mjhjmtu

I had to reinstall CentOS on a system with a separate disk array for data. I installed on the OS disks and kept the other disk array as storage (so they were not formatted).

When I try to mount the disks, I'm blocked due to unknown filesystem lvm2.

First some background. The system has two arrays of drives. One is for the OS (CentOS 6), the other for Data. Here is the physical disk count on the machine:

# Description Total Gigs
2 HARD DRIVE, 300GB, SAS6, 10, 2.5, H-CE, E/C 600
6 HARD DRIVE, 600G, SAS6, 10, 2.5, W-SIR, E/C 3600

The two smaller drives are mirrored as 300g - this is where the OS lives.

The volume names are not listed when using pvs

PV VG Fmt Att PSize PFree
/dev/sda5 vg_mybox lvm2 a-- 276g 0
/dev/sdb1 lvm2 --- 1.8t 1.8t
/dev/sdc1 lvm2 --- 948g 948.67g

The PSize and PFree lines worry me.

Here's output from pvscan

 PV /dev/sda5 VG vg_ursula lvm2 [276.34 GiB / 0 free]
 PV /dev/sdb1 lvm2 [1.80 TiB]
 PV /dev/sdc1 lvm2 [948.67 GiB]
 Total: 3 [3.00 TiB] / in use: 1 [276.34 GiB] / in no VG: 2 [2.73 TiB]

and lvscan

 ACTIVE '/dev/vg_mybox/LogVol05' [29.30 GiB] inherit
 ACTIVE '/dev/vg_mybox/LogVol04' [48.83 GiB] inherit
 ACTIVE '/dev/vg_mybox/LogVol03' [48.83 GiB] inherit
 ACTIVE '/dev/vg_mybox/lv_root' [111.74 GiB] inherit
 ACTIVE '/dev/vg_mybox/lv_home' [9.77 GiB] inherit
 ACTIVE '/dev/vg_mybox/lv_swap' [27.89 GiB] inherit

and vgscan

 Reading all physical volumes. This may take a while...
 Found volume group "vg_ursula" using metadata type lvm2

and vcgk -vvv

https://gist.github.com/anonymous/25ddd3280a34364fa186

file -s /dev/sdb1

/dev/sdb1: LVM2 (Linux Logical Volume Manager) , UUID: B1bLeFveeDcnfZ2i0tuqWtHgSd6UAgM

file -s /dev/sdc1

/dev/sdc1: LVM2 (Linux Logical Volume Manager) , UUID: SMMVLUKEuBPHuTeoarMkDAlJDDY1Gm2

and

pvdisplay /dev/sdb1

 "/dev/sdb1" is a new physical volume of "1.80 TiB"
 --- NEW Physical volume ---
 PV Name /dev/sdb1
 VG Name 
 PV Size 1.80 TiB
 Allocatable NO
 PE Size 0 
 Total PE 0
 Free PE 0
 Allocated PE 0
 PV UUID B1bLeF-veeD-cnfZ-2i0t-uqWt-HgSd-6UAgMA

pvdisplay /dev/sdc1

 "/dev/sdc1" is a new physical volume of "948.67 GiB"
 --- NEW Physical volume ---
 PV Name /dev/sdc1
 VG Name 
 PV Size 948.67 GiB
 Allocatable NO
 PE Size 0 
 Total PE 0
 Free PE 0
 Allocated PE 0
 PV UUID SMMVLU-KEuB-PHuT-eoar-MkDA-lJDD-Y1Gm2g

When installing this OS, I only moved the 276g drive to the "Install" list and left the other two as storage only. When I reviewed the format/partition settigns, the two storage drives did not have a check under the Format column.

What are my next steps to mount and get the data?

It is strange that your PVs are not assigned to any VG and all the parameters are zero. Looks like formatted.

1.) Boot SystemRescue CD and test if it can detect the LVs on the disk.
So you can backup the data.
Run

pvscan
vgchange -ay

If it not works lets see what pvck can tell you:

pvck -d -v /dev/sdb1
pvck -d -v /dev/sdc1

2.) Without knowing where the LV partitions are the FS cannot be mounted.
Without FS it's hard to access the files.
As last resort you could use file carving tools to save as much data as possible: See scalpel and foremost.