projects / pve-docs.git / blame
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|---|---|---|
| 08152ae6 DM |
1 | Logical Volume Manager (LVM) |
| 2 | ---------------------------- | |
| 5f09af76 DM |
3 | ifdef::wiki[] |
| 4 | :pve-toplevel: | |
| 5 | endif::wiki[] | |
| 6 | ||
| 08152ae6 | 7 | Most people install {pve} directly on a local disk. The {pve} |
| 8b849dc3 DM |
8 | installation CD offers several options for local disk management, and |
| 9 | the current default setup uses LVM. The installer let you select a | |
| 10 | single disk for such setup, and uses that disk as physical volume for | |
| 8c1189b6 | 11 | the **V**olume **G**roup (VG) `pve`. The following output is from a |
| 8b849dc3 | 12 | test installation using a small 8GB disk: |
| 08152ae6 | 13 | |
| 8b849dc3 DM |
14 | ---- |
| 15 | # pvs | |
| 16 | PV VG Fmt Attr PSize PFree | |
| 17 | /dev/sda3 pve lvm2 a-- 7.87g 876.00m | |
| 18 | ||
| 19 | # vgs | |
| 20 | VG #PV #LV #SN Attr VSize VFree | |
| 21 | pve 1 3 0 wz--n- 7.87g 876.00m | |
| 22 | ---- | |
| 23 | ||
| 24 | The installer allocates three **L**ogical **V**olumes (LV) inside this | |
| 25 | VG: | |
| 26 | ||
| 27 | ---- | |
| 28 | # lvs | |
| 29 | LV VG Attr LSize Pool Origin Data% Meta% | |
| 30 | data pve twi-a-tz-- 4.38g 0.00 0.63 | |
| 31 | root pve -wi-ao---- 1.75g | |
| 32 | swap pve -wi-ao---- 896.00m | |
| 33 | ---- | |
| 34 | ||
| 8c1189b6 | 35 | root:: Formatted as `ext4`, and contains the operation system. |
| 8b849dc3 DM |
36 | |
| 37 | swap:: Swap partition | |
| 38 | ||
| 39 | data:: This volume uses LVM-thin, and is used to store VM | |
| 40 | images. LVM-thin is preferable for this task, because it offers | |
| 41 | efficient support for snapshots and clones. | |
| 08152ae6 | 42 | |
| d822a869 DM |
43 | Hardware |
| 44 | ~~~~~~~~ | |
| 45 | ||
| 46 | We highly recommend to use a hardware RAID controller (with BBU) for | |
| 47 | such setups. This increases performance, provides redundancy, and make | |
| 48 | disk replacements easier (hot-pluggable). | |
| 49 | ||
| 50 | LVM itself does not need any special hardware, and memory requirements | |
| 51 | are very low. | |
| 52 | ||
| 53 | ||
| 54 | Bootloader | |
| 55 | ~~~~~~~~~~ | |
| 56 | ||
| 57 | We install two boot loaders by default. The first partition contains | |
| 58 | the standard GRUB boot loader. The second partition is an **E**FI **S**ystem | |
| 59 | **P**artition (ESP), which makes it possible to boot on EFI systems. |