local-lvm.adoc

   1 Logical Volume Manager (LVM)
   2 ----------------------------
   3 ifdef::wiki[]
   4 :pve-toplevel:
   5 endif::wiki[]
   6
   7 Most people install {pve} directly on a local disk. The {pve}
   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
  11 the **V**olume **G**roup (VG) `pve`. The following output is from a
  12 test installation using a small 8GB disk:
  13
  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
  35 root:: Formatted as `ext4`, and contains the operation system.
  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.
  42
  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.