Restore lvm after destroying boot disk

Discussion in 'Technical' started by Bitsofme, Jun 7, 2012.

  1. Bitsofme

    Bitsofme New Member

    Hi All,

    I need to restore my lvm after destroying my boot disk during an upgrade.

    I have used the information on this http://www.howtoforge.com/recover_data_from_raid_lvm_partitions
    as a starting point and have got so far but got stuck.

    I do not have a raid just three disks linked into a volume group so I skipped the first part and started at the Recovering The LVM Setup section.

    I used the dd command (also piped the output into strings to clean it up) and created this config file
    Code:
    # Generated by LVM2 version 2.02.95(2) (2012-03-06): Mon Jun  4 17:01:30 2012
    
    contents = "Text Format Volume Group"
    version = 1
    
    description = ""
    
    creation_host = "(none)"	# Linux (none) 3.3.4-5.fc17.x86_64 #1 SMP Mon May 7 17:29:34 UTC 2012 x86_64
    creation_time = 1338829290	# Mon Jun  4 17:01:30 2012
    
    vg_big {
    	id = "OBZT6E-tzAO-v80A-kN38-R1Uo-3GRI-dXd4wj"
    	seqno = 13
    	format = "lvm2" # informational
    	status = ["RESIZEABLE", "READ", "WRITE"]
    	flags = []
    	extent_size = 8192
    	max_lv = 256
    	max_pv = 256
    	metadata_copies = 0
    
    	physical_volumes {
    
    		pv0 {
    			id = "PCNHHY-LSvJ-jKbt-TXbN-tceZ-0GPe-tshRED"
    			device = "/dev/sdb"
    
    			status = ["ALLOCATABLE"]
    			flags = []
    			dev_size = 3907029168
    			pe_start = 384
    			pe_count = 476932
    		}
    
    		pv1 {
    			id = "h8j1UC-Uckf-Ob3w-UTea-nUfT-JPWc-sVdjeF"
    			device = "/dev/sdc"
    
    			status = ["ALLOCATABLE"]
    			flags = []
    			dev_size = 3907029168
    			pe_start = 384
    			pe_count = 476932
    		}
    
    		pv2 {
    			id = "Ixsun3-rGKx-0xWB-tqFK-RDYq-OuNR-qIj5sO"
    			device = "/dev/sda"
    
    			status = ["ALLOCATABLE"]
    			flags = []
    			dev_size = 3907029168
    			pe_start = 2048
    			pe_count = 476932
    		}
    	}
    
    	logical_volumes {
    
    		big	{
    			id = "ptLLIA-nQhQ-JsBQ-wur0-fejd-wV4E-Xj1PyR"
    			status = ["READ", "WRITE", "VISIBLE"]
    			flags = []
    			segment_count = 1
    
    			segment1 {
    				start_extent = 0
    				extent_count = 953864
    
    				type = "striped"
    				stripe_count = 1
    				stripe_size = 8
    
    				stripes = [
    					"pv0", 0,
    					"pv2", 0
    				]
    			}
    		}
    	}
    }
    
    In the stripes part it lists only two pv's PV0 and PV2 is this correct?

    I tried vgconfigrestore with the -t for test and got

    Test mode: Metadata will NOT be updated and volumes will not be (de)activated.
    Couldn't find device with uuid PCNHHY-LSvJ-jKbt-TXbN-tceZ-0GPe-tshRED.
    Couldn't find device with uuid Ixsun3-rGKx-0xWB-tqFK-RDYq-OuNR-qIj5sO.
    Segment with extent 953864 in PV unknown device not found
    Couldn't read all logical volumes for volume group vg_big.
    Restore failed.

    I am guessing that I need to assign uuids to the disks to match the old config?

    Any ideas?

    Thanks

    I have attached the output from the dd command after it has been cleaned with strings
     

    Attached Files:

  2. Bitsofme

    Bitsofme New Member

    More info

    Just some more info about the problem

    lvmdiskscan
    /dev/sda [ 1.82 TiB]
    /dev/vg_main/lv_swap [ 13.72 GiB]
    /dev/vg_main/lv_root [ 50.00 GiB]
    /dev/vg_main/lv_home [ 84.81 GiB]
    /dev/sdb [ 1.82 TiB]
    /dev/sdc [ 1.82 TiB] LVM physical volume
    /dev/sdd1 [ 500.00 MiB]
    /dev/sdd2 [ 148.56 GiB] LVM physical volume
    5 disks
    1 partition
    1 LVM physical volume whole disk
    1 LVM physical volume



    [[email protected] uuid_fixer]# fdisk -l

    Disk /dev/sda: 2000.4 GB, 2000398934016 bytes
    255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes


    Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes
    255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes


    Disk /dev/sdc: 2000.4 GB, 2000398934016 bytes
    255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x2c33c642

    Device Boot Start End Blocks Id System

    Disk /dev/sdd: 160.0 GB, 160040803840 bytes
    255 heads, 63 sectors/track, 19457 cylinders, total 312579695 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x000dd6fd

    Device Boot Start End Blocks Id System
    /dev/sdd1 * 2048 1026047 512000 83 Linux
    /dev/sdd2 1026048 312578047 155776000 8e Linux LVM

    Disk /dev/mapper/vg_main-lv_swap: 14.7 GB, 14730395648 bytes
    255 heads, 63 sectors/track, 1790 cylinders, total 28770304 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes


    Disk /dev/mapper/vg_main-lv_root: 53.7 GB, 53687091200 bytes
    255 heads, 63 sectors/track, 6527 cylinders, total 104857600 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes


    Disk /dev/mapper/vg_main-lv_home: 91.1 GB, 91066728448 bytes
    255 heads, 63 sectors/track, 11071 cylinders, total 177864704 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
     

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