1

I have a 120GB SSD hosting my Ubuntu installation. I have four 3TB Western Digital Disks which I would like to configure into an LVM.

If I reinstall Ubuntu at any point in the future onto the SSD or indeed change the SSD for another, is it possible for me to access the LVM partitions etc. afterwards?

2

yes, as you can verify by building a small test diskset (for example by combining a handfull of files) and accessing it lateron from another installation or even a live CD / USB stick / whatever. Don't forget to install the lvm2 package to the installation you want to use, if it isn't already present.

as root (or with sudo)

  • apt-get install lvm2
  • pvscan will show if the physical volume is detected
  • vgscan searches for the volume group
  • modprobe dm-mod to load the module
  • vgchange -ayto activate the volumes
  • lvscan should now show the logical volumes as active and mountable

see also: how to move volume group to another system

I'd also recommend to use vgfcbackup to backup the configuration info of your volume group.

  • Just tried this by booting with a USB key. I was able to access a temporary test Logical Volume. Thank you. Saved the information into a Springpad notebook. Going to keep this safe :-) – markrich May 1 '14 at 9:17
  • Additional note - upon booting a second time with the USB key, I noticed the drive was automatically recognised and available anyway. I had to drop to root because of permissions but was able to add additional items to the volume which were available to me after starting the computer normally. – markrich May 1 '14 at 9:41

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