Comparison

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Feature comparison of different virtualization solutions

Feature Description OpenVZ (stable) Virtuozzo 6 (PCS 6) Virtuozzo 7 Virtuozzo 7 Plus LXC Proxmox VE Microsoft Hyper-V 2012 R2 RHEV 3.5 Citrix XenServer 6.5
1. Virtualization platform
1.1. Overview
HW virtualization support (Hypervisor) Full emulation of underneath hardware level: full isolation guest environment, no dependencies from host OS, overhead for hypervisor layer. No Yes Yes Yes No Yes Yes Yes Yes
OS-level virtualization (Containers) Sharing the same instance of host OS: high density, high performance, high dependencies from host OS. Yes Yes Yes Yes Yes Yes No No No
Hypervisor technology Technology that enables to run Virtual Machines. None Parallels Desktop Monitor KVM KVM None KVM Hyper-V KVM Xen
Containers technology Technology that enables to run Containers. Virtuozzo Containers Virtuozzo Containers with enhancements Virtuozzo Containers with enhancements Virtuozzo Containers with enhancements Linux containers LXC (moved from OpenVZ since 4.0) None None None
1.2. Memory
Memory Overcommit Ability to present more memory to virtual machines than physically available Yes Yes Yes Yes Yes Yes Yes Yes Yes
Page sharing Memory (RAM) savings through sharing identical memory pages across virtual machines Yes Yes, only for CTs Yes Yes Yes Yes No Yes No
2. Management
2.1. General
Unified management tool for CTs and VMs Single tool for managing both containers and virtual machines (if applicable) None Yes Yes Yes None No None None None
Central Management tool Is centralized multi-server management available for this edition? Yes, 3rd party Yes, Parallels Virtual Automation (PVA) No Yes, PVA Yes, 3rd party Yes Yes, System Center Virtual Machine Manager Yes, RHEV Manager Yes, XenCenter
2.2. Upgrade & Backup
Update Management Integrated patching mechanism for the virtual environments (Guest OS) / guest tools / templates No integrated update, YUM (Linux) No integrated update, YUM (Linux), WSUS (Windows) No integrated update, YUM (Linux), WSUS (Windows) No integrated update, YUM (Linux), WSUS (Windows) No integrated update, APT (Linux) No integrated update, YUM (Linux), WSUS (Windows) Yes (WSUS, SCCM, Virtual Machine Servicing Tool 2012 for offline VM update) No integrated update, YUM (Linux), WSUS (Windows) No integrated update, YUM (Linux), WSUS (Windows)
Live VE snapshot Ability to take a snapshot of a virtual environment while the guest OS is running (e.g. for roll-back or backup purposes) Yes Yes Yes Yes Offline, CRIU support is planned Yes Yes Yes Yes
Integrated Backup Are backup plugins/tools provided to backup virtual environments (over and above the ability to perform classic backup using agents in the guests) No Yes No Yes No Yes Yes No No
Backup Integration API Integration with 3rd party backup applications for backup of the virtual environment. No (only through snapshots) Yes Yes Yes No (only through snapshots) Yes (vzdump) Yes Yes No
2.3. Others
VEs Templates (VM, CT) Ability to create and store master images and deploy virtual machines from them Yes (CT only) Yes Yes Yes Yes (OpenVZ templates) Yes Yes Yes Yes
P2V migration Integrated or added P2V (or V2V) capability in order to convert physical systems to virtual environment. No Yes Yes Yes No No, 3rd party tools Yes No No
3. VE Mobility and HA
3.1. VE Mobility
Live Migration of VEs Ability to migrate virtual machines between hosts without perceived downtime Yes, but with no zero downtime Yes, Kernal-Level Migration Yes, CRIU Yes, CRIU Offline, CRIU support is planned Yes Yes Yes Yes
Automated Live Migration (DRS) Ability to put host into maintenance mode which will automatically live migrate all virtual machines onto other available hosts so that the host can be brought shut down safely No No No Yes No No Yes Yes Yes
Storage Migration Integrated Power Management features Ability to automatically migrate vms onto fewer hosts and power off unused capacity (hosts), wake systems back up when required No No No No No No Yes Yes Yes
3.2. HA / DR
Cluster size Maximum number of hosts in the cluster/pool relationship and maximum number vms per cluster/pool (if specified) None 32 hosts/cluster validated (100 hosts/cluster maximum) - PStorage limitation Not tested yet Not tested yet None 32 nodes 64 nodes 200 nodes 16 nodes
