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Commit | Line | Data |
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1 | Logical Volume Manager (LVM) | |
2 | ---------------------------- | |
3 | include::attributes.txt[] | |
4 | ifdef::wiki[] | |
5 | :pve-toplevel: | |
6 | endif::wiki[] | |
7 | ||
8 | Most people install {pve} directly on a local disk. The {pve} | |
9 | installation CD offers several options for local disk management, and | |
10 | the current default setup uses LVM. The installer let you select a | |
11 | single disk for such setup, and uses that disk as physical volume for | |
12 | the **V**olume **G**roup (VG) `pve`. The following output is from a | |
13 | test installation using a small 8GB disk: | |
14 | ||
15 | ---- | |
16 | # pvs | |
17 | PV VG Fmt Attr PSize PFree | |
18 | /dev/sda3 pve lvm2 a-- 7.87g 876.00m | |
19 | ||
20 | # vgs | |
21 | VG #PV #LV #SN Attr VSize VFree | |
22 | pve 1 3 0 wz--n- 7.87g 876.00m | |
23 | ---- | |
24 | ||
25 | The installer allocates three **L**ogical **V**olumes (LV) inside this | |
26 | VG: | |
27 | ||
28 | ---- | |
29 | # lvs | |
30 | LV VG Attr LSize Pool Origin Data% Meta% | |
31 | data pve twi-a-tz-- 4.38g 0.00 0.63 | |
32 | root pve -wi-ao---- 1.75g | |
33 | swap pve -wi-ao---- 896.00m | |
34 | ---- | |
35 | ||
36 | root:: Formatted as `ext4`, and contains the operation system. | |
37 | ||
38 | swap:: Swap partition | |
39 | ||
40 | data:: This volume uses LVM-thin, and is used to store VM | |
41 | images. LVM-thin is preferable for this task, because it offers | |
42 | efficient support for snapshots and clones. | |
43 | ||
44 | Hardware | |
45 | ~~~~~~~~ | |
46 | ||
47 | We highly recommend to use a hardware RAID controller (with BBU) for | |
48 | such setups. This increases performance, provides redundancy, and make | |
49 | disk replacements easier (hot-pluggable). | |
50 | ||
51 | LVM itself does not need any special hardware, and memory requirements | |
52 | are very low. | |
53 | ||
54 | ||
55 | Bootloader | |
56 | ~~~~~~~~~~ | |
57 | ||
58 | We install two boot loaders by default. The first partition contains | |
59 | the standard GRUB boot loader. The second partition is an **E**FI **S**ystem | |
60 | **P**artition (ESP), which makes it possible to boot on EFI systems. |