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Date: Wed, 03 Oct 2007 20:31:28 +0200
From: Hannes Dorbath <light@theendofthetunnel.de>
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Subject: Re: [linux-lvm] Where to report bugs?
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To: LVM general discussion and development <linux-lvm@redhat.com>

Alasdair G Kergon wrote:
> If you want to use bugzilla rather than this mailing list, file bugs that
> you find in upstream CVS against:
> 
>   Product Fedora
>   Version devel
>   Component lvm2

OK, if this ML is fine as well, I'll post it here:

Summary is that an active snapshot LV that loses its COW PV and is in
the same VG as the origin LV makes the origin LV disappear.

Example:
1. Create 2 PVs. Let's say /dev/sda and /dev/sdb
2. Create a VG with PV /dev/sda named data
3. Create a LV on VG data named origin
4. Extend VG data with PV /dev/sdb
5. Create a snapshot LV of LV origin, in VG data, on PV /dev/sdb, named snap
6. Remove /dev/sdb physically from the system (or disable in BIOS)
7. Reboot
8. Use vgreduce --removemissing to get VG data up again

LV origin is gone and can only be brought back from backup with
vgcfgrestore.

lvm 2.02.28
dev-mapper 1.02.22-r1
kernel 2.6.22-r8


-- 
Best regards,
Hannes Dorbath