StorMagic SvSAN: A virtual SAN made simple
StorMagic SvSAN is a virtual SAN – a software-defined solution designed to run on two or more servers and deliver highly available shared
SvSAN simplifies your IT infrastructure. It eliminates the need for a physical SAN, enabling hyperconvergence by virtualizing the internal
compute and storage of any x86 server and presenting it via a hypervisor as shared storage.
A typical two-node SvSAN configuration, with a centralized management interface and witness, is shown in fig. 1.
This data sheet is broken down into four sections, covering SvSAN’s features, its requirements, hardware and software compatibility and finally support levels.
For a greater technical examination of StorMagic SvSAN, including deployment options and use cases, please refer to the SvSAN Technical Overview white paper.
StorMagic SvSAN has a range of features enabling the storage architect to get the most out of their infrastructure. These features are detailed in the table at the end of this document.
All of the features necessary for highly available shared storage are included in an SvSAN license. There are also two performance and security-enhancing add-ons available, which are SvSAN’s caching and data encryption features. Many of these features are covered in more detail within their own white papers. View the full range on the StorMagic website.
SvSAN’s caching features include write-back and read-ahead caching, as well as data pinning. Collectively these features are known as Predictive Storage Caching and can dramatically improve an organization’s storage performance without requiring significant investment in new hardware.
SvSAN’s data encryption feature enables organizations to encrypt the data being mirrored by SvSAN. This allows vulnerable edge sites and the data they hold to be protected. It is FIPS 140-2 compliant, eliminates the need for expensive OS or hypervisor-level solutions, and is compatible with any KMS that uses KMIP, including StorMagic’s own key manager, SvKMS.
StorMagic SvSAN is licensed based on the usable VSA storage capacity. License tiers are set at 2TB, 6TB, 12TB and Unlimited TB.
SvSAN licenses are perpetual – after a single payment they can be used forever. Ongoing costs concern only support renewal payments.
Pricing is based on a single SvSAN license – the number of nodes in the cluster defines how many licenses are required. For example, two SvSAN licenses are required for a normal 2-node deployment.
A free, fully functional evaluation of SvSAN is available to download, enabling organizations to trial and experience the features and benefits of SvSAN, before purchasing.
For more information and to download an evaluation copy, visit: stormagic.com/trial
SvSAN has the following minimum hardware requirements:
|CPU||1 x virtual CPU core1
• 2GHz or higher reserved
|Disk||2 x virtual storage devices used by VSA
• 1 x 512MB Boot device
• 1 x 20GB Journal Disk
|Network||1 x 1Gb Ethernet
• Multiple interfaces required for resiliency
• 10Gb Ethernet is supported
• Jumbo frames supported
1When using SvSAN’s data encryption to encrypt data, 2+ virtual CPUs are recommended
2Additional RAM may be required when caching is enabled
Witness system requirements
The witness sits separately from the SvSAN nodes and therefore has its own minimum requirements:
|CPU||1 x virtual CPU core (1 GHz)|
|Network||1 x 1Gb Ethernet NIC
When using the witness over a WAN link use the following for optimal operation:
• Latency of less than 3000ms, this would allow the witness to be located anywhere in the world
• 9Kb/s of available network bandwidth between the VSA and witness (less than 100 bytes of data is transmitted per second)
|Operating System||The SvSAN witness can be deployed onto a physical server or virtual machine with the following:
• Windows Server 2016 (64-bit)
• Hyper-V Server 2016 (64-bit)
• Raspbian Buster (32-bit)
• vCenter Server Appliance (vCSA)1
• StorMagic SvSAN Witness Appliance
• CentOS 7.6 & 8.0
• RHEL 7.6 & 8.0
1VMware vSphere 5.5 and higher
NOTE: The witness should be installed onto a server separate from the SvSAN VSA.
Hardware and software compatibility
SvSAN works with any x86 server that exists on the VMware vSphere ESXi or Microsoft Hyper-V Hardware Compatibility List (HCL). Furthermore, SvSAN will work with any supported internal server disk storage or JBOD array.
SvSAN supports VMware vSphere, Microsoft Hyper-V and Linux KVM hypervisors. It is installed as a Virtual Storage Appliance (VSA) requiring minimal server resources to provide the shared storage necessary to enable the advanced hypervisor features.
SvSAN is supported on the following versions of VMware vSphere ESXi and Microsoft Windows Server/Hyper-V Server:
|VMware||vSphere 7.0 & updates||1|
|vSphere 6.7 & updates|
|vSphere 6.5 & updates|
|vSphere 6.0 & updates|
|Microsoft||Windows Server 2016|
|Hyper-V Server 2016|
|Linux KVM||CentOS 8.0||3|
1vSphere 7.0 compatibility is available from SvSAN 6.2 Update 2 Patch 2 onwards.
2Linux KVM compatibility is available for SvSAN 6.2 Patch 5 and onwards.
3RHEL/CentOS 8.0 compatibility is only available from SvSAN 6.2 Update 2 onwards.
If VMware vSphere is chosen as the hypervisor to deploy with SvSAN, StorMagic recommends vSphere Essentials Plus as a minimum to enable high availability.
For further details of SvSAN’s capabilities on KVM hypervisors, please refer to the SvSAN with KVM data sheet.
