[linux-lvm] which volume is a file on?

[linux-lvm] which volume is a file on?

[Zarthan South]

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Is there a utility or a simple way to determine which volume a file is
located on.

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Re: [linux-lvm] which volume is a file on?

[Bryn M. Reeves]

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Zarthan South wrote:
> Is there a utility or a simple way to determine which volume a file is located on.

That's more of a file system question than an LVM question and it's no
different than any other type of device: find the mount point of the
file system containing the file and then consult /proc/mounts or the
output of the mount command to determine what LV the file is on.

If you want to know where the data blocks are located physically you'll
need to do a bit more work: find the inode location, determine what
block ranges are allocated to it and then figure out how they map to
physical device regions using e.g. lvdisplay --maps. The details for
this step depend on the file system type you are using. For ext2/3 you
can determine the physical location of a file's data blocks using degbugfs.

Regards,
Bryn.

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Re: [linux-lvm] which volume is a file on?

[Zarthan South]

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Thanks
I was starting to write some scripts and thought if there was a tool to
determine which LV a file was on it would eliminate a some writing.

On Wed, Jun 11, 2008 at 3:33 AM, Bryn M. Reeves <breeves@redhat.com> wrote:

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> Zarthan South wrote:
> > Is there a utility or a simple way to determine which volume a file is
> located on.
>
> That's more of a file system question than an LVM question and it's no
> different than any other type of device: find the mount point of the
> file system containing the file and then consult /proc/mounts or the
> output of the mount command to determine what LV the file is on.
>
> If you want to know where the data blocks are located physically you'll
> need to do a bit more work: find the inode location, determine what
> block ranges are allocated to it and then figure out how they map to
> physical device regions using e.g. lvdisplay --maps. The details for
> this step depend on the file system type you are using. For ext2/3 you
> can determine the physical location of a file's data blocks using degbugfs.
>
> Regards,
> Bryn.
>
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