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needsleep 06-23-2011 04:41 PM

How to list filesystems that are using LVM logical volumes? Centos 5.6
 
Hello,
I've read the first 40% of the RHEL 5 Logical Volume Manager Administrator's Guide, but still have one outstanding, burning question.

During the installation of Centos 5.6, I set up LVM physical volumes, volume groups and logical volumes. I can list these using pvdisplay, vgdisplay and lvdisplay commands.

How would I list what filesystems I have that are using my logical volumes?

Thanks!

chrism01 06-23-2011 05:39 PM

Code:

cat /etc/fstab
You might also find this useful http://www.linuxtopia.org/online_boo...ion/index.html

At the more physical level
Code:

fdisk - l
that's a lowercase L option. A pv partition should be type 8e.

needsleep 06-23-2011 11:53 PM

Thanks for the information Chris.

OK, so I actually already ran
cat /etc/fstab
(sorry about not telling you), and it lists these ext3 filesystems:
/dev/vg_system/LogVol00 / ext3
LABEL=/boot1 /boot ext3

And, I had run fdisk -l as well.

I didn't have any clue, however, that fstab would show me logical volumes and fdisk -l would show me physical volumes. Well, I **did** see "LogVol00" in that one line, but I couldn't from that information alone deduce, "this command shows logical volumes, this other command shows physical volumes".

fdisk -l shows disk geometry for both of my hard drives: /dev/hda and /dev/hdb. It also lists the following partitions for hda:
Device (boot) (start, end blocks), #_of_Blocks, ID, System
/dev/hda1 (boot) ---, ---, ---, 83, Linux
/dev/hda2 ---, ---, ---, 8e, Linux LVM
/dev/hda3 ---, ---, ---, 82, Linux swap

I have chosen not to list start/end blocks and #_of_Blocks columns.
And yes indeed, I see how ID 8e is appearing for Linux LVM...very interesting!

So to answer my original question with the above information,
I have one physical volume, hda2 (partition 2 of hda with ID 8e).
This makes up one volume group, vg_system.
Out of this volume group is carved 1 logical volume, LogVol00 that has a mount point of root(/).

This has been very instructive, and I thank you kindly, Chris, for your insight.


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