[linux-lvm] Switched Distro's. No more LVM; uuid issue

[Nathan Brown]

I was running Slackware 10.1 and I was required to switch over to
Fedora Core 4. I backed up my /etc/lvm folder because I knew I'd run
into problems. Well, I ran into problems as expected....

Just about any LVM related command will give me the error:
     "Couldn't find device with uuid 'k4Px6F-wwSG-mDY6-tne2-RNVx-G3fI-mWUw4r"
Now, according to my volume group (homevg) backup, it is refering to
my second partition in the strip: /dev/sdb1.

Here is the output from pvdisplay.

# pvdisplay /dev/hdc4
pvdisplay  Warning: Volume group homevg is not consistent
pvdisplay  --- Physical volume ---
pvdisplay  PV Name               /dev/sdc4
pvdisplay  VG Name               homevg
pvdisplay  PV Size               92.11 GB / not usable 0
pvdisplay  Allocatable           yes (but full)
pvdisplay  PE Size (KByte)       4096
pvdisplay  Total PE              23581
pvdisplay  Free PE               0
pvdisplay  Allocated PE          23581
pvdisplay  PV UUID               F0YSMA-brB8-gQOJ-qqV9-Lxzf-lnUe-sLgRCd

# pvdisplay /dev/hdb1   *THIS IS THE DEVICE IN QUESTION*
[...]
pvdisplay    Using physical volume(s) on command line
pvdisplay        Opened /dev/sdb1 RO
pvdisplay        /dev/sdb1: block size is 1024 bytes
pvdisplay      /dev/sdb1: lvm1 label detected
pvdisplay        Closed /dev/sdb1
pvdisplay        lvmcache: /dev/sdb1 now in VG homevg
pvdisplay      Reading physical volume data /dev/sdb1 from disk
pvdisplay        Opened /dev/sdb1 RO
pvdisplay        /dev/sdb1: block size is 1024 bytes
pvdisplay      Found /dev/sdb1 in VG homevg
pvdisplay        Closed /dev/sdb1
pvdisplay  --- Physical volume ---
pvdisplay  PV Name               /dev/sdb1
pvdisplay  VG Name               homevg
pvdisplay  PV Size               111.79 GB / not usable 38.94 MB
pvdisplay  Allocatable           yes (but full)
pvdisplay  PE Size (KByte)       32768
pvdisplay  Total PE              3576
pvdisplay  Free PE               0
pvdisplay  Allocated PE          3576
pvdisplay  PV UUID               kGdagE-JBqu-WX3Z-sdm1-rJlv-FMS3-HbZ6r5
pvdisplay
pvdisplay      Dumping persistent device cache to /etc/lvm/.cache
pvdisplay    Wiping internal VG cache

# pvdisplay /dev/sda1
pvdisplay  Warning: Volume group homevg is not consistent
pvdisplay  --- NEW Physical volume ---
pvdisplay  PV Name               /dev/sda1
pvdisplay  VG Name
pvdisplay  PV Size               186.31 GB
pvdisplay  Allocatable           NO
pvdisplay  PE Size (KByte)       0
pvdisplay  Total PE              0
pvdisplay  Free PE               0
pvdisplay  Allocated PE          0
pvdisplay  PV UUID               ytCX8B-ntz8-ORnO-GZwx-xwts-baEQ-3Cce2t

OK now that I have that out of the way, here is  my backup volume
group file I made just before reinstalling.

/etc/lvm/backup/homevg:
----------------------------------------------------------------------------------
 Generated by LVM2: Mon Sep 19 23:07:13 2005

contents = "Text Format Volume Group"
version = 1

description = "Created *after* executing 'vgcfgbackup'"

creation_host = "localhost"	# Linux localhost 2.6.7 #15 SMP Sun Sep 11
15:49:42 EDT 2005 i686
creation_time = 1127185633	# Mon Sep 19 23:07:13 2005

homevg {
	id = "HdvlZ1-G66R-V4BR-Xx4d-6ghu-eejx-tWJmt6"
	seqno = 11
	status = ["RESIZEABLE", "READ", "WRITE"]
	extent_size = 8192		# 4 Megabytes
	max_lv = 0
	max_pv = 0

	physical_volumes {

		pv0 {
			id = "F0YSMA-brB8-gQOJ-qqV9-Lxzf-lnUe-sLgRCd"
			device = "/dev/hdg4"	# Hint only

			status = ["ALLOCATABLE"]
			pe_start = 384
			pe_count = 23581	# 92.1133 Gigabytes
		}

		pv1 {
			id = "k4Px6F-wwSG-mDY6-tne2-RNVx-G3fI-mWUw4r"
			device = "/dev/hde"	# Hint only

			status = ["ALLOCATABLE"]
			pe_start = 384
			pe_count = 28618	# 111.789 Gigabytes
		}

		pv2 {
			id = "ytCX8B-ntz8-ORnO-GZwx-xwts-baEQ-3Cce2t"
			device = "/dev/sdb1"	# Hint only

			status = ["ALLOCATABLE"]
			pe_start = 384
			pe_count = 47694	# 186.305 Gigabytes
		}
	}

	logical_volumes {

		homelv {
			id = "tNfaTb-xv86-a2IF-VqKZ-sfn6-MSEv-F4RcdP"
			status = ["READ", "WRITE", "VISIBLE"]
			segment_count = 3

			segment1 {
				start_extent = 0
				extent_count = 23581	# 92.1133 Gigabytes

				type = "striped"
				stripe_count = 1	# linear

				stripes = [
					"pv0", 0
				]
			}
			segment2 {
				start_extent = 23581
				extent_count = 28618	# 111.789 Gigabytes

				type = "striped"
				stripe_count = 1	# linear

				stripes = [
					"pv1", 0
				]
			}
			segment3 {
				start_extent = 52199
				extent_count = 46575	# 181.934 Gigabytes

				type = "striped"
				stripe_count = 1	# linear

				stripes = [
					"pv2", 0
				]
			}
		}
	}
}
-----------------------------------------------------------------------------------------------------

FINALLY:

Notice the UUID for PV2. Thats the UUID that LVM is complaining about,
but according to pvdisplay, that UUID doesnt exist.

What do I do!?


-- Nathan Brown