VMware vCenter support
With the dedicated plugin, SvSAN can be managed directly from VMware vCenter. SvSAN is compatible with the following versions of vCenter:
|VMware vCenter version||SvSAN version|
|VMware vCenter Server 7.0 & updates|
|VMware vCenter Server 6.7 & updates|
|VMware vCenter Server 6.5 & updates|
|VMware vCenter Server 6.0 & updates|
SvSAN Maintenance & Support
SvSAN Maintenance & Support provides organizations with access to StorMagic support resources, including product updates, knowledgebase access and email support with our technical support staff.
Two levels are available. A summary of each is shown in the table below:
|Gold Support||Platinum Support|
|Hours of operation||8 hours a day1 (Mon – Fri)||24 hours a day2, (7 days a week)|
|Length of service||1, 3 or 5 years||1, 3 or 5 years|
|Access method||Email + Telephone (via platinum engagement form on
|Response method||Email + WebEx||Email + Telephone + WebEx|
|Remote support / WebEx||Yes||Yes|
|Maximum number of support administrators per contract||2||4|
|Response time||4 hours||1 hour|
1Gold Support is only available from 07:00 UTC/DST to 01:00 UTC/DST. If your business hours fall outside this window, you must purchase Platinum Support.
2Global, 24×7 support for Severity 1 – Critical Down & Severity 2 Degraded issues
More information on SvSAN Maintenance & Support can be found at stormagic.com/svsan/support.
|Synchronous mirroring/high availability
• Data is written to two SvSAN VSA nodes to ensure service uptime
• Write operations only complete once acknowledged on both SvSAN VSAs
• In the event of a failure, applications are failed over to other available resources
|Stretched/metro cluster support – white paper with more information
• Separate nodes geographically to provide an added layer of resiliency
• Different racks, separate rooms or buildings, or even across an entire city
|Volume migration – white paper with more information
• Transparently and non-disruptively migrate volumes from one storage location to another
• Simple and mirrored volumes can be migrated between storage pools on the same SvSAN VSA node or to another SvSAN VSA node entirely
|VMware Fault Tolerance feature
• SvSAN deployed on VMware vSphere hypervisor enables the usage of VMware’s Fault Tolerance feature on clusters of just two nodes
• Fault Tolerance protected VMs see zero downtime or loss of service when one node goes offline
• Keep critical applications online and running in the event of a node failure
|VSA restore (VMware only)
• Automates the recovery process of an SvSAN VSA node following a server failure or replacement
• SvSAN VSA configuration changes are tracked and stored on another SvSAN VSA in the cluster
• Mirror targets are rebuilt and resynchronized, enabling a quick return to optimal service
• Simple targets can be automatically recreated, ready for data recovery from backup
|VMware vSphere Storage API (VAAI) support (VMware only)
• Accelerating VMware I/O operations by offloading them to SvSAN
• Supports the Write Same, Atomic Test & Set (ATS) and UNMAP primitives
|Centralized monitoring and management
• Monitor and manage SvSAN from a single location with multiple options including WebGUI
• Seamless integration with vCenter Web Client enabling alerts to be forwarded and captured on one screen
• Email alert notifications using SMTP, and SNMP integration with support for v2 and v3
|Witness – white paper with more information
• Acts as a quorum or tiebreaker and assists cluster leadership elections to prevent “split-brain”
• Hundreds of locations can share a single witness and it tolerates low bandwidth, high latency WAN links
• Supported configurations include local witness, remote shared witness or no witness
|I/O performance statistics
• Provides granular, historical I/O transaction, throughput and latency statistics for each volume
• Simple, intuitive graphical presentation with minimum, maximum, and average values for daily, monthly, yearly time periods
• Data can be exported to CSV for further analysis
|Multiple VSA GUI deployment and upgrade
• Deploy and upgrade VSAs through a single wizard either immediately or in a staged approach for out-of-hours activity
• SvSAN handles dependencies and performs a health check ensuring there is no impact to environments
|PowerShell script generation
• Deployments over many locations can be handled by generating a custom PowerShell script
|Additional add-on features available|
|Predictive read ahead caching (SSD and memory) – white paper with more information
• Beneficial to sequential read workloads – populates memory with data prior to being requested
• Boosts performance by reducing I/O requests going to disk, instead serving data from low latency memory
|Write back caching (SSD) – white paper with more information
• Utilizes SSDs to improve the performance of all write operations by lowering latencies and increasing the effective IOPS, resulting in faster response times, especially for random write workloads
• All write I/O’s are directed to the SSD allowing completion to be immediately acknowledged back to the server, at a later time the data is written from SSD to the hard disk
|Data pinning – white paper with more information
• Allows data to permanently reside in memory, ensuring that data is always available in the highest performing, lowest latency cache tier, useful for frequently repeated operations such as booting virtual machines
• Intelligent caching algorithms identify ‘hot’ and ‘cold’ data, elevating the ‘hot’ data to the highest performing, lowest latency storage tier (SSD or memory)
|Data encryption – data sheet with more information
• Utilizes a FIPS 140-2 compliant algorithm (XTS-AES-256) to deliver encryption to all data handled by SvSAN or just selected volumes
• Allows secure erasure and re-key
• Compatible with any KMIP-compliant key management system including StorMagic SvKMS