LVMが「消える」[閉じる]

クライアントサーバーを復元しようとしています。明らかに、マシンの速度が遅くなり、再起動したときにディスクのUUIDが見つからないと主張しながらdracutで起動しました。

現在失われたLVMで実行されていた元のオペレーティングシステムはRHEL 7でした。 10Gbドライブを追加し、新しいドライブにCentOS 7をインストールして、問題を解決するためのライブシステムを入手しました。

「当然」バックアップはありません...

#pvs -a
PV         VG Fmt Attr PSize PFree
/dev/sda1         ---     0     0
/dev/sda2         ---     0     0
/dev/sdb1         ---     0     0
/dev/sdc1         ---     0     0
/dev/sdc2         ---     0     0
/dev/sdc3         ---     0     0

/dev/sdcは新しいドライブで、sda2とsdb1を復元しようとしています。

# lsblk
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
fd0      2:0    1     4K  0 disk
sda      8:0    0   500G  0 disk
├─sda1   8:1    0   500M  0 part
└─sda2   8:2    0 499.5G  0 part
sdb      8:16   0     2T  0 disk
└─sdb1   8:17   0     2T  0 part
sdc      8:32   0    10G  0 disk
├─sdc1   8:33   0     1G  0 part /boot
├─sdc2   8:34   0     1G  0 part [SWAP]
└─sdc3   8:35   0     8G  0 part /
sr0     11:0    1  1024M  0 rom

PVScanには何も表示されません。

 # pvscan
  No matching physical volumes found

FdiskはまだLVMパーティションを報告します。

# fdisk -l

Disk /dev/sda: 536.9 GB, 536870912000 bytes, 1048576000 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 label type: dos
Disk identifier: 0x000a2e76

Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     1026047      512000   83  Linux
/dev/sda2         1026048  1048575999   523774976   8e  Linux LVM

Disk /dev/sdc: 10.7 GB, 10737418240 bytes, 20971520 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 label type: dos
Disk identifier: 0x000ddc56

Device Boot      Start         End      Blocks   Id  System
/dev/sdc1   *        2048     2099199     1048576   83  Linux
/dev/sdc2         2099200     4196351     1048576   82  Linux swap / Solaris
/dev/sdc3         4196352    20971519     8387584   83  Linux

Disk /dev/sdb: 2199.0 GB, 2199023255552 bytes, 4294967296 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 label type: dos
Disk identifier: 0xde7fc33e

Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048  4294967294  2147482623+  8e  Linux LVM

本当に心配なのは、ディスクの先頭が空のようです。

# dd if=/dev/sdb1 bs=512 count=255 skip=1
255+0 records in
255+0 records out
130560 bytes (131 kB) copied, 0.00671742 s, 19.4 MB/s

