How to backup/restore Red Hat Enterprise Linux 7.3 with Veritas System Recovery (VSR) for Linux edition on BIOS system.

How to backup/restore Red Hat Enterprise Linux 7.3 with Veritas System Recovery (VSR) for Linux edition on BIOS system.

  • Article ID:100041317
  • Last Published:
  • Product(s):System Recovery

Problem

This article has been written for Red Hat Enterprise Linux (RHEL) 7.3 on BIOS machine. However, the steps listed can also be used for other supported operating system (OS) versions like 7.0/7.1/7.2 or CentOS 7.x.

The environment is as follows in this scenario:

Environment
 

BIOS mode Legacy (BIOS system) 
OS / Kernel version Red Hat  Enterprise Linux, 3.10.0.-514.el7.x86_64
Veritas System Recovery for Linux version 18.0.0.56417
Hostname rhel73x64.local
Partition information Backup sources: /,  /boot
Backup destination:  /backup
For details See Figure 1

Figure 1
Image

Note:
/dev/sda2 is LVM physical volume (PV).
rhel_rhel73x64 is LVM volume group (VG).
rhel_rhel73x64-root and rhel_rhel73x64-swap are LVM logical volumes (LVs).

 

Solution

Backing up:
1. Recommend to back up the information for your partitions in advance.

# sfdisk -d /dev/sda > /backup/sfdisk_sda.txt
# sfdisk -d /dev/sda > /backup/sfdisk_sda_backup.txt

Note: Veritas recommends creating a backup file (sfdisk_sda_backup.txt).

2. Make a backup of LVM information in advance if including LVM on the system. 


# vgcfgbackup -f /backup/rhel_rhel73x64.txt

Note: Recommend to set the filename as the VG Name that is returned by "vgdisplay" command.
 (See Figure 2)

Figure 2

Image

# blkid -o value -s UUID /dev/sda2 > /backup/uuid_sda2.txt

Note: If needed, back up the other LVM information.


3. Backup volumes with backup commands.

# symsr -b /boot -d /backup
# symsr -b / -d /backup

Note: If needed, back up the other partitions or mount points.

4. If you would like to verify your recovery points, run below commands.

# symsr -vrp /backup/boot_000.v2i
# symsr -vrp /backup/system_000.v2i


Creating System Recovery disk (SRD)

1. To create SRD, run "createSRD" command after mounting Red Hat install media that has the same version as the system.

For instance:
# createSRD -i <Red Hat install media> -d /backup/SRD.iso

Note: Install squashfs-tools if "mksquashfs is required to create this SRD" appears. (See Figure 3)

Figure 3
Image



Restoring:

1. Boot from SRD.

2. Select "Rescue a Red Hat Enterprise Linux system". (See Figure 4)

Figure 4
Image


3. Select "3) Skip to shell". (See Figure 5)

Figure 5
Image

4. Mount a backup destination to /backup.

# mkdir /backup
# mount /dev/sdb1 /backup

Note 1: If you fail to mount Windows share in SRD, refer to article 100041721. CIFS helper program file can be added to SRD manually.

Note 2: If you need to access a network location (in order to get access to the backup destination), configure the network card/ip address using the IFCONFIG command (refer to Red Hat documentation for more details).

5. Restore the patitions of /dev/sda from a backup file. (See Figure 6)

# sfdisk -f /dev/sda < /backup/sfdisk_sda.txt

CAUTION: "<" is a less-than sign. If ">" is used by mistake, /backup/sfdisk_sda.txt is overwritten. Then, run the same command again after copying /backup/sfdisk_sda_backup.txt to /backup/sfdisk_sda.txt.

Figure 6

Image

6. Confirm the partition is reverted using "fdisk -l /dev/sda". (See Figure 7)

Figure 7
Image

7. If LVM was used in the backed up system, set variable uuid using the below commands. (See Figure 8). If LVM was not used, skip Step 7-12 and proceed to Step 13.

# uuid=$(cat /backup/uuid_sda2.txt)
# echo $uuid

Note: Confirm "echo $uuid" returns "xxxxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxxxx". 

Figure 8
Image

8. Restore PV using the below command. (See Figure 9)

# pvcreate -ff --restorefile /backup/rhel_rhel73x64.txt --uuid $uuid /dev/sda2

Figure 9
Image

 

Note:
If above command fails and if you restore a volume or partition that LVM (Linux Volume Manager) or software RAID managed, before you start the recovery process you must use lvmtools or the RAID tools that are present on the recovery disk to set up LVM or software RAID.


9. Confirm the restored PV using the command "pvdisplay". (See Figure 10)

Figure 10
Image

10. Restore LV using the below command. (See Figure 11)

# vgcfgrestore -f /backup/rhel_rhel73x64.txt rhel_rhel73x64

Figure 11
Image

11. Confirm the restored LV using the command "lvdisplay". (See Figure 12)

Figure 12
Image

12. Activate VG using the below command. (See Figure 13)

# vgchange -a y rhel_rhel73x64

Figure 13
Image

13. Restore all recovery points. (See Figure 14)

# symsr -r /backup/boot_000.v2i -d /dev/sda1
# symsr -r /backup/system_000.v2i -d /dev/mapper/rhel_rhel73x64-root

Figure 14

Image

14. Set swap partition using the below commands. (See Figure 15)

# mkswap /dev/mapper/rhel-rhel73x64-swap
# swapon -v /dev/mapper/rhel-rhel73x64-swap
# swapon -s

Figure 15
Image

15. Reboot and remove SRD media.

# reboot

Note: If the screen stays black while booting from the restored system, refer to article 100041257.

Note: If swap partition is not enabled after rebooting, refer to article 100042614.

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