[linux-lvm] pvscan and vgscan

Heinz J . Mauelshagen mauelshagen at sistina.com
Fri Apr 25 04:03:01 UTC 2003

On Thu, Apr 24, 2003 at 11:16:07AM -0700, Rich Turner wrote:
> how does pvscan and vgscan know what devices to scan to search for pv's
> and vg's? is there a file that it uses to determine which disks to open?
> it does not appear to try to open all devices when their respective
> modules have not been loaded yet.

LVM1 has the tradeoff that all supported devices are hard-coded which we
changed in LVM2 to be configurable (using regular expressions).

> my situation is that i have volume groups on multiple scsi devices but
> the scsi modules are not being loaded before vgscan is being run in the
> rc.sysinit. i realize that this is a problem inherent with the
> rc.sysinit and can be fixed within it. but, my question is how does
> vgscan scan all devices without opening them? normally when a device is
> opened all of the modules are automatically loaded, hence vgscan will
> find them.

It does open them. You likely have a kmod misconfiguration preventing
module load if it fails to.
> using lvm 1.0.3
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/


Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***


Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
Mauelshagen at Sistina.com                           +49 2626 141200
                                                       FAX 924446

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