**編集：キャッシュされた更新なし** VGScan出力：

#lvmcmdline.c:2829          Parsing: vgscan -vvvv
#lvmcmdline.c:1881          Recognised command vgscan_general (id 141 / enum 127).
#config/config.c:1480        devices/global_filter not found in config: defaulting to global_filter = [ "a|.*/|" ]
#libdm-config.c:1002        global/lvmetad_update_wait_time not found in config: defaulting to 10
#daemon-client.c:33            /run/lvm/lvmetad.socket: Opening daemon socket to lvmetad for protocol lvmetad version 1.
#daemon-client.c:52            Sending daemon lvmetad: hello
#cache/lvmetad.c:143           Successfully connected to lvmetad on fd 3.
#filters/filter-sysfs.c:327           Sysfs filter initialised.
#filters/filter-internal.c:77            Internal filter initialised.
#filters/filter-type.c:56            LVM type filter initialised.
#filters/filter-usable.c:183           Usable device filter initialised.
#filters/filter-mpath.c:291           mpath filter initialised.
#filters/filter-partitioned.c:69            Partitioned filter initialised.
#filters/filter-md.c:169           MD filter initialised.
#filters/filter-composite.c:109           Composite filter initialised.
#config/config.c:1480        devices/filter not found in config: defaulting to filter = [ "a|.*/|" ]
#filters/filter-regex.c:216           Regex filter initialised.
#filters/filter-usable.c:183           Usable device filter initialised.
#filters/filter-composite.c:109           Composite filter initialised.
#libdm-config.c:975         devices/cache not found in config: defaulting to /etc/lvm/cache/.cache
#filters/filter-persistent.c:415           Persistent filter initialised.
#filters/filter-composite.c:109           Composite filter initialised.
#libdm-config.c:1074        metadata/record_lvs_history not found in config: defaulting to 0
#lvmcmdline.c:2897          DEGRADED MODE. Incomplete RAID LVs will be processed.
#lvmcmdline.c:2903          Processing command: vgscan -vvvv
#lvmcmdline.c:2904          Command pid: 10060
#lvmcmdline.c:2905          System ID:
#lvmcmdline.c:2908          O_DIRECT will be used
#locking/locking.c:129         File-based locking selected.
#libdm-common.c:984           Preparing SELinux context for /run/lock/lvm to system_u:object_r:lvm_lock_t:s0.
#libdm-common.c:987           Resetting SELinux context to default value.
#misc/lvm-flock.c:202         Locking /run/lock/lvm/P_global WB
#libdm-common.c:984           Preparing SELinux context for /run/lock/lvm/P_global to system_u:object_r:lvm_lock_t:s0.
#misc/lvm-flock.c:100           _do_flock /run/lock/lvm/P_global:aux WB
#misc/lvm-flock.c:100           _do_flock /run/lock/lvm/P_global WB
#misc/lvm-flock.c:47            _undo_flock /run/lock/lvm/P_global:aux
#libdm-common.c:987           Resetting SELinux context to default value.
#cache/lvmcache.c:2539          Dropping VG info
#cache/lvmcache.c:755           lvmcache has no info for vgname "#orphans_lvm1" with VGID #orphans_lvm1.
#cache/lvmcache.c:755           lvmcache has no info for vgname "#orphans_lvm1".
#cache/lvmcache.c:2086          lvmcache: Initialised VG #orphans_lvm1.
#cache/lvmcache.c:755           lvmcache has no info for vgname "#orphans_pool" with VGID #orphans_pool.
#cache/lvmcache.c:755           lvmcache has no info for vgname "#orphans_pool".
#cache/lvmcache.c:2086          lvmcache: Initialised VG #orphans_pool.
#cache/lvmcache.c:755           lvmcache has no info for vgname "#orphans_lvm2" with VGID #orphans_lvm2.
#cache/lvmcache.c:755           lvmcache has no info for vgname "#orphans_lvm2".
#cache/lvmcache.c:2086          lvmcache: Initialised VG #orphans_lvm2.
#cache/lvmetad.c:256           Sending lvmetad get_global_info
#label/label.c:833           Finding devices to scan