Integrated HA Recover virtual environment in case of host failures through restart on alternative hosts (downtime = restart time) No Yes No Yes No Yes Yes Yes Yes
Site Failover Integrated ability to (ideally live) migrate virtual machine data (virtual disk files) to different storage e.g. for array upgrades/migration and I/O management No No No No No No Manual No Integrated Disaster Recovery - manual
4. Network and Storage
4.1. Storage
Supported Storage Supported types of Storage (DAS: Direct Attached Storage, NAS: Network Attached Storage, FC: Fibre Channel, iSCSI, FCoE - Fibre Channel over Ethernet) DAS (EXT4) NAS (NFS), DAS (EXT4) DAS (EXT4) NAS (NFS), DAS (EXT4) NAS (NFS), DAS (EXT4) SAN, NAS (NFS), Ceph  DAS, NAS (SMB), SAN (iSCSI, FC, FCoE) DAS, NAS (NFS), SAN (iSCSI, FC, FCoE) DAS, NAS (NFS), SAN (iSCSI, FC, FCoE)
Virtual Disk Format Supported format(s) of the virtual disks for the virtual machines CT - ploop CT - ploop, VM - ploop CT - ploop, VM - ploop\Qcow2 CT - ploop, VM - ploop\Qcow2 Any qcow2 vhdx, vhd, pass-though (raw) Qcow2, raw disk vhd, raw disk
Thin Disk Provisioning Ability to over-commit overall disk space by dynamically growing the size of virtual disks based on actual usage rather than pre-allocating full size. Yes Yes Yes Yes Yes, depends on disk format (dm-thin) Yes (???) Yes Yes Yes
Virtual SAN Enhanced storage capability e.g. providing a virtual SAN through virtualized 'local' storage Yes, Virtuozzo Storage Yes, Virtuozzo Storage Yes, Virtuozzo Storage Yes, Virtuozzo Storage Yes, but 3rd party (DRBD 9, Ceph, GlusterFS) Yes, but 3rd party (DRBD 9, Ceph, GlusterFS) Yes, Storage Spaces Yes, Red Hat Storage No
Storage QoS Ability to control Quality of Service for Storage I/O for virtual machines No Only IOPs limits Only IOPs limits Only IOPs limits No No Yes Yes Yes
4.2. Network
Advanced Network Switch Centralized virtual network configuration (rather than managing virtual switches on individual hosts), typically with enhanced networking capabilities No No No No No Yes, Open vSwitch support Yes OpenStack Neutron Integration Open vSwitch integration
Network QoS Ability to create and store master images and deploy virtual machines from them Only bandwidth limits Only bandwidth limits Only bandwidth limits Only bandwidth limits Only bandwidth limits Yes, with Open vSwitch  Yes Yes Yes
5. Others – most of features are relevant only for Odin Virtuozzo editions
Memory deduplication for binary files Memory and IOPS deduplication management that enables/disables caching for Container directories and files, verifies cache integrity, checks Containers for cache errors, and purges the cache if needed No Yes, pfcache Yes, pfcache Yes, pfcache No No None None None
Completely isolated disk subsystem for CTs Yes, ploop Yes, ploop Yes, ploop Yes, ploop Yes, with LVM No None None None
API\SDK OpenVZ API for Ruby, LibVirt Virtuozzo SDK, LibVirt Virtuozzo SDK, LibVirt Virtuozzo SDK, LibVirt LibLXC, API for Ruby, Python 2, Haskell, Go Proxmox VE uses a REST like API (JSON data format) Windows SDK RHEV-M API: REST API, SDKs XenAPI, XenServer SDKs
Image Catalog integration Integration with 3rd-party image catalog services of popular server applications and development environments that can be installed with one click. No No No Yes (Bitnami) No Yes (Turnkey) None None None
Open Stack integration Driver for Open Stack Nova Yes Yes Yes Yes Yes (LXC and KVM supported through libvirt) Yes Yes Yes
Kernel maintenance Ability to upgrade kernel with minimal downtime. KernelCare service integration kernel rebootless update (vzreboot) KernelCare service integration kernel rebootless update (vzreboot) KernelCare service integration KernelCare service integration None KernelCare service integration KernelCare service integration
Power Panel A tool used for managing particular virtual machines and containers by their end users. No Yes No Yes None None None None None
6. Commercial
Open Source Yes No Yes No Yes Yes No No No (but there is Open Source edition)
License\Subscription No Yes No Yes No No Yes Yes Yes, Enterprise Edition
Support Both community and commercial support Commercial support Community support Commercial Support Yes, Canonical Ltd. Both community and commercial support Commercial support Commercial support Both community and commercial support