Re: [linux-lvm] F7 will not boot after running backup w/snapshot

[Gerry Reno <greno@verizon.net>]

Gerry Reno wrote:
> Alasdair G Kergon wrote:
>> It's up to your initrd and/or initscripts whether or
>> not and how to use those facilities.
>>
>>   
> Alasdair,
>  Is it possible to define an init script that would run early enough 
> (before LVM tries to activate the volumes) so that I could vgreduce 
> the old snapshot?
>  Or does this require a new initrd?
>
I started looking at this and then found that Fedora appears to have the 
device mapper and snapshot support as modules:

/lib/modules/2.6.20-1.2952.fc6xen/kernel/drivers/md/dm-snapshot.ko
/lib/modules/2.6.20-1.2952.fc6xen/kernel/drivers/md/dm-mod.ko

So what is going to happen if you have a snapshot of root partition 
active and then a reboot happens (sound familiar?).  The kernel on 
restart can no longer read device mapper or snapshot module or root 
partition and it will panic and who knows what else will happen.  
Corruption maybe???

Gerry