Does boom support multi-volume snapshots?

Solution In Progress - Updated -


  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Boom


  • Does boom entry support snapshot for multiple logical volumes?
  • Can we take boom snapshots of /var if /var is not under root and then later rollback if needed?

Root Cause

  • Boom has the functionality to take snapshots of single root LV. At this moment, it doesn't have an option to create boom entry for multiple logical volumes.
  • When /var or /usr is separate or other logical volumes which are required to have snapshot together then one cannot create a single boom entry to boot from that snapshot.
  • Boom works only when all the file systems are under root.
  • Multi-volume snapshots are a boom feature that will be available in the future when the work for snapshot-manager will be merged into Red Hat Enterprise Linux but there is no known ETA at this point in time. BZ#1794460 is already in the open state for multi-volume snapshots.

Diagnostic Steps

  • Logical volumes can be verified using #lsblk or #lvs command:
[root@vm254-46 ~]# lsblk
sda             8:0    0    8G  0 disk 
├─sda1          8:1    0    1G  0 part /boot
└─sda2          8:2    0    7G  0 part 
  ├─rhel-root 253:0    0  6.2G  0 lvm  /
  └─rhel-swap 253:1    0  820M  0 lvm  [SWAP]
sr0            11:0    1 1024M  0 rom  

[root@vm254-46 ~]# lvs
  LV   VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root rhel -wi-ao----  <6.20g                                                    
  swap rhel -wi-ao---- 820.00m                                                    
[root@vm254-46 ~]# 

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