[linux-lvm] Inode usage on lvm volumes?

[linux-lvm] Inode usage on lvm volumes?

[Charles Marcus]

Hello,

I've googled for an hour now and cannot find an answer to this question...

I'm on gentoo linux, and when I run:

df -i

I get a list of inode usage for everything except my lvm volumes - they
show zeros all the way across:

/dev/sda3            2501856   11865 2489991    1% /
udev                  257496    4956  252540    2% /dev
/dev/sda4            8437760      11 8437749    1% /backups
/dev/mapper/vg2-home       0       0       0    -  /home
/dev/mapper/vg2-usr        0       0       0    -  /usr
/dev/mapper/vg2-var        0       0       0    -  /var

Is this normal? If so, how do I check inode usage on an lvm volume?

Thanks,

Charles

Re: [linux-lvm] Inode usage on lvm volumes?

[Luca Berra]

On Sun, Sep 06, 2009 at 01:03:33PM -0400, Charles Marcus wrote:
>Hello,
>
>I've googled for an hour now and cannot find an answer to this question...
>
>I'm on gentoo linux, and when I run:
>
>df -i
>
>I get a list of inode usage for everything except my lvm volumes - they
>show zeros all the way across:
>
>Is this normal? If so, how do I check inode usage on an lvm volume?
>
>Thanks,
>
>Charles
>
weird, df -i works on all of my boxes. (redhats and mandriva)

L.

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Re: [linux-lvm] Inode usage on lvm volumes?

[Eugene Vilensky]

> weird, df -i works on all of my boxes. (redhats and mandriva)

I'll second that.  Rhel 3/4/5 and CentOS are just fine with df -i.

Re: [linux-lvm] Inode usage on lvm volumes?

[Lars Ellenberg]

On Sun, Sep 06, 2009 at 01:03:33PM -0400, Charles Marcus wrote:
> Hello,
> 
> I've googled for an hour now and cannot find an answer to this question...
> 
> I'm on gentoo linux, and when I run:
> 
> df -i
> 
> I get a list of inode usage for everything except my lvm volumes - they
> show zeros all the way across:
> 
> /dev/sda3            2501856   11865 2489991    1% /
> udev                  257496    4956  252540    2% /dev
> /dev/sda4            8437760      11 8437749    1% /backups
> /dev/mapper/vg2-home       0       0       0    -  /home
> /dev/mapper/vg2-usr        0       0       0    -  /usr
> /dev/mapper/vg2-var        0       0       0    -  /var
> 

do a "df -T -i"
and I bet it will show that you are using ext3 for / and /backups,
tmpfs for /dev, and reiserfs for those "zero inode" volumes.

> Is this normal? If so, how do I check inode usage on an lvm volume?

In which case that is normal, yes.
Reiserfs simply puts its inodes anywhere, until there is no more space.
It does not have any notion of "total" inodes, thus there are no
"free" inodes, either.  It probably knows the number of used inodes.
But because statfs() does only provide for "total" and "free",
and leaves "used" to be calculated, there is no way to return that info.


-- 
: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

DRBD� and LINBIT� are registered trademarks of LINBIT, Austria.

Re: [linux-lvm] Inode usage on lvm volumes?

[Charles Marcus]

On 9/6/2009, Lars Ellenberg (lars.ellenberg@linbit.com) wrote:
> do a "df -T -i"
> and I bet it will show that you are using ext3 for / and /backups,
> tmpfs for /dev, and reiserfs for those "zero inode" volumes.

Ahh... yep, and especially yep (reiserfs for the zero inode volumes)...

<whew> was a little concerned that this might be indicating a serious
problem...

> Reiserfs simply puts its inodes anywhere, until there is no more space.
> It does not have any notion of "total" inodes, thus there are no
> "free" inodes, either.  It probably knows the number of used inodes.
> But because statfs() does only provide for "total" and "free",
> and leaves "used" to be calculated, there is no way to return that info.

Many thanks for the explanation... :)

-- 

Best regards,

Charles