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[linux-lvm] SOLVED Re: moving LVMs to another machine



Ray -

Thanks VERY much for your replies.

I found after I sent my msgs to this list that the second machine automagically created its own /etc/lvm, and when I did

# vgchange -a y

everything came up great.

It's cool that the LVM config info is stored to the PVs. My compliments to the developers.

Albert

On Jan 14, 2011, at 1:56 PM, Ray Morris wrote:

>> Also, found a backup of /etc/lvm from first machine.
> 
> That metadata is (by default) stored on every PV (disk), 
> so the backup is only needed if you accidentally change 
> something and need to put it back the way it was.
> 
> 
> On Fri, 14 Jan 2011 13:41:17 -0600
> Albert Everett <aeeverett ualr edu> wrote:
> 
>> Also, found a backup of /etc/lvm from first machine. 
>> 
>> Albert
>> 
>> [root login-0-0 lvm]# ls -R
>> .:
>> archive  backup  lvm.conf
>> 
>> ./archive:
>> vg0_00000.vg  vg0_00001.vg  vg0_00002.vg  vg0_00003.vg  vg1_00000.vg
>> vg1_00001.vg
>> 
>> ./backup:
>> vg0  vg1
>> 
>> [root login-0-0 lvm]# cat backup/vg0
>> # Generated by LVM2: Tue Jan 20 12:42:14 2009
>> 
>> contents = "Text Format Volume Group"
>> version = 1
>> 
>> description = "Created *after* executing 'lvcreate -l 26772 -n
>> lv0 /dev/vg0'"
>> 
>> creation_host = "whatever"	# Linux whatever 2.6.9-55.0.2.ELsmp
>> #1 SMP Tue Jun 26 14:14:47 EDT 2007 x86_64 creation_time =
>> 1232476934	# Tue Jan 20 12:42:14 2009
>> 
>> vg0 {
>> 	id = "DlYlrX-oFu7-S3rf-GVH0-5sVp-cuQh-0VGIdy"
>> 	seqno = 4
>> 	status = ["RESIZEABLE", "READ", "WRITE"]
>> 	extent_size = 262144		# 128 Megabytes
>> 	max_lv = 0
>> 	max_pv = 0
>> 
>> 	physical_volumes {
>> 
>> 		pv0 {
>> 			id = "aX4eXc-5ADq-BTl2-sZzY-36kX-A0zx-bDKIQf"
>> 			device = "/dev/sdc1"	# Hint only
>> 
>> 			status = ["ALLOCATABLE"]
>> 			dev_size = 18446744073709551615	# 8
>> (null) pe_start = 384
>> 			pe_count = 13386	# 1.63403 Terabytes
>> 		}
>> 
>> 		pv1 {
>> 			id = "fgu78M-yzS9-OPbV-2aXt-NgJP-A6dA-ZpQCkt"
>> 			device = "/dev/sdd1"	# Hint only
>> 
>> 			status = ["ALLOCATABLE"]
>> 			dev_size = 18446744073709551615	# 8
>> (null) pe_start = 384
>> 			pe_count = 13386	# 1.63403 Terabytes
>> 		}
>> 	}
>> 
>> 	logical_volumes {
>> 
>> 		lv0 {
>> 			id = "fOvYHo-jj3e-qoZK-nvU8-7yu3-z19U-siuqOP"
>> 			status = ["READ", "WRITE", "VISIBLE"]
>> 			segment_count = 2
>> 
>> 			segment1 {
>> 				start_extent = 0
>> 				extent_count = 13386	# 1.63403
>> Terabytes
>> 
>> 				type = "striped"
>> 				stripe_count = 1	# linear
>> 
>> 				stripes = [
>> 					"pv0", 0
>> 				]
>> 			}
>> 			segment2 {
>> 				start_extent = 13386
>> 				extent_count = 13386	# 1.63403
>> Terabytes
>> 
>> 				type = "striped"
>> 				stripe_count = 1	# linear
>> 
>> 				stripes = [
>> 					"pv1", 0
>> 				]
>> 			}
>> 		}
>> 	}
>> }
>> 
>> [root login-0-0 lvm]# cat backup/vg1
>> # Generated by LVM2: Fri Jan 16 11:30:34 2009
>> 
>> contents = "Text Format Volume Group"
>> version = 1
>> 
>> description = "Created *after* executing 'lvcreate -L 4.72T -n
>> lv1 /dev/vg1'"
>> 
>> creation_host = "whatever"	# Linux whatever 2.6.9-55.0.2.ELsmp
>> #1 SMP Tue Jun 26 14:14:47 EDT 2007 x86_64 creation_time =
>> 1232127034	# Fri Jan 16 11:30:34 2009
>> 
>> vg1 {
>> 	id = "Qjb9Fq-o5Jy-MH1n-453l-gQqp-iqqN-49sUIS"
>> 	seqno = 2
>> 	status = ["RESIZEABLE", "READ", "WRITE"]
>> 	extent_size = 262144		# 128 Megabytes
>> 	max_lv = 0
