EDIT: the system boots off a 16 gigabyte USB key.
Apparently, at some point, the 'device name' (sorry if I'm using that term incorrectly) of the boot device changed.from /dev/sde to /dev/sdb to /dev/sdc
The oldest .vg files (from before I added the new 4 terabyte drive) in /etc/lvm/archives show that the LV is made up of /dev/sda /dev/sdb /dev/sdc /dev/sdd
a slightly-less-old .vg (after adding the new 4 terabyte drive) file shows /dev/sda /dev/sdb /dev/sdc /dev/sdd /dev/sdf
from which I infer that at one point the boot USB Key had device name /dev/sde
When I examine the 'pointers' to the devices in /dev/disk/by-id, I see that what is obviously the boot USB key is now /dev/sdc
here's the contents of /dev/disk/by-id
ata-ST2000DL003-9VT166_5YD6LVYG -> ../../sdb
ata-ST2000DM001-1ER164_Z4Z0MPSR -> ../../sde
ata-ST2000DM006-2DM164_Z5609YHK -> ../../sdd
ata-ST4000DM000-2AE166_WDH0ZQSE -> ../../sdf
ata-WDC_WD40EFRX-68N32N0_WD-WCC7K3NKYTA1 -> ../../sda
lvm-pv-uuid-2d5MB9-J6xH-B80B-lVoQ-Nde9-9CQ1-jxIusp -> ../../sdf
lvm-pv-uuid-hYlB6v-Vkrn-hUNa-JVRK-zbOf-9Lca-Ps1JDL -> ../../sde
lvm-pv-uuid-Nl0vqx-Dggu-4d2I-h5MB-NuoV-CIoM-9Lk7Ye -> ../../sdb
lvm-pv-uuid-VDTFqS-vjAB-kBdf-LI5i-310v-Hs2c-KX9jYs -> ../../sdd
lvm-pv-uuid-YKOqsg-Wkx7-f0f3-ko2J-UeX3-YgFO-6ow0QL -> ../../sda
usb-Generic-_SD_MMC_20090815198100000-0:0 -> ../../sdc
usb-Generic-_SD_MMC_20090815198100000-0:0-part1 -> ../../sdc1
usb-Generic-_SD_MMC_20090815198100000-0:0-part2 -> ../../sdc2
usb-Generic-_SD_MMC_20090815198100000-0:0-part5 -> ../../sdc5
Without knowing or caring at this point how this happened, I would like to know if the UUIDS somehow 'baked in' to the physical drives or in the logical volumes? Do I have to worry that what's listed in /dev/disk/by-id is somehow 'not the same as on the disks'? Can I be confident that what is 'assigned' is correct, or is it just that whatever the system shows here is what is assigned? If the drives just exist, and this mapping is how the UUIDs are assigned etc., if I properly craft the .vg file can I get everything working again?
---original text follows---
I set up an Open Media Vault server with 4 physical discs, a single physical volume and single volume group, and a single logical volume, all called "Fantasia". This isn't RAID and isn't encrypted.
I tried adding an external 4-drive enclosure via eSATA, and discovered the hard way that the eSATA on the motherboard doesn't support port replication.
At any rate, the current state of things is: - pvscan returns promising results - vgscan returns promising results - lvscan returns no output: just a command prompt no message of any kind.
vgscan returns "Found volume group Fantasia" using metadata type lvm2"
when I attempt to vgchange -a y on the "Fantasia" logical volume, it returns
"0 logical volume(s) in volume group "Fantasia" now active"
I'm pretty sure I want that number to be greater than zero.
At risk of making this post unreadable and useless, I haven't posted the output of various commands... if anyone could help me out here, I'm confident that the data is still on the disks: they weren't formatted just disconnected and when reconnected, aren't recognized. I've spent a lot of hours googling etc. and while I do find some useful information i.e. commands to get status etc., I'm wary of executing certain commands that I'm not certain will leave the data on the disk recoverable.
I'm hopeful that all that's wrong is some config file got wiped out, but the data is still in tact, and would sure appreciate it if someone could guide me through the steps from scratch... I think the kind of process that might work would be as though I was moving physical drives from one system to another and wanted all the disks, physical volumes, volume group, and logical volumes to be accessed on that new system.
It's not videos of baby's first steps or anything irreplaceable, but better to recover it go through the effort to replace it, if it can be recovered... so any help would be greatly appreciated.
edit: here is the output of pvscan, pvs, vgscan, and vgs. lvscan and lvs have no output.
