local-lvm.adoc

   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.