Home / server / Questions / 28592
Accepted
Signum
Asked: 2009-06-20 03:34:08 +0800 CST

Getting a textual overview of a system's LVM configuration

  • 772

We are making extensive use of the logical volume manager (LVM) on our Debian servers. But I find it hard to get a good overview on which partitions (LVM as well as native) I have mounted where, from which LV (logical volume) from which VG (volume group) and from which PV (physical volume). There are console tools like "lvdisplay -v" and "lvs" but those always just give me a partial view of everything. What I'd wish for is a textual representation something like:

Volume group "vgmain"
=======================
consists of physical volumes:
- /dev/sda1 (300 GB, 50 GB unused)
- /dev/sdb1 (300 GB, 120 GB unused)
- /dev/sdc1 (300 GB, nothing unused)

provides logical volumes:
- lvroot (EXT3 mounted on /, 4 GB, 0.5 GB free)
- lvmysql (XFS mounted on /var/lib/mysql, 8 GB used, 2 GB free)

Volume group "vghuge"
=======================
consists of physical volumes:
- /dev/sdc2 (800 GB, 250 GB unused)

provides logical volumes:
- lvhome (XFS mounted on /home, 300 GB, 90 GB free)
- lvbackup (XFS mounted on /mnt/backup, 300 GB, 20 GB free)

Just as an idea how that might look. Is there such a tool? If nothing like that exists yet I think I'll have to script something myself which queries "df", "lvdisplay", "vgdisplay" and "pvdisplay" and creates such an overview.

Thanks in advance.

linux debian lvm

4 Answers

  1. Best Answer

    This didn't take long to write.

    • 5

  2. GNU Parted can give you most of the information you need with

    parted -l

    It seems It only fails to effectively link lvm parttion to device mapper devices. I am sure they will welcome your patch. ;-)

    • 2

  3. Cheesy, but it shows everything (except where the filesystems are mounted). Save it as /usr/sbin/lvms

    #!/bin/sh
#lvms command - consolidates all LVM views into a single command
pvscan 1>/dev/null 2>/dev/null
vgscan 1>/dev/null 2>/dev/null
lvscan 1>/dev/null 2>/dev/null
echo "Available Physical Volumes - - - - - - -"
pvs
echo
echo "Active Volume Groups - - - - - - - - - -"
vgs
echo
echo "Active Logical Volumes - - - - - - - - -"
lvs

    Follow-up: Pgs (on this page) has provided a much nicer script.

    • 1

  4. No, I don't think such a script exists. Would be a pretty cool thing to script though. I might actually look into that myself, the next time I have my weekly day-of-scripting ;-)

    • 0