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
There are no attachments for this article.
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
How to recover error - Audit error: dispatch err (pipe full) event lost
Viewed 24610 times since Tue, Aug 6, 2019
bash mistakes This page is a compilation of common mistakes made by bash users. Each example is flawed in some way.
Viewed 8810 times since Sun, Dec 6, 2020
Używanie rsync poprzez Secure Shell
Viewed 40604 times since Thu, May 24, 2018
RHEL7: How to get started with Firewalld.
Viewed 11788 times since Wed, May 22, 2019
Linux Network (TCP) Performance Tuning with Sysctl
Viewed 11008 times since Fri, Aug 3, 2018
How to Synchronize Directories Using Lsyncd in Linux
Viewed 13209 times since Wed, Oct 31, 2018
ZFS: Verify/change properties of a zfs filesystem
Viewed 2322 times since Sun, Jun 3, 2018
How to mount software RAID1 member using mdadm
Viewed 2835 times since Wed, Oct 3, 2018
Tip: SSD and Linux. Enable TRIM and check if it works
Viewed 7247 times since Fri, May 15, 2020
Red Hat Cluster Tutorial
Viewed 1862 times since Sun, Jun 3, 2018