#device/dev-cache.c:1212          Creating list of system devices.
#device/dev-cache.c:723           Found dev 11:0 /dev/sr0 - new.
#device/dev-cache.c:763           Found dev 11:0 /dev/cdrom - new alias.
#device/dev-cache.c:763           Found dev 11:0 /dev/disk/by-id/ata-VMware_Virtual_SATA_CDRW_Drive_00000000000000000001 - new alias.
#device/dev-cache.c:763           Found dev 11:0 /dev/disk/by-path/pci-0000:02:01.0-ata-1.0 - new alias.
#device/dev-cache.c:723           Found dev 8:0 /dev/sda - new.
#device/dev-cache.c:763           Found dev 8:0 /dev/disk/by-path/pci-0000:03:00.0-scsi-0:0:0:0 - new alias.
#device/dev-cache.c:723           Found dev 8:1 /dev/sda1 - new.
#device/dev-cache.c:763           Found dev 8:1 /dev/disk/by-path/pci-0000:03:00.0-scsi-0:0:0:0-part1 - new alias.
#device/dev-cache.c:763           Found dev 8:1 /dev/disk/by-uuid/530982ac-2bdd-4310-857b-ff132f4a4d41 - new alias.
#device/dev-cache.c:723           Found dev 8:2 /dev/sda2 - new.
#device/dev-cache.c:763           Found dev 8:2 /dev/disk/by-path/pci-0000:03:00.0-scsi-0:0:0:0-part2 - new alias.
#device/dev-cache.c:763           Found dev 8:2 /dev/disk/by-path/pci-0000:03:00.0-scsi-0:0:0:0-part2 - new alias.
#device/dev-cache.c:723           Found dev 8:16 /dev/sdb - new.
#device/dev-cache.c:763           Found dev 8:16 /dev/disk/by-path/pci-0000:03:00.0-scsi-0:0:1:0 - new alias.
#device/dev-cache.c:723           Found dev 8:17 /dev/sdb1 - new.
#device/dev-cache.c:763           Found dev 8:17 /dev/disk/by-path/pci-0000:03:00.0-scsi-0:0:1:0-part1 - new alias.
#device/dev-cache.c:723           Found dev 8:32 /dev/sdc - new.
#device/dev-cache.c:763           Found dev 8:32 /dev/disk/by-path/pci-0000:03:00.0-scsi-0:0:2:0 - new alias.
#device/dev-cache.c:723           Found dev 8:33 /dev/sdc1 - new.
#device/dev-cache.c:763           Found dev 8:33 /dev/disk/by-path/pci-0000:03:00.0-scsi-0:0:2:0-part1 - new alias.
#device/dev-cache.c:763           Found dev 8:33 /dev/disk/by-uuid/0a81d8a5-6edd-40fb-ae16-14684f045ef7 - new alias.
#device/dev-cache.c:723           Found dev 8:34 /dev/sdc2 - new.
#device/dev-cache.c:763           Found dev 8:34 /dev/disk/by-path/pci-0000:03:00.0-scsi-0:0:2:0-part2 - new alias.
#device/dev-cache.c:763           Found dev 8:34 /dev/disk/by-uuid/52eb5eff-aa0c-435e-809c-5fbda45c6403 - new alias.
#device/dev-cache.c:723           Found dev 8:35 /dev/sdc3 - new.
#device/dev-cache.c:763           Found dev 8:35 /dev/disk/by-path/pci-0000:03:00.0-scsi-0:0:2:0-part3 - new alias.
#device/dev-cache.c:763           Found dev 8:35 /dev/disk/by-uuid/0dba35bd-de0b-4e59-b579-f9d3b18024d4 - new alias.
#device/dev-cache.c:723           Found dev 2:0 /dev/fd0 - new.
#filters/filter-type.c:27            /dev/fd0: Skipping: Unrecognised LVM device type 2
#device/dev-io.c:609           Opened /dev/sda RO O_DIRECT
#device/dev-io.c:359         /dev/sda: size is 1048576000 sectors
#device/dev-io.c:658           Closed /dev/sda
#filters/filter-partitioned.c:30            filter partitioned deferred /dev/sda
#filters/filter-md.c:99            filter md deferred /dev/sda
#filters/filter-persistent.c:346           filter caching good /dev/sda
#filters/filter-type.c:27            /dev/cdrom: Skipping: Unrecognised LVM device type 11
#device/dev-io.c:609           Opened /dev/sda1 RO O_DIRECT
#device/dev-io.c:359         /dev/sda1: size is 1024000 sectors
#device/dev-io.c:658           Closed /dev/sda1
#filters/filter-mpath.c:196           /dev/sda1: Device is a partition, using primary device sda for mpath component detection
#filters/filter-partitioned.c:30            filter partitioned deferred /dev/sda1
#filters/filter-md.c:99            filter md deferred /dev/sda1
#filters/filter-persistent.c:346           filter caching good /dev/sda1
