Introduction to Virtuozzo

Manage all of your virtualization solutions from a single platform. Flexibility to build offers using only the components you want. Target application developers, up-sell storage to existing customers, and more.
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By combining container, hypervisor and storage virtualization in to a single solution, Virtuozzo uniquely delivers several key features to service providers and their customers.

Memory and IOPS deduplication

  • Efficiently caches identical files found in multiple containers to reduce I/O and memory bottlenecks and increase the number of running containers per server

Rebootless updates

  • Eliminates service outages for end users during system updates

Pre-Installed application templates

  • Pre-install application templates to OS EZ template caches to speed up containers creation

Single image file storage

  • Enables fast server migrations and backups
  • Improves server performance

Auto Recovery

  • Recovers damaged, lost, or inaccessible data replicas below the configured replication level if a drive/node fails

Data Protection

  • Provides user data check-summing and verification
  • Performs background data verification “scrubbing” to ensure that all data is still readable and correct

SSD Caching

  • Bursts I/O performance by an order of magnitude, increasing hardware utilization and density

Storage cluster rebalancing

  • When new storage servers are introduced into a cluster or come online after failure, the system will rebalance the storage across the total cluster


Virtuozzo is a high-security, high-performance virtualization solution that combines containers and storage to give service providers a single, cost-effective platform for delivering high-availability cloud services to their customers. Applications can be deployed on it and then transferred to the cloud, where they can be moved around as needed. It is ideal for service providers who want to capitalize on emerging, container-dependent technologies that will help them build new offerings for businesses and cloud application developers.

With Virtuozzo containers:

Service providers and developers have a high-security, low-cost infrastructure solution uniquely suited to server virtualization and cloud application development that will help them modernize their infrastructure for customer needs today and tomorrow.

Increase revenues per physical server

  • Deliver 3x more virtual servers than hypervisor solutions, providing greater utilization of existing infrastructure

Reduce server maintenance costs by 75%

  • Centralize management to enable fast and efficient operating system updates and upgrades.

Increase Application Performance by 50%

  • Enable near-native server performance, delivering maximum application performance and scalability

Provision new servers quickly

  • Make new servers available within minutes of a customer order and have them instantly on with no operating system boot-up time

With Virtuozzo hypervisor:

Service providers have the flexibility to create virtual machines for customers who prefer to deploy and maintain a variety of operating systems. Virtuozzo hypervisor allows service providers to simultaneously run multiple virtual machines and containers on the same physical server, thereby making more efficient use of hardware resources. Offering a hardware virtualization option in addition to operating system virtualization with containers gives service providers the freedom to choose the most appropriate technology for specific customer needs.

With Virtuozzo storage:

Service providers can maintain high server availability and performance, with elasticity and scalability for changing customer needs, all at a lower cost than direct attached storage and network attached storage alternatives.

Get the most of out of storage investments

  • Distribute storage from existing hard drives across all hardware nodes
  • Turn unused disk space on those nodes in to a single pooled storage cluster
  • Reduce extra maintenance and support costs by lowering additional storage infrastructure needs

Eliminate virtual private server downtime due to hardware outages

  • Replicate storage and distribute it in to a cluster
  • Automatically move virtual private servers from a failed node to a functional node to keep them operational using the storage cluster

Frequently Asked Questions

Introductory Information

  1. 1.
    What is Virtuozzo?

    Virtuozzo is a high-security, high-performance virtualization solution that combines containers and storage to give service providers a single, cost-effective platform for delivering high-availability cloud services to their customers.

  2. 2.
    What happened to Parallels Cloud Server? Is it still supported?

    Parallels Cloud Server has become Virtuozzo. However, much of the technical product documentation for it will continue to refer to Parallels Cloud Server instead of Virtuozzo until additional product updates are made. Yes, it is still supported, without any changes to your existing support agreement.

  3. 3.
    I’ve been using Parallels Cloud Server. Do I need to upgrade to Virtuozzo?

    No. Virtuozzo is the new name for Parallels Cloud Server. However, our recommendation is that you download Update 9 in order to get the latest bug fixes and capabilities, including support for Docker.

  4. 4.
    Who is the ideal customer for Virtuozzo?

    Virtuozzo is designed for hosting providers who want to dramatically improve server security, performance and availability while reducing costs. It is ideal for service providers who want to capitalize on emerging, container-dependent technologies that will help them build new offerings for businesses and cloud application developers.

  5. 5.
    Do I need to buy additional storage for Virtuozzo?

    No, Virtuozzo eliminates the need for external storage devices typically used in SANs by converting locally attached storage from multiple nodes into shared storage.

  6. 6.
    How does Virtuozzo storage work?

