LVM: Mount LVM Partition(s) in Rescue Mode

LVM: Mount LVM Partition(s) in Rescue Mode


# When system is not able to boot up due to OS problems we may be leaded to boot it into
# Rescue Mode using a installation CD.

# While booting in this mode, system will try to find out linux installation and mount it
# under /mnt/sysimage giving us the opportunity of getting to F.S. in order to make
# appropriate modifications for system to be recovered. Sometimes, if OS is seriously
# damaged this is not possible. In this case, it may be useful to manually mount LVM
# partitions to check/modify OS to recover server.


# Boot the machine with installation CD into Rescue Mode.

sh-3.2# df -k
   Filesystem                1K-blocks        Used     Available  Use%   Mounted on
   /dev                         517568           0        517568    0%   /dev
   /tmp/loop0                   109184      109184             0  100%   /mnt/runtime

sh-3.2# vgs
   sh: vgs: command not found

sh-3.2# pvscan
   sh:  pvscan: command not found


# We get this kind of errors because lvm commands are not available in Rescue Mode.
# Instead we will precede any lvm commands by "lvm" command this way:

sh-3.2# lvm vgs
   VG    #PV  #LV  #SN  Attr      VSize    VFree
   vg00    1    7    0  wz--n-    31.50G      0


 
# Now we are ready to use lvm commands so we can mount our lvm volumes

# Check existing logical volumes

sh-3.2# lvm lvs
   LV      VG    Attr    LSize  Origin Snap%  Move Log Copy%  Convert
   lvhome  vg00  -wi---  4.50G
   lvopt   vg00  -wi---  5.00G
   lvroot  vg00  -wi---  5.00G
   lvswap  vg00  -wi---  5.00G
   lvtmp   vg00  -wi---  2.00G
   lvusr   vg00  -wi---  5.00G
   lvvar   vg00  -wi---  5.00G


# Activate our root volume group

sh-3.2# lvm vgchange -a y vg00
  7 logical volume(s) in volume group "vg00" now active

# Mount any desired volume, in this case "/" filesystem
 
sh-3.2# mkdir /mnt/temp
sh-3.2# mount /dev/vg00/lvroot /mnt/temp

# Now we are able to access our OS data to make any needed check/modification
5 (1)
Article Rating (1 Votes)
Rate this article
Attachments
There are no attachments for this article.
Comments
There are no comments for this article. Be the first to post a comment.
Full Name
Email Address
Security Code Security Code
Related Articles RSS Feed
RHEL: Crash kernel dumps configuration and analysis on RHEL 7
Viewed 5680 times since Sat, Jun 2, 2018
Open SSL Encrypt & Decrypt Files With Password Using OpenSSL
Viewed 2774 times since Mon, Feb 18, 2019
18 Quick ‘lsof’ command examples for Linux Geeks
Viewed 8497 times since Sun, Jun 30, 2019
RHCS6: Install a two-node basic cluster
Viewed 1416 times since Sun, Jun 3, 2018
Tips to Solve Linux & Unix Systems Hard Disk Problems
Viewed 1288 times since Fri, May 15, 2020
Enabling or disabling a repository using Red Hat Subscription Management
Viewed 2038 times since Mon, Oct 29, 2018
FIO (Flexible I/O) – a benchmark tool for any operating system
Viewed 18032 times since Wed, Jul 25, 2018
stunnel Howto A Guide to create SSL access to a HTTP-only webserver with stunnel
Viewed 1076 times since Fri, Sep 28, 2018
chrt command: Set / Manipulate Real Time Attributes of a Linux Process
Viewed 9317 times since Mon, Feb 17, 2020
Linux Proxy Server Settings – Set Proxy For Command Line
Viewed 1226 times since Mon, Feb 18, 2019