Estou recuperando um PV em um mdadm RAID 1 com um único VG contendo vários LVs.
Os dispositivos subjacentes têm vários setores defeituosos (um apenas alguns, o outro realmente muito) e um erro de digitação bobo tornou necessário restaurar a configuração do LVM percorrendo os dispositivos. Por sorte eu encontrei e a configuração restaurada parece com a original.
O único problema é que os volumes lógicos não possuem um sistema de arquivos válido. Com o e2sl, descobri que um dos superblocks do meu alvo fs está no volume lógico incorreto. Infelizmente, não tenho ideia de como corrigir ou contornar esse problema.
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
Estou me sentindo apenas a um centímetro de acessar meu (s) sistema (s) de arquivos novamente para recuperar alguns dados sem backup.
Configuração da LVM:
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
Configuração VG:
# 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
]
}
}
}
}