>> 	max_pv = 0
>> 
>> 	physical_volumes {
>> 
>> 		pv0 {
>> 			id = "VSTyo3-r8rE-5lym-G6F7-683r-fdZm-Urm5af"
>> 			device = "/dev/sde1"	# Hint only
>> 
>> 			status = ["ALLOCATABLE"]
>> 			dev_size = 18446744073684372087	# 8
>> (null) pe_start = 384
>> 			pe_count = 16287	# 1.98816 Terabytes
>> 		}
>> 
>> 		pv1 {
>> 			id = "eXd2Ee-L55A-bO43-ucXR-GnGM-n4fo-k0vOXP"
>> 			device = "/dev/sdf1"	# Hint only
>> 
>> 			status = ["ALLOCATABLE"]
>> 			dev_size = 18446744073684372087	# 8
>> (null) pe_start = 384
>> 			pe_count = 16287	# 1.98816 Terabytes
>> 		}
>> 
>> 		pv2 {
>> 			id = "4e0pIE-AoXc-2bb5-m6Q9-Eb2z-gmHW-Gu9Owl"
>> 			device = "/dev/sdg1"	# Hint only
>> 
>> 			status = ["ALLOCATABLE"]
>> 			dev_size = 1603013832	# 764.377
>> Gigabytes pe_start = 384
>> 			pe_count = 6115	# 764.375 Gigabytes
>> 		}
>> 	}
>> 
>> 	logical_volumes {
>> 
>> 		lv1 {
>> 			id = "SNdEg6-nshz-xtzf-ml4R-jraE-ukEZ-eqK6hE"
>> 			status = ["READ", "WRITE", "VISIBLE"]
>> 			segment_count = 3
>> 
>> 			segment1 {
>> 				start_extent = 0
>> 				extent_count = 16287	# 1.98816
>> Terabytes
>> 
>> 				type = "striped"
>> 				stripe_count = 1	# linear
>> 
>> 				stripes = [
>> 					"pv0", 0
>> 				]
>> 			}
>> 			segment2 {
>> 				start_extent = 16287
>> 				extent_count = 16287	# 1.98816
>> Terabytes
>> 
>> 				type = "striped"
>> 				stripe_count = 1	# linear
>> 
>> 				stripes = [
>> 					"pv1", 0
>> 				]
>> 			}
>> 			segment3 {
>> 				start_extent = 32574
>> 				extent_count = 6093	# 761.625
>> Gigabytes
>> 
>> 				type = "striped"
>> 				stripe_count = 1	# linear
>> 
>> 				stripes = [
>> 					"pv2", 0
>> 				]
>> 			}
>> 		}
>> 	}
>> }
>> 
>> Begin forwarded message:
>> 
>>> From: Albert Everett <aeeverett ualr edu>
>>> Date: January 14, 2011 1:25:24 PM CST
>>> To: linux-lvm redhat com
>>> Subject: moving LVMs to another machine
>>> 
>>> This is my first time trying to do this, so please forgive me if
>>> what I'm asking is trivial. I'm anxious not to loose data.
>>> 
>>> I have moved a Dell MD3000 with an MD1000 attached from one CentOS
>>> 4.5 x86_64 machine to another. I've installed Dell's drivers on the
>>> second machine and I see output below. 
>>> 
>>> /dev/sdb and sdc are on the MD3000; /dev/sdd, sde and sdf are on
>>> the MD1000. Filesystem on both is ext3, and I only used LVM to
>>> concatenate <2TB volumes because the MD3000 firmware required it at
>>> the time.
>>> 
>>> I did not actively deactivate any volume groups or logical volumes
>>> before I made this move.
>>> 
>>> Q: What are my next steps after lvscan to bring the two logical
>>> volumes back online? OS, etc are all on /dev/sda; the logical
>>> volumes just have extra stuff. 
>>> 
>>> Q: Am I right to assume that once lv0 and lv1 show as active, all I
>>> need to do is mount them somewhere, and that the filesystems they
>>> contain should be intact? I had no disk or controller failures that
>>> I know of.
>>> 
>>> Albert
>>> 
>>> [root login-0-0 ~]# fdisk -l
>>> 
>>> Disk /dev/sda: 749.6 GB, 749606010880 bytes
>>> 255 heads, 63 sectors/track, 91134 cylinders
>>> Units = cylinders of 16065 * 512 = 8225280 bytes
>>> 
>>>  Device Boot      Start         End      Blocks   Id  System
>>> /dev/sda1   *           1        3060    24579418+  83  Linux
>>> /dev/sda2            3061        6120    24579450   83  Linux
>>> /dev/sda3            6121        8160    16386300   82  Linux swap