#device/dev-io.c:609           Opened /dev/sda2 RO O_DIRECT
#device/dev-io.c:359         /dev/sda2: size is 1047549952 sectors
#device/dev-io.c:658           Closed /dev/sda2
#filters/filter-mpath.c:196           /dev/sda2: Device is a partition, using primary device sda for mpath component detection
#filters/filter-partitioned.c:30            filter partitioned deferred /dev/sda2
#filters/filter-md.c:99            filter md deferred /dev/sda2
#filters/filter-persistent.c:346           filter caching good /dev/sda2
#device/dev-io.c:609           Opened /dev/sdb RO O_DIRECT
#device/dev-io.c:359         /dev/sdb: size is 4294967296 sectors
#device/dev-io.c:658           Closed /dev/sdb
#filters/filter-partitioned.c:30            filter partitioned deferred /dev/sdb
#filters/filter-md.c:99            filter md deferred /dev/sdb
#filters/filter-persistent.c:346           filter caching good /dev/sdb
#device/dev-io.c:609           Opened /dev/sdb1 RO O_DIRECT
#device/dev-io.c:359         /dev/sdb1: size is 4294965247 sectors
#device/dev-io.c:658           Closed /dev/sdb1
#filters/filter-mpath.c:196           /dev/sdb1: Device is a partition, using primary device sdb for mpath component detection
#filters/filter-partitioned.c:30            filter partitioned deferred /dev/sdb1
#filters/filter-md.c:99            filter md deferred /dev/sdb1
#filters/filter-persistent.c:346           filter caching good /dev/sdb1
#device/dev-io.c:609           Opened /dev/sdc RO O_DIRECT
#device/dev-io.c:359         /dev/sdc: size is 20971520 sectors
#device/dev-io.c:658           Closed /dev/sdc
#filters/filter-partitioned.c:30            filter partitioned deferred /dev/sdc
#filters/filter-md.c:99            filter md deferred /dev/sdc
#filters/filter-persistent.c:346           filter caching good /dev/sdc
#device/dev-io.c:609           Opened /dev/sdc1 RO O_DIRECT
#device/dev-io.c:359         /dev/sdc1: size is 2097152 sectors
#device/dev-io.c:658           Closed /dev/sdc1
#filters/filter-mpath.c:196           /dev/sdc1: Device is a partition, using primary device sdc for mpath component detection
#filters/filter-partitioned.c:30            filter partitioned deferred /dev/sdc1
#filters/filter-md.c:99            filter md deferred /dev/sdc1
#filters/filter-persistent.c:346           filter caching good /dev/sdc1
#device/dev-io.c:609           Opened /dev/sdc2 RO O_DIRECT
#device/dev-io.c:359         /dev/sdc2: size is 2097152 sectors
#device/dev-io.c:658           Closed /dev/sdc2
#filters/filter-mpath.c:196           /dev/sdc2: Device is a partition, using primary device sdc for mpath component detection
#filters/filter-partitioned.c:30            filter partitioned deferred /dev/sdc2
#filters/filter-md.c:99            filter md deferred /dev/sdc2
#filters/filter-persistent.c:346           filter caching good /dev/sdc2
#device/dev-io.c:609           Opened /dev/sdc3 RO O_DIRECT
#device/dev-io.c:359         /dev/sdc3: size is 16775168 sectors
#device/dev-io.c:658           Closed /dev/sdc3
#filters/filter-mpath.c:196           /dev/sdc3: Device is a partition, using primary device sdc for mpath component detection
#filters/filter-partitioned.c:30            filter partitioned deferred /dev/sdc3
#filters/filter-md.c:99            filter md deferred /dev/sdc3
#filters/filter-persistent.c:346           filter caching good /dev/sdc3
#label/label.c:869           Found 9 devices to scan
#label/label.c:628           Scanning 9 devices for VG info
#label/label.c:664           Scanning submitted 9 reads
#label/label.c:683           Processing data from device /dev/sda 8:0 fd 4 block 0x56207e2a8870
#label/label.c:407         /dev/sda: No lvm label detected
#label/label.c:412           <backtrace>
