Re: df, lvm and 6TB arrays oh my!

On Sat, 2006-02-11 at 11:26 -0500, Mark Haney wrote:
I am having a problem with df reporting the wrong disk size on a couple
of 7TB arrays on a Fedora box we are using. I have an lvm group on each
array of 6.36TB when I run df this is what I get:

/dev/mapper/Volume02-Volume02lv
2.4T 33M 2.3T 1% /mnt/arrays/array2
/dev/mapper/Volume03-Volume03lv
2.4T 950G 1.3T 43% /mnt/arrays/array1


When I run vg display this is what it reports:

pvdisplay PV Name /dev/sdd
pvdisplay VG Name Volume03
pvdisplay PV Size 6.36 TB / not usable 6.00 TB
pvdisplay Allocatable yes (but full)
pvdisplay PE Size (KByte) 4096
pvdisplay Total PE 1666397
pvdisplay Free PE 0
pvdisplay Allocated PE 1666397
pvdisplay PV UUID UlaSJI-9Srm-e3AW-LdNW-g2HG-v6ZE-4yWwPw
pvdisplay
pvdisplay --- Physical volume ---
pvdisplay PV Name /dev/sdc
pvdisplay VG Name Volume02
pvdisplay PV Size 6.36 TB / not usable 6.00 TB
pvdisplay Allocatable yes (but full)
pvdisplay PE Size (KByte) 4096
pvdisplay Total PE 1666397
pvdisplay Free PE 0
pvdisplay Allocated PE 1666397
pvdisplay PV UUID mK7WWj-UV0p-N6Qc-zhx6-EK3J-g0CO-g65ljs


I've looked around for a lvm tool to display the correct sizes, but
can't find one. Is there something I'm missing?



Not sure why you are using LVM if you are going to entirely allocate the
VG, might as well just use the partition directly....

First problem. Given the PE Size of 4MiB, you might be hitting a limit
on how much of the PV can be used. You probably should have bumped up
the PE Size when you created the VG.... Take a look at the man page for
vgcreate (no it can't be changed after the fact), but this may identify
the "not usable" phrase you are seeing.

pvdisplay has nothing to do with the filesystems, supplying that means
nothing.

Now lvdisplay will show you the size of the underlying logical volume
(Virtual partition). df is showing you the size of the filesystem laid
on top of that logical volume. You haven't told us what Fedora version
you are running, but, yes, I would be concerned about it reporting
2TiB.... Showing us lvdisplay output and tune2fs output could probably
tell someone more....

--Rob

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Relevant Pages

  • Re: df, lvm and 6TB arrays oh my!
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  • df, lvm and 6TB arrays oh my!
    ... I am having a problem with df reporting the wrong disk size on a couple of 7TB arrays on a Fedora box we are using. ... pvdisplay PE Size 4096 ...
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