改變 PE 大小 – LV 的 PE 數量

1. VG vg_mntx 的 PE 大小由 2M 改成 4M 後，LV pubx 的 LE 個數由原來的 12 個自動改成 6 個，總大小不變，一樣是 24M。

   [root@kvm10 ~]# lvdisplay /dev/vg_mntx/pubx 
     --- Logical volume ---
     LV Path                /dev/vg_mntx/pubx
     LV Name                pubx
     VG Name                vg_mntx
     LV UUID                FUbp9Q-jIOJ-rR6r-H2sv-mNqv-rlv5-3jYXEH
     LV Write Access        read/write
     LV Creation host, time kvm10.deyu.wang, 2019-11-11 14:16:55 +0800
     LV Status              available
     # open                 0
     LV Size                24.00 MiB
     Current LE             6
     Segments               1
     Allocation             inherit
     Read ahead sectors     auto
     - currently set to     8192
     Block device           253:3
   

2. 修改 LV pubx 的 LE 個數由原來的 6 個改成 50 個。

   [root@kvm10 ~]# lvresize -l 50 -r /dev/vg_mntx/pubx
   fsck from util-linux 2.32.1
   /dev/mapper/vg_mntx-pubx: 11/6144 files (0.0% non-contiguous), 2012/24576 blocks
     Size of logical volume vg_mntx/pubx changed from 24.00 MiB (6 extents) to 200.00 MiB (50 extents).
     Logical volume vg_mntx/pubx successfully resized.
   resize2fs 1.44.3 (10-July-2018)
   Resizing the filesystem on /dev/mapper/vg_mntx-pubx to 204800 (1k) blocks.
   The filesystem on /dev/mapper/vg_mntx-pubx is now 204800 (1k) blocks long.
   

3. 再查看 LV pubx 的 LE 個數已改成 50 個。

   [root@kvm10 ~]# lvdisplay /dev/vg_mntx/pubx | grep LE
     Current LE             50