#label/label.c:683           Processing data from device /dev/sda1 8:1 fd 6 block 0x56207e2a88c0
#label/label.c:407         /dev/sda1: No lvm label detected
#label/label.c:412           <backtrace>
#label/label.c:683           Processing data from device /dev/sda2 8:2 fd 7 block 0x56207e2a8910
#label/label.c:407         /dev/sda2: No lvm label detected
#label/label.c:412           <backtrace>
#label/label.c:683           Processing data from device /dev/sdb 8:16 fd 8 block 0x56207e2a8960
#label/label.c:407         /dev/sdb: No lvm label detected
#label/label.c:412           <backtrace>
#label/label.c:683           Processing data from device /dev/sdb1 8:17 fd 9 block 0x56207e2a89b0
#label/label.c:407         /dev/sdb1: No lvm label detected
#label/label.c:412           <backtrace>
#label/label.c:683           Processing data from device /dev/sdc 8:32 fd 10 block 0x56207e2a8a00
#label/label.c:407         /dev/sdc: No lvm label detected
#label/label.c:412           <backtrace>
#label/label.c:683           Processing data from device /dev/sdc1 8:33 fd 11 block 0x56207e2a8a50
#label/label.c:407         /dev/sdc1: No lvm label detected
#label/label.c:412           <backtrace>
#label/label.c:683           Processing data from device /dev/sdc2 8:34 fd 12 block 0x56207e2a8aa0
#label/label.c:407         /dev/sdc2: No lvm label detected
#label/label.c:412           <backtrace>
#label/label.c:683           Processing data from device /dev/sdc3 8:35 fd 13 block 0x56207e2a8af0
#label/label.c:407         /dev/sdc3: No lvm label detected
#label/label.c:412           <backtrace>
#label/label.c:763           Scanned devices: read errors 0 process errors 0 failed 0
#cache/lvmetad.c:2374      Scanning all devices to update lvmetad.
#cache/lvmetad.c:558           Sending lvmetad token_update update in progress
#cache/lvmetad.c:2412          Telling lvmetad to clear its cache
#filters/filter-type.c:27            /dev/fd0: Skipping: Unrecognised LVM device type 2
#device/dev-io.c:336         /dev/sda: using cached size 1048576000 sectors
#filters/filter-partitioned.c:37            /dev/sda: Skipping: Partition table signature found
#filters/filter-type.c:27            /dev/cdrom: Skipping: Unrecognised LVM device type 11
#device/dev-io.c:336         /dev/sda1: using cached size 1024000 sectors
#filters/filter-mpath.c:196           /dev/sda1: Device is a partition, using primary device sda for mpath component detection
#device/dev-io.c:336         /dev/sda1: using cached size 1024000 sectors
#cache/lvmetad.c:2247          Scan metadata from dev /dev/sda1
#cache/lvmetad.c:2260      No PV info found on /dev/sda1 for PVID .
#cache/lvmetad.c:1746          Telling lvmetad to forget any PV on /dev/sda1
#cache/lvmetad.c:784         Request to drop PV /dev/sda1 in lvmetad did not find any matching object.
#device/dev-io.c:336         /dev/sda2: using cached size 1047549952 sectors
#filters/filter-mpath.c:196           /dev/sda2: Device is a partition, using primary device sda for mpath component detection
#device/dev-io.c:336         /dev/sda2: using cached size 1047549952 sectors
#cache/lvmetad.c:2247          Scan metadata from dev /dev/sda2
#cache/lvmetad.c:2260      No PV info found on /dev/sda2 for PVID .
#cache/lvmetad.c:1746          Telling lvmetad to forget any PV on /dev/sda2
#cache/lvmetad.c:784         Request to drop PV /dev/sda2 in lvmetad did not find any matching object.
#device/dev-io.c:336         /dev/sdb: using cached size 4294967296 sectors
#filters/filter-partitioned.c:37            /dev/sdb: Skipping: Partition table signature found
#device/dev-io.c:336         /dev/sdb1: using cached size 4294965247 sectors
#filters/filter-mpath.c:196           /dev/sdb1: Device is a partition, using primary device sdb for mpath component detection
