恢復的 VG 已轉移卷

我正在使用包含多個 LV 的單個 VG 在 mdadm RAID 1 上恢復 PV。

底層設備有幾個壞扇區（一個只有幾個，另一個真的很多），一個愚蠢的錯字使得有必要通過對設備進行 grepping 來恢復 LVM 配置。幸運的是，我找到了它，恢復的配置看起來像原來的配置。

唯一的問題是邏輯卷沒有有效的文件系統。使用 e2sl，我發現我的目標 fs 的超級塊之一位於錯誤的邏輯卷中。可悲的是，我不知道如何糾正或規避這個問題。

root@rescue ~/e2sl # ./ext2-superblock -d /dev/vg0/tmp  | grep 131072000
Found: block 20711426 (cyl 1369, head 192, sector 50), 131072000 blocks, 129988776 free blocks, 4096 block size, (null)
root@rescue ~/e2sl # ./ext2-superblock -d /dev/vg0/home | grep 131072000
Found: block 2048 (cyl 0, head 32, sector 32), 131072000 blocks, 129988776 free blocks, 4096 block size, (null)
Found: block 526336 (cyl 34, head 194, sector 34), 131072000 blocks, 129988776 free blocks, 4096 block size, (null)
Found: block 1050624 (cyl 69, head 116, sector 36), 131072000 blocks, 129988776 free blocks, 4096 block size, (null)
Found: block 1574912 (cyl 104, head 38, sector 38), 131072000 blocks, 129988776 free blocks, 4096 block size, (null)
Found: block 2099200 (cyl 138, head 200, sector 40), 131072000 blocks, 129988776 free blocks, 4096 block size, (null)
Found: block 6293504 (cyl 416, head 56, sector 56), 131072000 blocks, 129988776 free blocks, 4096 block size, (null)
Found: block 6817792 (cyl 450, head 218, sector 58), 131072000 blocks, 129988776 free blocks, 4096 block size, (null)
Found: block 12584960 (cyl 832, head 81, sector 17), 131072000 blocks, 129988776 free blocks, 4096 block size, (null)
Found: block 20973568 (cyl 1387, head 33, sector 49), 131072000 blocks, 129988776 free blocks, 4096 block size, (null)
Found: block 32507904 (cyl 2149, head 238, sector 30), 131072000 blocks, 129988776 free blocks, 4096 block size, (null)
Found: block 63440896 (cyl 4195, head 198, sector 22), 131072000 blocks, 129988776 free blocks, 4096 block size, (null)
Found: block 89655296 (cyl 5929, head 139, sector 59), 131072000 blocks, 129988776 free blocks, 4096 block size, (null)
^C

我感覺距離再次訪問我的文件系統以恢復一些非備份數據只有一英寸的距離。

LVM 配置：

root@rescue ~ # pvs
 PV         VG   Fmt  Attr PSize PFree
 /dev/md1   vg0  lvm2 a--  2.71t 767.52g

root@rescue ~ # vgs
 VG   #PV #LV #SN Attr   VSize VFree
 vg0    1   5   0 wz--n- 2.71t 767.52g

root@rescue ~ # lvs
 LV        VG   Attr     LSize   Pool Origin Data%  Move Log Copy%  Convert
 backup    vg0  -wi-a--- 500.00g
 container vg0  -wi-a--- 500.00g
 home      vg0  -wi-a--- 500.00g
 root      vg0  -wi-a--- 500.00g
 tmp       vg0  -wi-a---  10.00g

