[linux-lvm] What is the use of thin snapshots if the external origin cannot be set to writable ?

[Sreyan Chakravarty]

I am looking into thin snapshots since the older COW snapshots delay my
boot enormously.

My normal root fs is on a normal "non-thin" volume.

So to make a snapshot I have boot into a live cd environment then set my
root fs volume to read-only and then set it to inactive.

Commands:

       sudo lvchange -pr vgfedora/fedora
       sudo lvchange -an vgfedora/fedora

Now I create the thin snapshot using lvcreate, after that I need to restore
my root LVS to its original state:

     sudo lvchange -ay vgfedora/fedora

      sudo lvchange -prw vgfedora/fedora

This fails with:

            Command on LV vgfedora/fedora uses options that are invalid
with LV parameters: lv_is_external_origin.


I mean what is the point of creating a snapshot if I can't change my
original volume ?

Is there some sort of resolution ?

-- 
Regards,
Sreyan Chakravarty
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