[linux-lvm] Recover LVM Volume Group when 2 physical disks removed
Traiano Welcome
traiano at gmail.com
Tue Oct 31 13:00:57 UTC 2017
Hi list
I'm trying to recover an LVM volume group that has had 2 of it's PVs
removed (these to PVs are beyond recovery).
The original volume group had 6 physical disks, only 4 remain now.
The missing PVs are the P0 and P1 in the set :-(
Is it possible to either:
a) Re-constitute the entire volume group without the missing PVs or
b) Recover the files on the PVs using some other method (I've tried
photorec, but that does not restore the file names)
Here is the current status of the VG (I've also appended the
original backup of the VG metadata at the end of this mail):
1) the VG is listed:
---
root at gamma2:/etc/lvm/backup# vgscan| egrep back
Found volume group "backupvg" using metadata type lvm2
---
2)
---
root at gamma2:/etc/lvm/backup# vgdisplay backupvg
--- Volume group ---
VG Name backupvg
System ID
Format lvm2
Metadata Areas 4
Metadata Sequence No 12
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 4
Act PV 4
VG Size 21.83 TiB
PE Size 4.00 MiB
Total PE 5723164
Alloc PE / Size 0 / 0
Free PE / Size 5723164 / 21.83 TiB
VG UUID OijmJo-thN5-wdHI-iHO6-WURZ-S4i0-GNPBOm
----
3) However it doesn't show up in /dev/mapper:
root at gamma2:/etc/lvm/backup# ls -l /dev/mapper/
total 0
crw------- 1 root root 10, 236 Oct 31 01:57 control
lrwxrwxrwx 1 root root 7 Oct 31 18:58 gamma2--vg-root -> ../dm-0
lrwxrwxrwx 1 root root 7 Oct 31 18:58 gamma2--vg-swap_1 -> ../dm-1
lrwxrwxrwx 1 root root 7 Oct 31 18:58 vg--data-lv--data -> ../dm-2
4) If I try to activate the VG it shows now Logical volumes present:
root at gamma2:/etc/lvm/backup# vgchange -a y backupvg
0 logical volume(s) in volume group "backupvg" now active
5) The (remaining) physical volumes are visible;
root at gamma2:/etc/lvm/backup# pvs
PV VG Fmt Attr PSize PFree
/dev/sda1 backupvg lvm2 a-- 5.46t 5.46t
/dev/sdb1 backupvg lvm2 a-- 5.46t 5.46t
/dev/sdc1 backupvg lvm2 a-- 5.46t 5.46t
/dev/sdd1 backupvg lvm2 a-- 5.46t 5.46t
root at gamma2:/etc/lvm/backup# lvs
LV VG Attr LSize Pool Origin Data% Meta%
Move Log Cpy%Sync Convert
6) Here is the last known good backup of the VG configuration:
# Generated by LVM2 version 2.02.133(2) (2015-10-30): Tue Oct 31 17:08:06 2017
contents = "Text Format Volume Group"
version = 1
description = "Created *before* executing 'vgs'"
creation_host = "gamma2" # Linux gamma2 4.4.0-87-generic
#110-Ubuntu SMP Tue Jul 18 12:55:35 UTC 2017 x86_64
creation_time = 1509440886 # Tue Oct 31 17:08:06 2017
backupvg {
id = "OijmJo-thN5-wdHI-iHO6-WURZ-S4i0-GNPBOm"
seqno = 5
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 = "MNTGzD-L2MT-2I7q-ZFdo-55I7-QniW-tXRS8U"
device = "unknown device" # Hint only
status = ["ALLOCATABLE"]
flags = ["MISSING"]
dev_size = 11721041920 # 5.45804 Terabytes
pe_start = 2048
pe_count = 1430791 # 5.45803 Terabytes
}
pv1 {
id = "Ls67Tj-Ad0f-awoS-NoOH-u3f9-hNC7-9veW9W"
device = "unknown device" # Hint only
status = ["ALLOCATABLE"]
flags = ["MISSING"]
dev_size = 11721041920 # 5.45804 Terabytes
pe_start = 2048
pe_count = 1430791 # 5.45803 Terabytes
}
pv2 {
id = "v1eYUS-BOdV-vBAe-CFw4-yFoj-zA1P-a9lld1"
device = "/dev/sda1" # Hint only
status = ["ALLOCATABLE"]
flags = []
dev_size = 11721041920 # 5.45804 Terabytes
pe_start = 2048
pe_count = 1430791 # 5.45803 Terabytes
}
pv3 {
id = "BxRsPt-VRa1-xW9p-Uobn-COnn-l3A2-qYZA6u"
device = "/dev/sdb1" # Hint only
status = ["ALLOCATABLE"]
flags = []
dev_size = 11721041920 # 5.45804 Terabytes
pe_start = 2048
pe_count = 1430791 # 5.45803 Terabytes
}
pv4 {
id = "9EGrfy-jgUX-cx78-Ocew-drV2-i8V6-iGbL5d"
device = "/dev/sdc1" # Hint only
status = ["ALLOCATABLE"]
flags = []
dev_size = 11721041920 # 5.45804 Terabytes
pe_start = 2048
pe_count = 1430791 # 5.45803 Terabytes
}
pv5 {
id = "SGU0dD-Aqch-zV5E-6lt5-NcfV-AUvo-A3mIbv"
device = "/dev/sdd1" # Hint only
status = ["ALLOCATABLE"]
flags = []
dev_size = 11721041920 # 5.45804 Terabytes
pe_start = 2048
pe_count = 1430791 # 5.45803 Terabytes
}
}
logical_volumes {
backuplv {
id = "6V1b2C-PzGM-lgEy-YaSg-EFu5-iZ6u-wQVR9X"
status = ["READ", "WRITE", "VISIBLE"]
flags = []
creation_host = "gamma-compute2"
creation_time = 1507207639 # 2017-10-05 20:47:19 +0800
segment_count = 6
segment1 {
start_extent = 0
extent_count = 1430791 # 5.45803 Terabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv0", 0
]
}
segment2 {
start_extent = 1430791
extent_count = 1430791 # 5.45803 Terabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv1", 0
]
}
segment3 {
start_extent = 2861582
extent_count = 1430791 # 5.45803 Terabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv2", 0
]
}
segment4 {
start_extent = 4292373
extent_count = 1430791 # 5.45803 Terabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv3", 0
]
}
segment5 {
start_extent = 5723164
extent_count = 1430791 # 5.45803 Terabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv4", 0
]
}
segment6 {
start_extent = 7153955
extent_count = 1430791 # 5.45803 Terabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv5", 0
]
}
}
}
}
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