Your SlideShare is downloading. ×
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Logical Volume Manager. An Introduction
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Logical Volume Manager. An Introduction

3,942

Published on

Introduction to LVM and how it is related with other modules like LUKS.

Introduction to LVM and how it is related with other modules like LUKS.

Published in: Technology
1 Comment
0 Likes
Statistics
Notes
  • Be the first to like this

No Downloads
Views
Total Views
3,942
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
239
Comments
1
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Logical Volume Manager
      • An Introduction
  • 2. Logical Volume Manager What is?
    • LVM (Logical Volume Manager) allows to manage disks in a different way: creates one or more virtual disks with virtual partitions, from physical partitions
    • No limited by physical disk
  • 3. Logical Volume Manager What is?
    • LVM (Logical Volume Manager) allows to manage disks in a different way: creates one or more virtual disks with virtual partitions, from physical partitions
    • No limited by physical disk
  • 4. Logical Volume Manager Concepts
    • Physical Volume (PV) : physical partition from real disk
    • Volume Group (VG) : like a virtual disk
    • Logical Volume (LV) : a partition in a Volume Group
    • Physical Extent (PE) : like a 'cluster' in PV
    • Logical Extent (LE) : like a 'cluster' in LV
  • 5. Logical Volume Manager Concepts
    • Create one or more VG from one or more PV, and then create LVs in each VG
    VG /dev/sda1 /dev/vg/lv1 /dev/sda2 /dev/vg/lv2 /dev/vg/lv3
  • 6. Logical Volume Manager PVs
    • pvcreate: creates a PV
    • pvremove: removes a PV
    • pvdisplay: shows information about a PV
    • pvscan: scan all PVs in the system
    • pvck: check a PV for errors
    (1) Create one or more partitions with fdisk, with type LVM (2) pvcreate /dev/<partition>
  • 7. Logical Volume Manager VGs
    • vgcreate: creates a VG
    • vgremove: removes a VG
    • vgextend: extend a VG with more PVs
    • vgreduce: drops PVs from a VG
    • vgdisplay: shows info about VG
    • vgscan: scan for all VGs in system
    • vgchange: change VG properties
    • vgck, vgexport, vgmerge, vgsplit, vgrename
  • 8. Logical Volume Manager VGs (1) Create one or more partitions with fdisk, with type LVM (2) pvcreate /dev/sda1 (3) pvcreate /dev/hdb2 (4) pvcreate /dev/hdc3 (5) vgcreate myvg /dev/sda1 /dev/hdb2 /dev/hdc3
  • 9. Logical Volume Manager LVs
    • lvcreate: creates a LV
    • lvremove: removes a LV
    • lvscan: scan for all LVs in a system
    • lvdisplay: shows info about a LV
    • lvrename, lvresize, lvreduce, lvchange
  • 10. Logical Volume Manager LVs (1) Create a VG (2) lvcreate -L<size> -n <name> <vg> lvcreate -L10G -n mylv myvg It creates /dev/myvg/mylv (a link to /dev/mapper/myvg-mylv ) mkfs.ext3 /dev/myvg/mylv
  • 11. Logical Volume Manager Snapshots
    • A snapshot is an image of a LV
    • Created instantly
    • Read-only / read-write (LVM2)
    lvcreate -s -L<size> -n <name> <lv> RW: lvcreate -s -L1G -n mylv-snapshot /dev/myvg/mylv RO: lvcreate -s -L1G -n mylv-snapshot -p r /dev/myvg/mylv
  • 12. Logical Volume Manager Snapshots
    • Snapshot is like a 'pointer' to the same data in original LV
    • Each time data in original LV is modified (or in snapshot if it was created as RW), a copy is done previously in exception table
    • When it becomes full it is automatically disabled
  • 13. Logical Volume Manager Uses of Snapshots
    • To test: create snapshots and then use them as the main partitions
      • If you don't like something, revert to original and drop the snapshots
    • To backup: use a snapshot to create backups
      • This way, you can continue to work while backuping is done, without a problem of having an inconsistency
    lvcreate -s -L1G -n snaproot /dev/vg/lvroot run-backup.sh /dev/vg/snaproot lvremove -f /dev/vg/snaproot
  • 14. Logical Volume Manager LVM and other technologies /dev/* /dev/mapper/* /dev/* /dev/* /dev/md0 LUKS RAID
  • 15. Logical Volume Manager LVM and other technologies /dev/* /dev/mapper/* /dev/* /dev/vg/* /dev/* /dev/* /dev/vg/* LUKS LVM
  • 16. Logical Volume Manager LVM and other technologies /dev/* /dev/vg/* /dev/vg/* LUKS LVM
  • 17. Logical Volume Manager LVM and other technologies /dev/vg/* /dev/* /dev/mapper/* LUKS LVM
  • 18. Logical Volume Manager LVM and other technologies /dev/vg/* /dev/vg/* /dev/* /dev/* LUKS LVM RAID
  • 19. Logical Volume Manager LVM and other technologies /dev/* /dev/* /dev/* /dev/vg1/* /dev/* /dev/* /dev/* /dev/vg2/* /dev/vg3/* /dev/vg3/* LUKS LUKS LVM LVM LVM
  • 20. Logical Volume Manager My Laptop /dev/sdaA tmp home swap sbox root var music /dev/sdaB /dev/sdaC LUKS VG-CRYPT VG-UNCRYPT
  • 21. Logical Volume Manager The End That's all, folks!

×