100 lines
3.2 KiB
Markdown
100 lines
3.2 KiB
Markdown
# PV(Physical Volume)
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PV(Physical Volume) 就是LVM的磁碟分區。
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## 建立PV
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建立PV的命令如下：
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```bash
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pvcreate /dev/sdb /dev/sdc /dev/sdd
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```
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```result
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`Physical volume "/dev/sdb" successfully created`
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`Physical volume "/dev/sdc" successfully created`
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`Physical volume "/dev/sdd" successfully created`
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```
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這樣我們就建立了3個PV。
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## 查看 PV
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使用 `pvdisplay` 和 `pvs` 來檢視你建立的 PV。
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`pvs` 輸出會比較簡短，例：
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```
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sudo pvs
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```
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```result
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PV VG Fmt Attr PSize PFree
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/dev/sda3 ubuntu-vg lvm2 a-- 57.62g 28.81g
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/dev/sdb1 vg1 lvm2 a-- <2.73t 0
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/dev/sdc1 vg1 lvm2 a-- <2.73t 0
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```
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`pvdisplay` 就比較詳細：
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```
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sudo pvdisplay
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```
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```result
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--- Physical volume ---
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PV Name /dev/sdb1
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VG Name vg1
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PV Size <2.73 TiB / not usable 3.44 MiB
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Allocatable yes (but full)
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PE Size 4.00 MiB
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Total PE 715396
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Free PE 0
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Allocated PE 715396
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PV UUID cWvfBE-Vbyp-l09E-QH0O-ZZoC-AdSG-t1J7TT
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--- Physical volume ---
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PV Name /dev/sdc1
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VG Name vg1
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PV Size <2.73 TiB / not usable 3.00 MiB
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Allocatable yes (but full)
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PE Size 4.00 MiB
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Total PE 715396
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Free PE 0
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Allocated PE 715396
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PV UUID eDdYr4-HSZC-wRBa-feGx-SHp1-Wfye-m0e1PY
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--- Physical volume ---
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PV Name /dev/sda3
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VG Name ubuntu-vg
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PV Size 57.62 GiB / not usable 2.00 MiB
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Allocatable yes
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PE Size 4.00 MiB
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Total PE 14751
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Free PE 7376
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Allocated PE 7375
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PV UUID zUlIaB-1Uof-3eF6-z5I7-OnqJ-UYDk-gThxJQ
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```
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# VG(Volume Group)
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VG(Volume Group) 由 PV 組成，你可以自由的排列組合。我們拿剛剛建立的3個PV把它組成一個VG。
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## 建立 VG
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```
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vgcreate vg1 /dev/sdb /dev/sdc /dev/sdd
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```
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`vg1` 是你的VG 名字，可以自由更改。
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後面的`/dev/sdb`、`/dev/sdc`、`/dev/sdd` 就是你剛剛建立的 PV。
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## 查看 VG
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使用 `vgdisplay` 和 `vgs` 來檢視你建立的 PV。
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# LV(Logical Volume)
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LV(Logical Volume) 可以對應到實際的硬碟，它才是可以被 mount 到 directory 的東西。LV 可以只使用 VG 某一部份的，也就是說一個VG可以切出很多LV。
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## 建立 LV
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- [What is LVM2 in Linux ?. LVM | by The_CodeConductor | Medium](https://medium.com/@The_CodeConductor/what-is-lvm2-in-linux-3d28b479e250)
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- [建立LVM磁區 - HackMD](https://hackmd.io/@yzai/BJUIhnAb9)
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- [LVM — pv, vg, lv. 动态的分配档案系统的空间，方便管理者随时调整空间，达到妥善使用硬件ㄒㄧㄠ | by Kiwi lee | Medium --- LVM — pv, vg, lv. 動態的分配檔案系統的空間，方便管理者隨時調整空間，達到妥善使用硬體ㄒㄧㄠ | by Kiwi lee | Medium](https://sean22492249.medium.com/lvm-pv-vg-lv-1777a84a3ce8)
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- [天黑的時候，星星就會出現!: Linux LVM (建立、擴充、移除LVM磁區) 操作筆記](https://sc8log.blogspot.com/2017/03/linux-lvm-lvm.html)
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- [Maxsolar's Linux Blog: LVM2學習筆記](https://maxubuntu.blogspot.com/2010/05/lvm2.html) |