Failing to boot after moving /boot folder to /

zillur · 08-09-2016, 11:11 AM

Thank you very much. Can you tell some hints or suggestion. I want to go with the difficult way. I need to learn this things. Moreover, I had important things which needs to be retrieved. I appreciate help.

Best Regards
Zillur

michaelk · 08-09-2016, 02:42 PM

Check out photorec and testdisk. You never confirmed if the partition photo you posted is the same disk as sda.

zillur · 08-09-2016, 02:49 PM

Thank you very much. How can I confirm this? How can I test disk? Can I create a folder and then mount sda3 in that folder?

Code:

mkdir /works

Code:

mount /dev/sda3 /works

Will it work? Can I retrieve my data by doing this.
I appreciate your kind help.

Best Regards
Zillur

michaelk · 08-09-2016, 03:24 PM

This is what I was referring to:
http://www.cgsecurity.org/

Your previous system /home was /sda1. Currently sda1 is an efi partition and sda3 is a LVM partition which appears to be empty. sda3 can not be mounted. If nothing else was written to the drive then the data should be intact but you have to use the above utilities.

zillur · 08-09-2016, 05:57 PM

Thank you very much. I have downloaded testdisk and followed the step by step instructions. http://www.cgsecurity.org/wiki/TestDisk_Step_By_Step

But still I am in the dark. May be I am missing something. It is supposed that after reboot, everything should be fine. But.....

After reboot:

Code:

[root@bioworkstation testdisk-7.0]# lvs
  LV   VG     Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  home centos -wi-ao---- 57.24g                                                    
  root centos -wi-ao---- 50.00g                                                    
  swap centos -wi-ao----  4.00g                                                    
[root@bioworkstation testdisk-7.0]# pvs
  PV         VG     Fmt  Attr PSize   PFree 
  /dev/sda2         lvm2 ---   14.55t 14.55t
  /dev/sdb2  centos lvm2 a--  111.30g 60.00m
[root@bioworkstation testdisk-7.0]# mount /dev/sda2 /mordor/
mount: unknown filesystem type 'LVM2_member'

Thanks again for your kind help.

Best Regards
Zillur

michaelk · 08-09-2016, 06:27 PM

If my above post is correct your looking for a lost partition which should be ext4. If testdisk fails then the next step would be photorec to search for individual files.

You can not mount a LVM partition. It is just a container for volume groups and logical volumes. You mount the logical volume but sda2 is empty.

zillur · 08-09-2016, 08:09 PM

Thank you very much. I might be wrong, but the disk exists!! So, how can I use it? Any clue? Photorec needs a destination folder to save the recovered files, I think I had more than 10TB datas in that disk. In my current partition, do I have that space?

Code:

PhotoRec 7.0, Data Recovery Utility, April 2015

Please select a destination to save the recovered files.
Do not choose to write the files to the same partition they were stored on.
Keys: Arrow keys to select another directory
      C when the destination is correct
      Q to quit
Directory /home/zillur

Code:

[zillur@bioworkstation ~]$ df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   50G  6.9G   44G  14% /
devtmpfs                  87G     0   87G   0% /dev
tmpfs                     87G  920K   87G   1% /dev/shm
tmpfs                     87G  9.6M   87G   1% /run
tmpfs                     87G     0   87G   0% /sys/fs/cgroup
/dev/mapper/centos-home   58G  163M   58G   1% /home
/dev/sdb1                497M  215M  283M  44% /boot
tmpfs                     18G   16K   18G   1% /run/user/1000
[zillur@bioworkstation ~]$

Thank you again for persistently helping me.
Best Regards
Zillur

michaelk · 08-09-2016, 08:41 PM

Your old home was 28% used which is about 4.5TB. You do not have enough space.

zillur · 08-09-2016, 09:30 PM

Thank you very much. Then what I need to do? How can I use this 16TB disk?

Best Regards
Zillur

jpollard · 08-10-2016, 04:15 AM

save a few files at a time, then move them to some backup storage?

michaelk · 08-10-2016, 04:38 AM

If you write to the disk before the files are recovered they will be overwritten.

zillur · 08-10-2016, 10:42 AM

Thank you very much. But how can I access the disk? I still have some space in that disk. I want to use this disk.
I appreciate your helps.

Best Regards
Zillur

michaelk · 08-10-2016, 10:46 AM

Which disk do you want to use sda or sdb?

zillur · 08-10-2016, 10:50 AM

Thank you very much. I want to use sda.

Best regards
Zillur

michaelk · 08-10-2016, 10:52 AM

Again if sda is the disk you are trying to recover data from then writing to it will destroy any files that might exist.