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Storage

Storage types

  • Network storage
    • LVM Group on iSCSI
      • can be shared
    • iSCSI target / iSCSI direct (user-level library libiscsi2)
    • NFS
    • Ceph RDB
    • GlusterFS
  • Local storage
    • LVM Group overy any block device
      • LVM Thin pools: only on LOCAL - cannot be shared!
    • Directory (storage on existing FS)
    • ZFS

Content types

  • tbd

Local storage

  • Backups - /var/lib/vz/dump
  • ISOs - /var/lib/vz/template/iso
  • Images - /var/lib/vz/images
  • Templates - /var/lib/vz/template/cache

iSCSI

iSCSI target/direct is capable to store only following content types

  • images
  • none
iSCSI is a block level type storage, and provides no management interface. So it is usually best to export one big LUN, and setup LVM on top of that LUN. You can then use the LVM plugin to manage the storage on that iSCSI LUN.

iSCSI+LVM supports HA and Live Migration of VMs –> mark LVM storage as shared