>>> /dev/sda4            8161       91134   666488655    5  Extended
>>> /dev/sda5            8161       91134   666488623+  83  Linux
>>> 
>>> Disk /dev/sdb: 1796.7 GB, 1796776919040 bytes
>>> 255 heads, 63 sectors/track, 218445 cylinders
>>> Units = cylinders of 16065 * 512 = 8225280 bytes
>>> 
>>>  Device Boot      Start         End      Blocks   Id  System
>>> /dev/sdb1               1      218445  1754659431   8e  Linux LVM
>>> 
>>> Disk /dev/sdc: 1796.7 GB, 1796776919040 bytes
>>> 255 heads, 63 sectors/track, 218445 cylinders
>>> Units = cylinders of 16065 * 512 = 8225280 bytes
>>> 
>>>  Device Boot      Start         End      Blocks   Id  System
>>> /dev/sdc1               1      218445  1754659431   8e  Linux LVM
>>> 
>>> Disk /dev/sdd: 2186.1 GB, 2186136256512 bytes
>>> 255 heads, 63 sectors/track, 265782 cylinders
>>> Units = cylinders of 16065 * 512 = 8225280 bytes
>>> 
>>>  Device Boot      Start         End      Blocks   Id  System
>>> /dev/sdd1               1      265782  2134893883+  8e  Linux LVM
>>> 
>>> Disk /dev/sde: 2186.1 GB, 2186136256512 bytes
>>> 255 heads, 63 sectors/track, 265782 cylinders
>>> Units = cylinders of 16065 * 512 = 8225280 bytes
>>> 
>>>  Device Boot      Start         End      Blocks   Id  System
>>> /dev/sde1               1      265782  2134893883+  8e  Linux LVM
>>> 
>>> Disk /dev/sdf: 820.7 GB, 820745076736 bytes
>>> 255 heads, 63 sectors/track, 99783 cylinders
>>> Units = cylinders of 16065 * 512 = 8225280 bytes
>>> 
>>>  Device Boot      Start         End      Blocks   Id  System
>>> /dev/sdf1               1       99783   801506916   8e  Linux LVM
>>> 
>>> [root login-0-0 ~]# pvscan
>>> PV /dev/sdd1   VG vg1   lvm2 [1.99 TB / 0    free]
>>> PV /dev/sde1   VG vg1   lvm2 [1.99 TB / 0    free]
>>> PV /dev/sdf1   VG vg1   lvm2 [764.38 GB / 2.75 GB free]
>>> PV /dev/sdb1   VG vg0   lvm2 [1.63 TB / 0    free]
>>> PV /dev/sdc1   VG vg0   lvm2 [1.63 TB / 0    free]
>>> Total: 5 [7.99 TB] / in use: 5 [7.99 TB] / in no VG: 0 [0   ]
>>> 
>>> [root login-0-0 ~]# vgscan
>>> Reading all physical volumes.  This may take a while...
>>> Found volume group "vg1" using metadata type lvm2
>>> Found volume group "vg0" using metadata type lvm2
>>> 
>>> [root login-0-0 ~]# lvscan
>>> inactive          '/dev/vg1/lv1' [4.72 TB] inherit
>>> inactive          '/dev/vg0/lv0' [3.27 TB] inherit
>>> 
>>> [root login-0-0 ~]# pvdisplay
>>> --- Physical volume ---
>>> PV Name               /dev/sdd1
>>> VG Name               vg1
>>> PV Size               8192.00 EB / not usable 8192.00 EB
>>> Allocatable           yes (but full)
>>> PE Size (KByte)       131072
>>> Total PE              16287
>>> Free PE               0
>>> Allocated PE          16287
>>> PV UUID               VSTyo3-r8rE-5lym-G6F7-683r-fdZm-Urm5af
>>> 
>>> --- Physical volume ---
>>> PV Name               /dev/sde1
>>> VG Name               vg1
>>> PV Size               8192.00 EB / not usable 8192.00 EB
>>> Allocatable           yes (but full)
>>> PE Size (KByte)       131072
>>> Total PE              16287
>>> Free PE               0
>>> Allocated PE          16287
>>> PV UUID               eXd2Ee-L55A-bO43-ucXR-GnGM-n4fo-k0vOXP
>>> 
>>> --- Physical volume ---
>>> PV Name               /dev/sdf1
>>> VG Name               vg1
>>> PV Size               764.38 GB / not usable 1.60 MB
>>> Allocatable           yes 
>>> PE Size (KByte)       131072
>>> Total PE              6115
