[ale] ISCSI

[Asher Vilensky]

I would think another option might be:

If you have enough free PE's:
- Create a new LV with the config you want.
- Copy/move the data from the old LV into it.
- Remove the old LV.

If you don't have free PE's, but have alternate space elsewhere:
- Backup/copy all data from the LV to a safe location.
- Remove the LV.
- Create a new LV with the config you want.
- Copy the data back into it (after the mount).

I'm pretty sure you already thought of that since this is pretty simple and
straight forward, so I must be missing something.

-- Asher


On Fri, Sep 25, 2009 at 8:19 PM, Brian Pitts <brian at polibyte.com> wrote:

> On 09/25/2009 05:25 PM, Brandon Colbert wrote:
>
> >
> > My other question is how do I completely wipe all LVM configuration?
> >
>
> Take a look at
>
>
> https://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5.4/html/Logical_Volume_Manager_Administration/LVM_components.html
>
> "The underlying physical storage unit of an LVM logical volume is a
> block device such as a partition or whole disk. To use the device for an
> LVM logical volume the device must be initialized as a physical volume
> (PV). Initializing a block device as a physical volume places a label
> near the start of the device.
>
> By default, the LVM label is placed in the second 512-byte sector. You
> can overwrite this default by placing the label on any of the first 4
> sectors. This allows LVM volumes to co-exist with other users of these
> sectors, if necessary.
>
> An LVM label provides correct identification and device ordering for a
> physical device, since devices can come up in any order when the system
> is booted. An LVM label remains persistent across reboots and throughout
> a cluster.
>
> The LVM label identifies the device as an LVM physical volume. It
> contains a random unique identifier (the UUID) for the physical volume.
> It also stores the size of the block device in bytes, and it records
> where the LVM metadata will be stored on the device.
>
> The LVM metadata contains the configuration details of the LVM volume
> groups on your system. By default, an identical copy of the metadata is
> maintained in every metadata area in every physical volume within the
> volume group. LVM metadata is small and stored as ASCII.
>
> Currently LVM allows you to store 0, 1 or 2 identical copies of its
> metadata on each physical volume. The default is 1 copy. Once you
> configure the number of metadata copies on the physical volume, you
> cannot change that number at a later time. The first copy is stored at
> the start of the device, shortly after the label. If there is a second
> copy, it is placed at the end of the device. If you accidentally
> overwrite the area at the beginning of your disk by writing to a
> different disk than you intend, a second copy of the metadata at the end
> of the device will allow you to recover the metadata."
>
> --
> All the best,
> Brian Pitts
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