Re: [linux-lvm] broken fs after removing disk from group

[Marc des Garets <marc@ttux.net>]

For example, what about if I take a new disk and I do this (/dev/sdc 
being a new empty disk):

pvcreate --uuid NOskcl-8nOA-PpZg-DCtW-KQgG-doKw-n3J9xd /dev/sdc

NOskcl-8nOA-PpZg-DCtW-KQgG-doKw-n3J9xd is the id of the disk that died 
before. This new disk is 1.8Tb instead of 298Gb though.

Then I restore the lvm metadata I posted in my previous email then 
vgscan and vgchange like this:
vgcfgrestore VolGroup00
vgscan
vgchange -ay VolGroup00

And then I fsck:
e2fsck /dev/VolGroup00/lvolmedia

On 11/13/2014 08:21 AM, Marc des Garets wrote:
> I think something is possible. I still have the config from before it 
> died. Below is how it was. The disk that died (and which I removed) is 
> pv1 (/dev/sdc1) but it doesn't want to restore this config because it 
> says the disk is missing.
>
> VolGroup00 {
>         id = "a0p2ke-sYDF-Sptd-CM2A-fsRQ-jxPI-6sMc9Y"
>         seqno = 4
>         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 = "dRhDoK-p2Dl-ryCc-VLhC-RbUM-TDUG-2AXeWQ"
>                         device = "/dev/sda4"    # Hint only
>
>                         status = ["ALLOCATABLE"]
>                         flags = []
>                         dev_size = 874824678    # 417.149 Gigabytes
>                         pe_start = 2048
>                         pe_count = 106789       # 417.145 Gigabytes
>                 }
>
>                 pv1 {
>                         id = "NOskcl-8nOA-PpZg-DCtW-KQgG-doKw-n3J9xd"
>                         device = "/dev/sdc1"    # Hint only
>
>                         status = ["ALLOCATABLE"]
>                         flags = []
>                         dev_size = 625142385    # 298.091 Gigabytes
>                         pe_start = 2048
>                         pe_count = 76311        # 298.09 Gigabytes
>                 }
>
>                 pv2 {
>                         id = "MF46QJ-YNnm-yKVr-pa3W-WIk0-seSr-fofRav"
>                         device = "/dev/sdb1"    # Hint only
>
>                         status = ["ALLOCATABLE"]
>                         flags = []
>                         dev_size = 3906963393   # 1.81932 Terabytes
>                         pe_start = 2048
>                         pe_count = 476923       # 1.81932 Terabytes
>                 }
>         }
>
>         logical_volumes {
>
>                 lvolmedia {
>                         id = "aidfLk-hjlx-Znrp-I0Pb-JtfS-9Fcy-OqQ3EW"
>                         status = ["READ", "WRITE", "VISIBLE"]
>                         flags = []
>                         creation_host = "archiso"
>                         creation_time = 1402302740      # 2014-06-09 
> 10:32:20 +0200
>                         segment_count = 3
>
>                         segment1 {
>                                 start_extent = 0
>                                 extent_count = 476923   # 1.81932 
> Terabytes
>
>                                 type = "striped"
>                                 stripe_count = 1        # linear
>
>                                 stripes = [
>                                         "pv2", 0
>                                 ]
>                         }
>                         segment2 {
>                                 start_extent = 476923
>                                 extent_count = 106789   # 417.145 
> Gigabytes
>
>                                 type = "striped"
>                                 stripe_count = 1        # linear
>
>                                 stripes = [
>                                         "pv0", 0
>                                 ]
>                         }
>                         segment3 {
>                                 start_extent = 583712
>                                 extent_count = 76311    # 298.09 
> Gigabytes
>
>                                 type = "striped"
>                                 stripe_count = 1        # linear
>
>                                 stripes = [
>                                         "pv1", 0
>                                 ]
>                         }
>                 }
>         }
> }
>
> On 11/13/2014 12:11 AM, Fran Garcia wrote:
>> On Wed, Nov 12, 2014 at 11:16 PM, Marc des Garets wrote:
>>> Hi,
>>> [...]
>>> Now the problem is that I can't mount my volume because it says:
>>> wrong fs type, bad option, bad superblock
>>>
>>> Which makes sense as the size of the partition is supposed to be 
>>> 2.4Tb but
>>> now has only 2.2Tb. Now the question is how do I fix this? Should I 
>>> use a
>>> tool like testdisk or should I be able to somehow create a new physical
>>> volume / volume group where I can add my logical volumes which 
>>> consist of 2
>>> physical disks and somehow get the file system right (file system is 
>>> ext4)?
>> So you basically need a tool that will "invent" about 200 *Gb* of
>> missing filesystem? :-)
>>
>> I think you better start grabbing your tapes for a restore...
>>
>> ~f
>>
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>