g 296.88g
kamals@poc02:~$ df -h /scratch/
Filesystem                     Size  Used Avail Use% Mounted on
/dev/mapper/vg_system-scratch  459G  726M  435G   1% /scratch
kamals@poc02:~$ sudo umount /scratch

kamals@poc02:~$ sudo e2fsck -f /dev/mapper/vg_system-scratch
e2fsck 1.42.13 (17-May-2015)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
scratch: 25/30523392 files (16.0% non-contiguous), 2134330/122070016 blocks
kamals@poc02:~$ sudo resize2fs /dev/mapper/vg_system-scratch 450G
resize2fs 1.42.13 (17-May-2015)
Resizing the filesystem on /dev/mapper/vg_system-scratch to 117964800 (4k) blocks.
The filesystem on /dev/mapper/vg_system-scratch is now 117964800 (4k) blocks long.
kamals@poc02:~$ sudo lvreduce -L -9G /dev/mapper/vg_system-scratch
  WARNING: Reducing active logical volume to 456.66 GiB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce scratch? [y/n]: y
  Size of logical volume vg_system/scratch changed from 465.66 GiB (119209 extents) to 456.66 GiB (116905 extents).
  Logical volume scratch successfully resized.
kamals@poc02:~$ sudo mount /dev/mapper/vg_system-scratch /scratch/
kamals@poc02:~$ lsblk | grep scratch
  ├─vg_system-scratch                252:4    0 456.7G  0 lvm  /scratch
kamals@poc02:~$
kamals@poc02:~$ df -h /scratch/
Filesystem                     Size  Used Avail Use% Mounted on
/dev/mapper/vg_system-scratch  443G  727M  420G   1% /scratch
kamals@poc02:~$


SWAP Space extend:
===================

kamals@poc02:~$ lsblk | grep swap
  ├─vg_system-swap                   252:1    0    16G  0 lvm  [SWAP]
kamals@poc02:~$ sudo swapoff /dev/vg_system/swap
kamals@poc02:~$
kamals@poc02:~$ sudo lvresize -L+9G /dev/vg_system/swap
  Size of logical volume vg_system/swap changed from 16.00 GiB (4095 extents) to 25.00 GiB (6399 extents).
  Logical volume swap successfully resized.
kamals@poc02:~$ sudo mkswap /dev/vg_system/swap
mkswap: /dev/vg_system/swap: warning: wiping old swap signature.
Setting up swapspace version 1, size = 25 GiB (26839347200 bytes)
no label, UUID=5fbefbfc-b0fc-46d5-8d5e-b547c184ac14
kamals@poc02:~$ sudo swapon /dev/vg_system/swap
kamals@poc02:~$
kamals@poc02:~$ free -th | grep -i swap
Swap:           24G          0B         24G
kamals@poc02:~$
kamals@poc02:~$ lsblk | grep swap
  ├─vg_system-swap                   252:1    0    25G  0 lvm  [SWAP]

在这里,我尝试缩小/scratch数据磁盘9G并增加空间量SWAP

我在这里看到 LVM 的减少/scratch正在按预期工作(465.66G-9G ~= 456.7G),但为什么 FS 大小只是通过减少而产生df -h的。443G459G9G

我再次执行减少1G,我看到 df 值减少到428G

kamals@poc02:~$ df -h /scratch/
Filesystem                     Size  Used Avail Use% Mounted on
/dev/mapper/vg_system-scratch  428G  727M  405G   1% /scratch
kamals@poc02:~$

我有几个问题,

我在这里做错了什么吗?

这些步骤是否正确?我可以通过停机来在生产服务器中实施它们吗?

这些步骤是否有可能导致数据丢失?

还有更好的解决办法吗?

太感谢了!

答案1

您使用 450G 作为文件系统大小:

$ sudo resize2fs /dev/mapper/vg_system-scratch 450G

但你的 LV 比这个大(456.66G):

$ sudo lvreduce -L -9G /dev/mapper/vg_system-scratch
WARNING: Reducing active logical volume to 456.66 GiB
THIS MAY DESTROY YOUR DATA (filesystem etc.)

因此,您可以进一步减小 LV(至 450G),或者通过再次调用resize2fs.否则 6.66G 将保持未使用状态。

实际上lvreduce可以--resizefs选择为您处理文件系统大小调整。

即使您手动执行此操作,也没有实际需要使文件系统小于 LV 大小。如果您将 450G 用于文件系统,则也可以将 450G 用于 LV。不过,使用整数而不是分数会有所帮助。如果您确实希望它为 456.66GiB,则最好用 MiB 来表示。

关于其他丢失的空间,请检查tune2fs -l该文件系统是否有根保留(Reserved block count!= 0),如果有,请使用 进行更改tune2fs -m。如果您不需要/不想要此文件系统的根保留。

答案2

尝试了lvreduce一下--resizefs,恢复了17G。

kamals@poc02:~$ sudo lvs
scratch                vg_system -wi-ao---- 454.66g

kamals@poc02:~$ df -h /scratch/
Filesystem                     Size  Used Avail Use% Mounted on
/dev/mapper/vg_system-scratch  428G  727M  405G   1% /scratch
kamals@poc02:~$ sudo e2fsck -f /dev/mapper/vg_system-scratch
.
.
scratch: 25/28442624 files (16.0% non-contiguous), 2003774/113770496 blocks

kamals@poc02:~$ sudo lvreduce --resizefs -L -3G /dev/mapper/vg_system-scratch
fsck from util-linux 2.27.1
scratch: clean, 25/28442624 files, 2003774/113770496 blocks
resize2fs 1.42.13 (17-May-2015)
Resizing the filesystem on /dev/mapper/vg_system-scratch to 118400000 (4k) blocks.
The filesystem on /dev/mapper/vg_system-scratch is now 118400000 (4k) blocks long.

  Size of logical volume vg_system/scratch changed from 454.66 GiB (116393 extents) to 451.66 GiB (115625 extents).
  Logical volume scratch successfully resized.

kamals@poc02:~$ sudo mount /dev/mapper/vg_system-scratch /scratch/
kamals@poc02:~$ df -h /scratch/
Filesystem                     Size  Used Avail Use% Mounted on
/dev/mapper/vg_system-scratch  445G  727M  422G   1% /scratch
kamals@poc02:~$

kamals@poc02:~$ sudo lvs
  scratch                vg_system -wi-ao---- 451.66g

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