[linux-lvm] Lost lost logical volume on problematic LVM

[Anton Bizzarri]

Hello, I am trying this list as I wasn't able to get much assistance on
another lace.

We had a LVM made up of 4 disks and lost a drive. I pulled the drive and
replaced it and then tried to repair but then when I tried to recover it,
it turned out it was a striped volume. (Its not my server! Never thought
they would put the data on a striped volume).

So I returned the original drive back into the same slot to see if there
was a way to recover the data.

This is lvm2 2.02.95-8

The drive that failed was /dev/sdc. When I put in back in it magically
started working. I want to see if its possible to try to recover the data
because all the drives are actually still in the exact same slots. The
main issue is it is not finding the logical volume anymore.

Any help appreciated.

AB



Below are my logs.

/# pvscan -v
Wiping cache of LVM-capable devices
Wiping internal VG cache
Walking through all physical volumes
PV /dev/sdb VG data lvm2 [465.76 GiB / 465.76 GiB free]
PV /dev/sdd VG data lvm2 [465.76 GiB / 465.76 GiB free]
PV /dev/sde VG data lvm2 [465.76 GiB / 465.76 GiB free]
PV /dev/sdf VG data lvm2 [465.76 GiB / 465.76 GiB free]
PV /dev/sdc VG data lvm2 [465.76 GiB / 465.76 GiB free]
Total: 5 [2.27 TiB] / in use: 5 [2.27 TiB] / in no VG: 0 [0 ]


:/# vgscan -v
Wiping cache of LVM-capable devices
Wiping internal VG cache
Reading all physical volumes. This may take a while...
Finding all volume groups
Finding volume group "data"
Found volume group "data" using metadata type lvm2


/# lvscan -v
Finding all logical volumes

I have a file in the archive folder /etc/lvm/archive that is from the
morning before I ran "vgreduce --removemissing --force data"

Is there any way to restore the metadata? Below is the contents of archive
file.

# Generated by LVM2 version 2.02.95(2) (2012-03-06): Thu Oct 22 09:44:12
2015

contents = "Text Format Volume Group"
version = 1

description = "Created *before* executing 'vgreduce --removemissing --force
data'"

creation_host = "" # Linux 3.2.0-4-amd64 #1 SMP Debian 3.2.68-1+deb7u5
x86_64
creation_time = 1445521452 # Thu Oct 22 09:44:12 2015

data {
id = "0UcXlh-1lXG-udrp-T6QJ-fqMt-G5mz-mgpLmN"
seqno = 6
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 = "mKQGfL-Fs0C-bRIv-rcKT-jbWs-7olM-R2VCCw"
device = "/dev/sdb" # Hint only

status = ["ALLOCATABLE"]
flags = []
dev_size = 976773168 # 465.762 Gigabytes
pe_start = 384
pe_count = 119234 # 465.758 Gigabytes
}

pv1 {
id = "KLL51K-SwV9-6VU6-9ulL-DOJy-L9uJ-T5k43a"
device = "unknown device" # Hint only

status = ["ALLOCATABLE"]
flags = ["MISSING"]
dev_size = 976773168 # 465.762 Gigabytes
pe_start = 384
pe_count = 119234 # 465.758 Gigabytes
}

pv2 {
id = "98S7nn-R4sG-OMBc-HR9Y-kHPM-Du8q-ZBNJ3c"
device = "/dev/sdd" # Hint only
dev_size = 976773168 # 465.762 Gigabytes
pe_start = 384
pe_count = 119234 # 465.758 Gigabytes
}

pv3 {
id = "d1CHzd-91uQ-7c0X-XA02-0Tlh-bBtv-rusTsj"
device = "/dev/sde" # Hint only

status = ["ALLOCATABLE"]
flags = []
dev_size = 976773168 # 465.762 Gigabytes
pe_start = 384
pe_count = 119234 # 465.758 Gigabytes
}

pv4 {
id = "vK0cGK-zz71-rpGC-IcP3-gsKU-EHjx-fY70SB"
device = "/dev/sdf" # Hint only

status = ["ALLOCATABLE"]
flags = []
dev_size = 976773168 # 465.762 Gigabytes
pe_start = 384
pe_count = 119234 # 465.758 Gigabytes
}
}

logical_volumes {

home {
id = "DM6HzG-mgeC-Hj4M-MyKk-k8UT-ZjHU-t74qTe"
status = ["READ", "WRITE", "VISIBLE"]
flags = []
segment_count = 5

segment1 {
start_extent = 0
extent_count = 119234 # 465.758 Gigabytes

type = "striped"
stripe_count = 1 # linear

stripes = [
"pv0", 0
]
}
segment2 {
start_extent = 119234
extent_count = 119234 # 465.758 Gigabytes
type = "striped"
stripe_count = 1 # linear

stripes = [
"pv1", 0
]
}
segment3 {
start_extent = 238468
extent_count = 119234 # 465.758 Gigabytes

type = "striped"
stripe_count = 1 # linear

stripes = [
"pv2", 0
]
}
segment4 {
start_extent = 357702
extent_count = 119234 # 465.758 Gigabytes

type = "striped"
stripe_count = 1 # linear

stripes = [
"pv3", 0
]
}
segment5 {
start_extent = 476936
extent_count = 118131 # 461.449 Gigabytes

type = "striped"
stripe_count = 1 # linear

stripes = [
"pv4", 0
]
}
}
}
}
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