# pvscan
PV /dev/sda VG Fantasia lvm2 [1.82 TiB / 1.82 TiB free]
PV /dev/sdc VG Fantasia lvm2 [1.82 TiB / 1.82 TiB free]
PV /dev/sdd VG Fantasia lvm2 [1.82 TiB / 1.82 TiB free]
PV /dev/sde VG Fantasia lvm2 [3.64 TiB / 3.64 TiB free]
PV /dev/sdf VG Fantasia lvm2 [3.64 TiB / 3.64 TiB free]
Total: 5 [12.74 TiB] / in use: 5 [12.74 TiB] / in no VG: 0 [0 ]
# pvs
PV VG Fmt Attr PSize PFree
/dev/sda Fantasia lvm2 a-- 1.82t 1.82t
/dev/sdc Fantasia lvm2 a-- 1.82t 1.82t
/dev/sdd Fantasia lvm2 a-- 1.82t 1.82t
/dev/sde Fantasia lvm2 a-- 3.64t 3.64t
/dev/sdf Fantasia lvm2 a-- 3.64t 3.64t
# vgscan
Reading volume groups from cache.
Found volume group "Fantasia" using metadata type lvm2
# vgs
VG #PV #LV #SN Attr VSize VFree
Fantasia 5 0 0 wz--n- 12.74t 12.74t
here's what testdisk shows:
Select a media (use Arrow keys, then press Enter):
>Disk /dev/sda - 2000 GB / 1863 GiB - ST2000DL003-9VT166
Disk /dev/sdb - 15 GB / 14 GiB - Generic- SD/MMC
Disk /dev/sdc - 2000 GB / 1863 GiB - ST2000DM006-2DM164
Disk /dev/sdd - 2000 GB / 1863 GiB - ST2000DM001-1ER164
Disk /dev/sde - 4000 GB / 3726 GiB - ST4000DM000-2AE166
Disk /dev/sdf - 4000 GB / 3726 GiB - WDC WD40EFRX-68N32N0
"Analyze" on one disk (all disks return similar result)
Disk /dev/sda - 2000 GB / 1863 GiB - ST2000DL003-9VT166
Please select the partition table type, press Enter when done.
[Intel ] Intel/PC partition
[EFI GPT] EFI GPT partition map (Mac i386, some x86_64...)
[Humax ] Humax partition table
[Mac ] Apple partition map
>[None ] Non partitioned media
[Sun ] Sun Solaris partition
[XBox ] XBox partition
[Return ] Return to disk selection
Disk /dev/sda - 2000 GB / 1863 GiB - CHS 243201 255 63
Partition Start End Size in sectors
>P Linux LVM2 0 0 1 243201 80 63 3907029168
Structure: OK
Doing a "Deeper search" takes quite a while but returns these results immediately:
Disk /dev/sda - 2000 GB / 1863 GiB - CHS 243201 255 63
Analyse cylinder 280/243200: 00%
Linux LVM2 0 0 1 243201 80 63 3907029168
ext2 0 38 13 4 58 28 65536
ext2 0 38 13 4 58 28 65536
ext2 0 38 15 4 58 30 65536
ext2 32 7 16 36 27 31 65536
contents of the /dev/mapper/ directory:
/dev/mapper# ls -la
total 0
drwxr-xr-x 2 root root 60 Jun 3 01:44 .
drwxr-xr-x 18 root root 3420 Jun 3 01:46 ..