#device/dev-io.c:336         /dev/sdb1: using cached size 4294965247 sectors
#cache/lvmetad.c:2247          Scan metadata from dev /dev/sdb1
#cache/lvmetad.c:2260      No PV info found on /dev/sdb1 for PVID .
#cache/lvmetad.c:1746          Telling lvmetad to forget any PV on /dev/sdb1
#cache/lvmetad.c:784         Request to drop PV /dev/sdb1 in lvmetad did not find any matching object.
#device/dev-io.c:336         /dev/sdc: using cached size 20971520 sectors
#filters/filter-partitioned.c:37            /dev/sdc: Skipping: Partition table signature found
#device/dev-io.c:336         /dev/sdc1: using cached size 2097152 sectors
#filters/filter-mpath.c:196           /dev/sdc1: Device is a partition, using primary device sdc for mpath component detection
#device/dev-io.c:336         /dev/sdc1: using cached size 2097152 sectors
#cache/lvmetad.c:2247          Scan metadata from dev /dev/sdc1
#cache/lvmetad.c:2260      No PV info found on /dev/sdc1 for PVID .
#cache/lvmetad.c:1746          Telling lvmetad to forget any PV on /dev/sdc1
#cache/lvmetad.c:784         Request to drop PV /dev/sdc1 in lvmetad did not find any matching object.
#device/dev-io.c:336         /dev/sdc2: using cached size 2097152 sectors
#filters/filter-mpath.c:196           /dev/sdc2: Device is a partition, using primary device sdc for mpath component detection
#device/dev-io.c:336         /dev/sdc2: using cached size 2097152 sectors
#cache/lvmetad.c:2247          Scan metadata from dev /dev/sdc2
#cache/lvmetad.c:2260      No PV info found on /dev/sdc2 for PVID .
#cache/lvmetad.c:1746          Telling lvmetad to forget any PV on /dev/sdc2
#cache/lvmetad.c:784         Request to drop PV /dev/sdc2 in lvmetad did not find any matching object.
#device/dev-io.c:336         /dev/sdc3: using cached size 16775168 sectors
#filters/filter-mpath.c:196           /dev/sdc3: Device is a partition, using primary device sdc for mpath component detection
#device/dev-io.c:336         /dev/sdc3: using cached size 16775168 sectors
#cache/lvmetad.c:2247          Scan metadata from dev /dev/sdc3
#cache/lvmetad.c:2260      No PV info found on /dev/sdc3 for PVID .
#cache/lvmetad.c:1746          Telling lvmetad to forget any PV on /dev/sdc3
#cache/lvmetad.c:784         Request to drop PV /dev/sdc3 in lvmetad did not find any matching object.
#cache/lvmetad.c:558           Sending lvmetad token_update filter:3239235440
#vgscan.c:118     Reading volume groups from cache.
#toollib.c:2246          Processing each VG
#toollib.c:2294        Obtaining the complete list of VGs to process
#cache/lvmetad.c:1447          Asking lvmetad for complete list of known VG ids/names
#toollib.c:2314      No volume groups found.
#misc/lvm-flock.c:70          Unlocking /run/lock/lvm/P_global
#misc/lvm-flock.c:47            _undo_flock /run/lock/lvm/P_global
#cache/lvmcache.c:2539          Dropping VG info
#cache/lvmcache.c:755           lvmcache has no info for vgname "#orphans_lvm1" with VGID #orphans_lvm1.
#cache/lvmcache.c:755           lvmcache has no info for vgname "#orphans_lvm1".
#cache/lvmcache.c:2086          lvmcache: Initialised VG #orphans_lvm1.
#cache/lvmcache.c:755           lvmcache has no info for vgname "#orphans_pool" with VGID #orphans_pool.
#cache/lvmcache.c:755           lvmcache has no info for vgname "#orphans_pool".
#cache/lvmcache.c:2086          lvmcache: Initialised VG #orphans_pool.
#cache/lvmcache.c:755           lvmcache has no info for vgname "#orphans_lvm2" with VGID #orphans_lvm2.
#cache/lvmcache.c:755           lvmcache has no info for vgname "#orphans_lvm2".
#cache/lvmcache.c:2086          lvmcache: Initialised VG #orphans_lvm2.
#lvmcmdline.c:3050          Completed: vgscan -vvvv