local-lvm.adoc

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