帮助调整我的 LVM 分区大小

Question 1

你必须使用减少在家用设备上扩展在存储设备上。之后你必须使用调整2fs大小两者都调整文件系统的大小，如果不这样做，它将不会显示更改。

Answer

你必须使用减少在家用设备上扩展在存储设备上。之后你必须使用调整2fs大小两者都调整文件系统的大小，如果不这样做，它将不会显示更改。

Question 2

该lvresize命令用于改变逻辑卷的大小，并可用于在同一卷组内的两个 LV 之间“交易”范围。

lvresize在非空/活动卷上使用时要提供的最重要的标志是-r标志，来自手册页：

   -r, --resizefs
          Resize  underlying  filesystem  together with the logical volume
          using fsadm(8).

只要-r包含该标志，lvresize就会改变逻辑卷上的文件系统的大小以适应新的 LV 大小（缩小卷时，自动重新定位要缩小的区域中任何已占用的块），从而确保不会丢失任何数据。

对于典型用途，其他重要的标志是-L和-l标志，用于指定逻辑卷的目标大小或大小增量。同样，手册页：

   -l, --extents [+|-]LogicalExtentsNumber[%{VG|LV|PVS|FREE|ORIGIN}]
          Change or set the  logical  volume  size  in  units  of  logical
          extents.   With  the  +  or - sign the value is added to or sub‐
          tracted from the actual size of the logical volume  and  without
          it,  the value is taken as an absolute one.  The total number of
          physical extents affected will be  greater  than  this  if,  for
          example,  the  volume  is  mirrored.   The  number  can  also be
          expressed as a percentage of the total space in the Volume Group
          with  the suffix %VG, relative to the existing size of the Logi‐
          cal Volume with the suffix %LV, as a percentage of the remaining
          free  space  of the PhysicalVolumes on the command line with the
          suffix %PVS, as a percentage of the remaining free space in  the
          Volume  Group  with  the  suffix %FREE, or (for a snapshot) as a
          percentage of the total space in the Origin Logical Volume  with
          the suffix %ORIGIN.  The resulting value is rounded downward for
          the subtraction otherwise it  is  rounded  upward.   N.B.  In  a
          future  release,  when expressed as a percentage with PVS, VG or
          FREE, the number will be treated as an approximate total  number
          of  physical extents to be allocated or freed (including extents
          used by any mirrors, for example).  The code may currently allo‐
          cate or remove more space than you might otherwise expect.

   -L, --size [+|-]LogicalVolumeSize[bBsSkKmMgGtTpPeE]
          Change  or set the logical volume size in units of megabytes.  A
          size suffix of M for megabytes, G  for  gigabytes,  T  for  ter‐
          abytes, P for petabytes or E for exabytes is optional.  With the
          + or - sign the value is added or  subtracted  from  the  actual
          size  of  the logical volume and rounded to the full extent size
          and without it, the value is taken as an absolute one.

除此之外，-v还提供详细的输出、-t测试运行。

因此，要将 /home 缩小约 50GB，然后将该空间添加到 /storage，您可以使用：

# test run
lvresize -t -v -r -L-50G LVG/home

# If all looks good, shrink for real
lvresize -v -r -L-50G LVG/home

# Give it all to /storage
lvresize -v -r -l+100%FREE LVG/storage

~~所有这些~~ 生长分区甚至可以在卷已安装、正在使用，甚至在调整大小操作期间主动传输数据的情况下进行。LVM 将简单地在其他磁盘活动的“下方”工作以重新配置卷。（当然，以速度为代价。）

Answer