>>> Free PE               22
>>> Allocated PE          6093
>>> PV UUID               4e0pIE-AoXc-2bb5-m6Q9-Eb2z-gmHW-Gu9Owl
>>> 
>>> --- Physical volume ---
>>> PV Name               /dev/sdb1
>>> VG Name               vg0
>>> PV Size               8192.00 EB / not usable 8192.00 EB
>>> Allocatable           yes (but full)
>>> PE Size (KByte)       131072
>>> Total PE              13386
>>> Free PE               0
>>> Allocated PE          13386
>>> PV UUID               aX4eXc-5ADq-BTl2-sZzY-36kX-A0zx-bDKIQf
>>> 
>>> --- Physical volume ---
>>> PV Name               /dev/sdc1
>>> VG Name               vg0
>>> PV Size               8192.00 EB / not usable 8192.00 EB
>>> Allocatable           yes (but full)
>>> PE Size (KByte)       131072
>>> Total PE              13386
>>> Free PE               0
>>> Allocated PE          13386
>>> PV UUID               fgu78M-yzS9-OPbV-2aXt-NgJP-A6dA-ZpQCkt
>>> 
>>> [root login-0-0 ~]# vgdisplay
>>> --- Volume group ---
>>> VG Name               vg1
>>> System ID             
>>> Format                lvm2
>>> Metadata Areas        3
>>> Metadata Sequence No  2
>>> VG Access             read/write
>>> VG Status             resizable
>>> MAX LV                0
>>> Cur LV                1
>>> Open LV               0
>>> Max PV                0
>>> Cur PV                3
>>> Act PV                3
>>> VG Size               4.72 TB
>>> PE Size               128.00 MB
>>> Total PE              38689
>>> Alloc PE / Size       38667 / 4.72 TB
>>> Free  PE / Size       22 / 2.75 GB
>>> VG UUID               Qjb9Fq-o5Jy-MH1n-453l-gQqp-iqqN-49sUIS
>>> 
>>> --- Volume group ---
>>> VG Name               vg0
>>> System ID             
>>> Format                lvm2
>>> Metadata Areas        2
>>> Metadata Sequence No  4
>>> VG Access             read/write
>>> VG Status             resizable
>>> MAX LV                0
>>> Cur LV                1
>>> Open LV               0
>>> Max PV                0
>>> Cur PV                2
>>> Act PV                2
>>> VG Size               3.27 TB
>>> PE Size               128.00 MB
>>> Total PE              26772
>>> Alloc PE / Size       26772 / 3.27 TB
>>> Free  PE / Size       0 / 0   
>>> VG UUID               DlYlrX-oFu7-S3rf-GVH0-5sVp-cuQh-0VGIdy
>>> 
>>> [root login-0-0 ~]# lvdisplay
>>> --- Logical volume ---
>>> LV Name                /dev/vg1/lv1
>>> VG Name                vg1
>>> LV UUID                SNdEg6-nshz-xtzf-ml4R-jraE-ukEZ-eqK6hE
>>> LV Write Access        read/write
>>> LV Status              NOT available
>>> LV Size                4.72 TB
>>> Current LE             38667
>>> Segments               3
>>> Allocation             inherit
>>> Read ahead sectors     0
>>> 
>>> --- Logical volume ---
>>> LV Name                /dev/vg0/lv0
>>> VG Name                vg0
>>> LV UUID                fOvYHo-jj3e-qoZK-nvU8-7yu3-z19U-siuqOP
>>> LV Write Access        read/write
>>> LV Status              NOT available
>>> LV Size                3.27 TB
>>> Current LE             26772
>>> Segments               2
>>> Allocation             inherit
>>> Read ahead sectors     0
>>> 
>> 
>> 
>> _______________________________________________
>> linux-lvm mailing list
>> linux-lvm redhat com
>> https://www.redhat.com/mailman/listinfo/linux-lvm
>> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>> 
> 
> 
> 
> -- 
> 
> Ray Morris
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