OLVM

In this section

• 📐 Storage

  General concern

  • If you want to move VMs to an another Storage Domain, you need to copy the template from it as well!

  • Remove a disk:

   1# IF RHV does not use anymore disk those should appear empty in lsblk: 
   2lsblk -a
   3sdf                                                                                     8:80   0     4T  0 disk
   4└─36001405893b456536be4d67a7f6716e3                                                   253:38   0     4T  0 mpath
   5sdg                                                                                     8:96   0     4T  0 disk
   6└─36001405893b456536be4d67a7f6716e3                                                   253:38   0     4T  0 mpath
   7sdh                                                                                     8:112  0     4T  0 disk
   8└─36001405893b456536be4d67a7f6716e3                                                   253:38   0     4T  0 mpath
   9sdi                                                                                     8:128  0         0 disk
  10└─360014052ab23b1cee074fe38059d7c94                                                   253:39   0   100G  0 mpath
  11sdj                                                                                     8:144  0         0 disk
  12└─360014052ab23b1cee074fe38059d7c94                                                   253:39   0   100G  0 mpath
  13sdk                                                                                     8:160  0         0 disk
  14└─360014052ab23b1cee074fe38059d7c94                                                   253:39   0   100G  0 mpath
  15
  16# find all disks from LUN ID
  17LUN_ID="360014054ce7e566a01d44c1a4758b092"
  18list_disk=$(dmsetup deps -o devname ${LUN_ID}| cut -f 2 |cut -c 3- |tr -d "()" | tr " " "\n")
  19echo ${list_disk}
  20
  21# Remove from multipath 
  22multipath -f "${LUN_ID}"
  23
  24# remove disk 
  25for i in ${list_disk}; do echo ${i}; blockdev --flushbufs /dev/${i}; echo 1 > /sys/block/${i}/device/delete; done
  26
  27# You can which disk link with which LUN on CEPH side 
  28ls -l /dev/disk/by-*
  

  NFS for OLVM/oVirt

  Since oVirt need a shared stockage, we can create a local NFS to bypass this point if no Storage bay.

• Administration

  Hosted-engine Administration

  • Connect to VM hosted-engine with root and password setup during the install:

   1# Generate a backup 
   2engine-backup --scope=all --mode=backup --file=/root/backup --log=/root/backuplog
   3
   4# Restore from a backup on Fresh install
   5engine-backup --mode=restore --file=file_name --log=log_file_name --provision-db --restore-permissions
   6engine-setup
   7
   8# Restore a backup on existing install
   9engine-cleanup
  10engine-backup --mode=restore --file=file_name --log=log_file_name --restore-permissions
  11engine-setup
  

  host Administration

  • Connect in ssh to the Host:

   1# Pass a host in maintenance mode manually
   2hosted-engine --vm-status
   3hosted-engine --set-maintenance --mode=global
   4hosted-engine --vm-status
   5
   6# Remove maintenance mode
   7hosted-engine --set-maintenance --mode=none
   8hosted-engine --vm-status
   9
  10# upgrade hosted-engine
  11hosted-engine --set-maintenance --mode=none
  12hosted-engine --vm-status
  13engine-upgrade-check
  14dnf update ovirt\*setup\* # update the setup package
  15engine-setup # launch it to update the engine
  

  • /!\ Connect individually to KVM Virtmanager does not work OVirt use libvirt but not like KVM do…

• Install

  Prerequisistes

  • Check Compatibilty hardware: Oracle Linux Hardware Certification List (HCL)

  • A minimum of two (2) KVM hosts and no more than seven (7).

  • A fully-qualified domain name for your engine and host with forward and reverse lookup records set in the DNS.

  • /var/tmp 10 GB space at least

  • Prepared a shared-storage (nfs or iscsi) of at least 74 GB to be used as a data storage domain dedicated to the engine virtual machine. ISCSI need to be discovered before oVirt install.