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Re: [linux-lvm] Logical Volume Inaccessible



On 11/01/14 11:59 PM, Tom+Dale wrote:

What does 'pvscan; vgscan; lvscan' show? If the LVs show 'inactive', try

'lvchange -ay <lv_path>', then 'lvscan' should show the LV as 'ACTIVE'.
If so, try mounting the LV.
--
Digimer
Papers and Projects: https://alteeve.ca/w/
What if the cure for cancer is trapped in the mind of a person without
access to education?

Here is what I got:

[root localhost ~]# pvscan
   /dev/sda2: read failed after 0 of 1024 at 0: Input/output error
   /dev/sda2: read failed after 0 of 1024 at 4096: Input/output error
   /dev/sda2: read failed after 0 of 2048 at 0: Input/output error
   No matching physical volumes found
[root localhost ~]# lvscan
   /dev/sda2: read failed after 0 of 2048 at 0: Input/output error
[root localhost ~]# vgscan
   Reading all physical volumes.  This may take a while...
   /dev/sda2: read failed after 0 of 1024 at 0: Input/output error
   /dev/sda2: read failed after 0 of 1024 at 4096: Input/output error
   /dev/sda2: read failed after 0 of 2048 at 0: Input/output error
[root localhost ~]# lvchange -ay /dev/sda2
   /dev/sda2: read failed after 0 of 2048 at 0: Input/output error
   /dev/sda2: read failed after 0 of 1024 at 0: Input/output error
   /dev/sda2: read failed after 0 of 1024 at 4096: Input/output error
   /dev/sda2: read failed after 0 of 2048 at 0: Input/output error
   Volume group "sda2" not found
   Skipping volume group sda2
[root localhost ~]#

Eep,

That looks like the drive might be failing. If you don't have a good backup, then you might want to stop. If the data on the drive is very valuable, I would do nothing more and call a data recovery house. If that's not feasible, then the first thing I would do is connect another drive of equal or larger size and dd the bad drive to the other drive.

For example, if the bad drive comes up as /dev/sdb and the spare/backup drive comes up as /dev/sdc, you would want to run something like 'dd if=/dev/sdb of=/dev/sdc bs=8k'. That will clone, byte for byte, sdb onto sdc (and erase whatever was on sdc, of course). Then set aside the failing drive and try to recover the data on sdc (possibly copy it again to a 3rd drive, just to be extra safe). This way, if something goes wrong, you can start over.



--
Digimer
Papers and Projects: https://alteeve.ca/w/
What if the cure for cancer is trapped in the mind of a person without access to education?


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