    Virtuozzo storage allows service providers to build a reliable, highly-available, distributed shared storage cluster which performs similar to a SAN. However, it is much more cost effective since it uses existing hard drives in your current servers, eliminating the need for the dedicated shared storage hardware normally required by SANs and providing the lowest cost cloud storage available. With Virtuozzo storage, you can eliminate VPS downtime due to HDD and RAID failures, provide high availability servers, perform instant live migration of servers between physical hosts, and scale available storage beyond locally available disk space.

  7. 7.
    Can I deploy hypervisors and containers on the same physical node with Virtuozzo?

    Yes, Virtuozzo allows you to specify the number of hypervisors and containers that you can deploy on the hardware node.

  8. 8.
    Can I deploy Windows VPS offerings using Virtuozzo?

    Yes, hypervisor functionality in Virtuozzo allows you to deploy Windows within the hypervisor, enabling Windows VPS offerings that can leverage the high performance and availability of Virtuozzo.


  1. 9.
    How is Virtuozzo licensed?

    Virtuozzo licensing is scalable to meet the needs of service providers. Containers and virtual machines are licensed based on the number of servers per node. Storage licensing is based on the amount of enabled storage in 100 GB increments, to allow easy scalability as demand grows.

  2. 10.
    How can I get a trial version of Virtuozzo?

    You can download a trial version here.

  3. 11.
    Is there a limit on the number of storage nodes?

    There is no strict limit on the number of storage nodes. However, we recommend limiting the servers in the cluster to a single rack to avoid any possible performance degradation that can occur with inter-rack communications.

  4. 12.
    What is the limit on total disk space?

    Virtuozzo can scale to support up to 1 PB of effective available disk space, which means up to 3PB of physical disk space in the case of mirroring with 3 copies.

  5. 13.
    Can I add more nodes or storage capacity to an existing Virtuozzo storage cluster?

    Virtuozzo storage can scale to support up to 1 PB of effective available disk space, which means up to 3PB of physical disk space in the case of mirroring with 3 copies.

  6. 14.
    What is the expected performance of Virtuozzo storage?

    The performance will depend on the hard disks used and the network speed. However, the performance should comparable to locally attached storage, and in some cases it will be better. Additionally, Virtuozzo storage supports advanced SSD caching which increases the performance of commodity hardware by adding small, inexpensive SSD drives to the cluster for caching purposes.

  7. 15.
    Does the addition of new storage nodes or disks improve the overall performance for existing users?

    Yes, since data is distributed among all hard drives in the cluster, applications performing random I/O will experience an increase in IOPS when more drives are added to the cluster. Even a single client machine may get noticeable benefits by increasing the number of storage nodes and achieve performance far beyond traditional local attached storage.

Storage availability

  1. 16.
    Does Virtuozzo protect server data?

    Virtuozzo storage protects against data loss or temporary unavailability by mirroring data to a specified number of copies (replicas) placed on different machines to protect the data from single point hardware and control failures. To provide additional reliability, Virtuozzo can be configured to maintain user data checksums and verify them on access and on an ongoing basis.

  2. 17.
    What happens when a disk is lost or a server node is unavailable for whatever reason?

    Virtuozzo storage automatically recovers from a degraded state to the specified redundancy level by replicating data on live nodes. Data access is still available during the recovery.

  3. 18.
    How quickly does Virtuozzo recover from a degraded state?

    Since Virtuozzo recovers from a degraded state using all the available hard disks in the cluster, this process is much faster than with traditional locally attached RAIDs.

  4. 19.
    Can I change redundancy settings on the fly?

    Yes, you can change the number of data copies, and Virtuozzo will dynamically adjust by creating new copies or removing unneeded ones.

  5. 20.
    Do I still need to use local RAID?

    No. Virtuozzo provides the same built-in data redundancy as a mirror RAID1 array with multiple copies. However, for better sequential performance it is possible to use local stripping RAID0 exported to the Virtuozzo storage cluster.

  6. 21.
    Does Virtuozzo have redundancy levels similar to RAID5?

    No, it is not possible to build a reliable software-based RAID5 system without also including special hardware capabilities like backup power batteries. In the future, Virtuozzo may provide RAID5 level redundancy for read-only data such as backups.

  7. 22.
    What is the recommended number of data copies?

    We recommend configuring Virtuozzo to maintain 2 or 3 copies, which allows the storage system to survive the simultaneous loss of 1 or 2 hard drives.

Compatibility and Requirements

  1. 23.
    What are the hardware requirements for Virtuozzo storage?

    Virtuozzo storage does not require any special hardware and can run on commodity nodes with traditional SATA drives and 1Gbit ethernet networks. Some hard drives and RAID controllers ignore the FLUSH command to imitate better performance and must not be used as this may lead to file system or database corruptions. This is especially true for RAID controllers and SSD drives. Please consult with the drive manual to make sure you use reliable hardware.

  2. 24.
    Can I run Virtuozzo storage with just one node?

    Yes, but this does not provide any advantages over locally attached storage, except for the ability to seamlessly grow to multi-node configurations and to take advantage of Virtuozzo storage caching features.

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