VG 配置：

# Generated by LVM2 version 2.02.95(2) (2012-03-06): Sun Oct 13 23:56:33 2013

contents = "Text Format Volume Group"
version = 1

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

creation_host = "rescue"        # Linux rescue 3.10.12 #29 SMP Mon Sep 23 13:18:39 CEST 2013 x86_64
creation_time = 1381701393      # Sun Oct 13 23:56:33 2013

vg0 {
   id = "7p0Aiw-pBpd-rn6Y-geFb-jyZe-gide-Anc9ag"
   seqno = 19
   format = "lvm2" # informational
   status = ["RESIZEABLE", "READ", "WRITE"]
   flags = []
   extent_size = 8192              # 4 Megabytes
   max_lv = 0
   max_pv = 0
   metadata_copies = 0

   physical_volumes {

           pv0 {
                   id = "GBIwI4-AxBa-6faf-aLfB-UZiP-iSS9-FaOrhH"
                   device = "/dev/md1"     # Hint only

                   status = ["ALLOCATABLE"]
                   flags = []
                   dev_size = 5824875134   # 2.71242 Terabytes
                   pe_start = 384
                   pe_count = 711044       # 2.71242 Terabytes
           }
   }

   logical_volumes {

           root {
                   id = "1e3gvq-IJnX-Aimz-ziiY-zucE-soCO-YU2ayp"
                   status = ["READ", "WRITE", "VISIBLE"]
                   flags = []
                   segment_count = 1

                   segment1 {
                           start_extent = 0
                           extent_count = 128000   # 500 Gigabytes

                           type = "striped"
                           stripe_count = 1        # linear

                           stripes = [
                                   "pv0", 0
                           ]
                   }
           }
           tmp {
                   id = "px8JAy-JnkP-Amry-uHtf-lCUB-rfdx-Z8y11y"
                   status = ["READ", "WRITE", "VISIBLE"]
                   flags = []
                   segment_count = 1

                   segment1 {
                           start_extent = 0
                           extent_count = 2560     # 10 Gigabytes

                           type = "striped"
                           stripe_count = 1        # linear

                           stripes = [
                                   "pv0", 128000
                           ]
                   }
           }

           home {
                   id = "e0AZbd-22Ss-RLrF-TgvF-CSDN-Nw6w-Gj7dal"
                   status = ["READ", "WRITE", "VISIBLE"]
                   flags = []
                   segment_count = 1

                   segment1 {
                           start_extent = 0
                           extent_count = 128000   # 500 Gigabytes

                           type = "striped"
                           stripe_count = 1        # linear

                           stripes = [
                                   "pv0", 130560
                           ]
                   }
           }

           backup {
                   id = "ZXNcbK-gYKj-LJfm-f193-Ozsi-Rm3Y-kZL37c"
                   status = ["READ", "WRITE", "VISIBLE"]
                   flags = []
                   creation_host = "new.bountin.net"
                   creation_time = 1341852222      # 2012-07-09 18:43:42 +0200
                   segment_count = 1

                   segment1 {
                           start_extent = 0
                           extent_count = 128000   # 500 Gigabytes

                           type = "striped"
                           stripe_count = 1        # linear

                           stripes = [
                                   "pv0", 258560
                           ]
                   }
           }

        container {
                   id = "X9wheh-3ADB-Fiau-j7SR-pcH9-hXne-K2NVAc"
                   status = ["READ", "WRITE", "VISIBLE"]
                   flags = []
                   creation_host = "new.bountin.net"
                   creation_time = 1341852988      # 2012-07-09 18:56:28 +0200
                   segment_count = 1

                   segment1 {
                           start_extent = 0
                           extent_count = 128000   # 500 Gigabytes

                           type = "striped"
                           stripe_count = 1        # linear

                           stripes = [
                                   "pv0", 386560
                           ]
                   }
           }
   }
}

對於有類似問題的任何人：

我用e2sl

$$ 1 $$直接從其中一個 RAID 設備中實際找到文件系統的候選者，並使用循環設備安裝文件系統$$ 2 $$跳過 LVM 和軟體 RAID。我不得不稍微調整一下偏移量（超級塊位置到分區開頭的偏移量為 1KB！）但最後我設法做到了。 從那裡救援很容易：將 loopdevice 安裝到安裝點，所有內容都可以複製。

$$ 1 $$ http://schumann.cx/e2sl/ $$ 2 $$mount –loop 並查看 losttup

引用自：https://unix.stackexchange.com/questions/96000