LVM的指令

Linux LVM的指令
一、建立LVM Filesystem（50MB PV → 50MB VG → 30MB LV → /lvmdata）
1. # fdisk /dev/hda　← 分割 /dev/hda
2. create a new 50MB (8e) partition　← 建立partition
3. # partprobe　← 不用重新開機，立即生效partition
4. # pvcreate /dev/hdaX　← 將 /dev/hdaX 轉成 PV
5. # vgcreate rootvg /dev/hdaX [ /dev/hdaX /dev/hdaX.......]　← 建立 VG，名稱為 rootvg
6. # lvcreate -L 30M -n lv01 rootvg　← 在 rootvg（VG）建立 LV，容量為 30MB，名稱為 lv01
7. # mke2fs -j /dev/rootvg/lv01　← 格式化為 EXT3
8. # mkdir /lvmdata　← 建立目錄
9. # mount /dev/rootvg/lv01 /lvmdata　← 將 lv01 掛載到 /lvmdata

二、擴大 /lvmdata 空間（30MB → 40MB）
1. # df -h　← 檢查 /lvmdata 目前空間為 30MB
2. # lvextend -L +10M /dev/rootvg/lv01　← 將 lv01 擴大 10MB 空間
3. # df -h　← 檢查 /lvmdata 還是 30MB
4. # ext2online /dev/rootvg/lv01　← 將 lv01 空間立即生效
5. # df -h　← 空間已增加至 40MB

三、將 rootvg 虛擬 HD 由 50MB → 100M
想法：再新增一個 PV，將此 PV 加入 rootvg，擴大 rootvg 容量


1. # fdisk /dev/hda　← 重新分割一個硬碟或partition
2. create a new 50MB (8e) partition　← 建立partition
3. # pvcreate /dev/hdaX　← 將 /dev/hdaX 轉成 PV
4. # vgextend rootvg /dev/hdaX　← 將新的 partition 合併到 rootvg
5. # vgdisplay rootvg　← 顯示 rootvg 目前容量


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