[linux-lvm] Urgent, Moving disk from hdc to hdf in existing lvm

[linux-lvm] Urgent, Moving disk from hdc to hdf in existing lvm

[kalle]

Hello!

We have a problem with one of our servers thats running lvm on linux-2.4.19.
We have 4 discs in the vg, hdb, hdc, hdg and hdh.
When we booted the server this morning hdc did not get online. 
We've tried diffrent cables but there seems to be some problem with the secondary controller.
The disc gets online if we put it on the promise controller thats handeling hdg and hdh.

Is it possible to "reconfigure" the vg so that the disk that once was hdc will be hdf? Prefably without loosing data.

Unfortunately we dont have any spare box to move the disks to, so the reconfiguring has to be done with 
the old hdc disk already beeing installed as hdf.

Any comments appreciated!


/Regards Kalle

Re: [linux-lvm] Urgent, Moving disk from hdc to hdf in existing lvm

[Heinz J . Mauelshagen]

Kalle,

any configuration change schould be happily covered by "vgscan ; vgchange -ay".

vgscan figures out all PVs by UUID and groupd them together no matter to
which changed path they are attached.

Regards,
Heinz    -- The LVM Guy --


On Thu, Aug 29, 2002 at 06:19:27AM -0500, kalle@idlar.nu wrote:
> Hello!
> 
> We have a problem with one of our servers thats running lvm on linux-2.4.19.
> We have 4 discs in the vg, hdb, hdc, hdg and hdh.
> When we booted the server this morning hdc did not get online. 
> We've tried diffrent cables but there seems to be some problem with the secondary controller.
> The disc gets online if we put it on the promise controller thats handeling hdg and hdh.
> 
> Is it possible to "reconfigure" the vg so that the disk that once was hdc will be hdf? Prefably without loosing data.
> 
> Unfortunately we dont have any spare box to move the disks to, so the reconfiguring has to be done with 
> the old hdc disk already beeing installed as hdf.
> 
> Any comments appreciated!
> 
> 
> /Regards Kalle
> 
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html

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

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Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@Sistina.com                           +49 2626 141200
                                                       FAX 924446
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Re: [linux-lvm] Urgent, Moving disk from hdc to hdf in existing lvm

[William Blunn]

> Is it possible to "reconfigure" the vg so that the disk that once 
> was hdc will be hdf? Prefably without loosing data.

The position of a PV within the LVM is controlled by the metadata stored within the PV, not the device identifier.

There is no reconfiguration per se necessary.

If your startup scripts don't do vgscan, then you will need to do one of these manually.

I think it is something like:

vgchange -an
vgscan
vgchange -ay

Of course if you have put your root filesystem in LVM then you are stuffed (and I have no sympathy for anyone in this situation).

Bill

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