Mapping large file across physical extents

[Ray H. Gay]

Is there a convenient way to see what extents a large file is occupying?

[Steven Sim Kok Leong]

Hi,

No.

You can only identify the physical extents used by the filesystem where the large file resides. This is performed by performing an lvdisplay on the logical volume that the filesystem sits on top of.

Hope this helps. Regards.

Steven Sim Kok Leong
Brainbench MVP for Unix Admin
http://www.brainbench.com

[Roger Baptiste]

hi,

I don''t think it is possible. The best you can do is to see which PV extents your Filesystem is occupying.
(using lvdisplay -v)

You can also run pvdisplay -v on PVs to see what filesystem is contains and how it is distributed.

HTh
raj

[Wodisch]

Hello Ray,

not a convenient way, at least :-(

You'll need a mixture of "fsdb" on the i-node and file-system of that file, "lvdisplay -v" on its LV, and "ioscan" on its PV. In case of a RAID-box you then need a mapping from LUN to *real* har-disk inside the RAID-box, too...

It would be pretty difficult to write a script doing this, I guess.

Just my $0.02,
Wodisch

[fg_1]

Ray

unfortunately you cannot do this, only at the lvol level with the lvdisplay -v command.

The file should be using the extents evenly, what indications are you receiving that there is a problem here?