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Disco
Asked: 2011-01-27 04:07:01 +0800 CST

How to expand LVM group by adding new physical device

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I'm having space issues on one server; the disk layout is setup so root device is on a volume group:

#vgscan
Found volume group "VolGroup00" using metadata type lvm2

#pvscan
PV /dev/xvdb1   VG lvm          lvm2 [322.26 GB / 107.26 GB free]
PV /dev/xvda2   VG VolGroup00   lvm2 [29.19 GB / 0    free]
Total: 2 [351.45 GB] / in use: 2 [351.45 GB] / in no VG: 0 [0   ]

#lvscan
ACTIVE '/dev/VolGroup00/LogVol00' [27.16 GB] inherit (my root)
ACTIVE '/dev/VolGroup00/LogVol01' [2.03 GB] inherit  (swap)

As you see, no space left on LogVol01. I'm looking for a 'quick' way to add more space I can add new physical device but don't know how to tell LVM to add this to the group.

Do I need to restart and boot livecd in order to do this operation ?

(This server is running in production and i really need to figure out what to do)

thank you for your answers,

ubuntu lvm

2 Answers

  1. Best Answer

    You can add a physical volume to an existing volume group with the command
    vgextend VolGroup00 /dev/drive_name

    Stretching out an existing logical volume over the new physical volume requires lvextend. I recommend reading this page, there are many things to consider when extending a logical volume.

    After extending the logical volume you can resize the partition with resize2fs, but be sure to check it for errors first using fsck.

    In this case the filesystem is the root filesystem, so a filesystem check can't be performed without rebooting. Creating a file in the root called forcefsck will make sure that fsck is run at the next boot. touch /forcefsck

    Source: the tldp pages on LVM, specifically the pages on vgextend , and lvextend.
    These documentation pages are an excellent source of information on LVM.

    * this post was heavily edited based on the comments.

    • 6

  2. Remove the new PV from the new VG, add it to the existing VG, and expand the LV and FS.

    • 2