crw------- 1 root root 10, 236 Jun 3 09:01 control
pvdisplay -m output:
# pvdisplay -m
--- Physical volume ---
PV Name /dev/sdb
VG Name Fantasia
PV Size 1.82 TiB / not usable 936.00 KiB
Allocatable yes
PE Size 4.00 MiB
Total PE 476932
Free PE 476932
Allocated PE 0
PV UUID Nl0vqx-Dggu-4d2I-h5MB-NuoV-CIoM-9Lk7Ye
--- Physical Segments ---
Physical extent 0 to 476931:
FREE
--- Physical volume ---
PV Name /dev/sdd
VG Name Fantasia
PV Size 1.82 TiB / not usable 1.09 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 476932
Free PE 476932
Allocated PE 0
PV UUID VDTFqS-vjAB-kBdf-LI5i-310v-Hs2c-KX9jYs
--- Physical Segments ---
Physical extent 0 to 476931:
FREE
--- Physical volume ---
PV Name /dev/sde
VG Name Fantasia
PV Size 1.82 TiB / not usable 1.09 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 476932
Free PE 476932
Allocated PE 0
PV UUID hYlB6v-Vkrn-hUNa-JVRK-zbOf-9Lca-Ps1JDL
--- Physical Segments ---
Physical extent 0 to 476931:
FREE
--- Physical volume ---
PV Name /dev/sdf
VG Name Fantasia
PV Size 3.64 TiB / not usable 3.84 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 953861
Free PE 953861
Allocated PE 0
PV UUID 2d5MB9-J6xH-B80B-lVoQ-Nde9-9CQ1-jxIusp
--- Physical Segments ---
Physical extent 0 to 953860:
FREE
--- Physical volume ---
PV Name /dev/sda
VG Name Fantasia
PV Size 3.64 TiB / not usable 2.84 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 953861
Free PE 953861
Allocated PE 0
PV UUID YKOqsg-Wkx7-f0f3-ko2J-UeX3-YgFO-6ow0QL
--- Physical Segments ---
Physical extent 0 to 953860:
FREE
output of what I believe to be the last known good lvm file, from /etc/lvm/archive:
# Generated by LVM2 version 2.02.168(2) (2016-11-30): Sat May 4 17:08:11 2019
contents = "Text Format Volume Group"
version = 1
description = "Created *before* executing 'vgextend Fantasia /dev/sdf'"
creation_host = "fantasia" # Linux fantasia 4.19.0-0.bpo.4-amd64 #1 SMP Debian 4.19.28-2~bpo9+1 (2019-03-27) x86_64
creation_time = 1557004091 # Sat May 4 17:08:11 2019
Fantasia {
id = "TPmx5a-MY9Y-gtTS-RwTU-wNFG-EXwU-4PhQDt"
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 = "Nl0vqx-Dggu-4d2I-h5MB-NuoV-CIoM-9Lk7Ye"
device = "/dev/sda" # Hint only
status = ["ALLOCATABLE"]
flags = []
dev_size = 3907027120 # 1.81935 Terabytes
pe_start = 2048
pe_count = 476932 # 1.81935 Terabytes
}
pv1 {
id = "VDTFqS-vjAB-kBdf-LI5i-310v-Hs2c-KX9jYs"
device = "/dev/sdb" # Hint only
status = ["ALLOCATABLE"]
flags = []
dev_size = 3907027120 # 1.81935 Terabytes
pe_start = 2048
pe_count = 476932 # 1.81935 Terabytes
}
pv2 {
id = "hYlB6v-Vkrn-hUNa-JVRK-zbOf-9Lca-Ps1JDL"
device = "/dev/sdc" # Hint only
status = ["ALLOCATABLE"]
flags = []
dev_size = 3907029168 # 1.81935 Terabytes
pe_start = 2048
pe_count = 476932 # 1.81935 Terabytes
}
pv3 {
id = "2d5MB9-J6xH-B80B-lVoQ-Nde9-9CQ1-jxIusp"
device = "/dev/sde" # Hint only
status = ["ALLOCATABLE"]
flags = []
dev_size = 7814037168 # 3.63869 Terabytes
pe_start = 2048
pe_count = 953861 # 3.63869 Terabytes
}
pv4 {
id = "YKOqsg-Wkx7-f0f3-ko2J-UeX3-YgFO-6ow0QL"
device = "[unknown]" # Hint only
status = ["ALLOCATABLE"]
flags = ["MISSING"]
dev_size = 7814037168 # 3.63869 Terabytes
pe_start = 2048
pe_count = 953861 # 3.63869 Terabytes
}
}
logical_volumes {
Fantasia {
id = "lhBS6X-W01J-0iyK-cDpN-Unl9-ALtS-dTMm1t"
status = ["READ", "WRITE", "VISIBLE"]
flags = []
creation_time = 1490757300 # 2017-03-28 23:15:00 -0400
creation_host = "Fantasia"
segment_count = 5
segment1 {
start_extent = 0
extent_count = 953861 # 3.63869 Terabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv3", 0
]
}
segment2 {
start_extent = 953861
extent_count = 476932 # 1.81935 Terabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv0", 0
]
}
segment3 {
start_extent = 1430793
extent_count = 476932 # 1.81935 Terabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv1", 0
]
}
segment4 {
start_extent = 1907725
extent_count = 476932 # 1.81935 Terabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv2", 0
]
}
segment5 {
start_extent = 2384657
extent_count = 953861 # 3.63869 Terabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv4", 0
]
}
}
}
}
