StorMagic SvSAN: A virtual SAN made simple
StorMagic SvSAN is a software-defined storage solution designed to run on two or more servers. It is uniquely architected with the combination of a light footprint, availability out-of-the-box, uncompromising performance and centralized management and deployment across a remote and branch office environment.
SvSAN eliminates the need for a physical SAN which are costly, complex and present a single point of failure. With high availability out-of-the-box, business critical applications and IT services suffer no downtime and the removal of a SAN along with the low cost of commodity servers and storage lowers IT acquisition and operating cost. Thousands of large organizations and SMEs across 72 countries have already chosen SvSAN to modernize their IT infrastructure.
SvSAN supports the industry leading hypervisors, VMware vSphere and Microsoft Hyper-V. 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 such as High-Availability/Failover Cluster, vMotion/Live Migration and VMware® Distributed Resource Scheduler (DRS)/Dynamic Optimization.
SvSAN can be deployed as a simple 2-node cluster, with the flexibility to meet changing capacity and performance needs. This is achieved by adding additional capacity to existing servers or by growing the SvSAN cluster, without impacting service availability. A typical 2-node SvSAN configuration is shown below:
SvSAN features overview
Synchronous mirroring/High availability
SvSAN synchronous mirroring ensures data is written to two SvSAN VSA nodes to protect against hardware failures and to ensure service uptime. Write operations only complete once acknowledged on both SvSAN VSAs. SvSAN clustering delivers the availability required by critical applications through monitoring the health of the SvSAN infrastructure and failing over the service to other available resources in the event of a hardware failure.
Stretched/Metro cluster support
SvSAN stretched clusters provide additional levels of resiliency eliminating the data center from being the single point of failure. VSAs can be geographically separated enabling copies of data to be stored in two separate locations.
The SvSAN volume migration feature transparently and non-disruptively migrates volumes from one storage location to another. Both simple and mirrored targets can be migrated between storage pools on the same SvSAN VSA node or to another SvSAN VSA node entirely. Users can ensure that storage targets are optimally distributed and load-balanced over all the available SvSAN resources.
VSA restore (VMware only)
SvSAN VSA Restore simplifies and automates the recovery process of a SvSAN VSA node following a server failure or replacement, speeding up the recovery process and reducing the time to return storage to its optimal state.
• All SvSAN VSA configuration changes are automatically tracked and stored on another SvSAN VSA in the same cluster
• Mirror targets are automatically rebuilt and resynchronized, enabling highly available shared storage to be quickly returned to optimal service
• Simple targets can be automatically recreated, ready for data recovery from backup
VMware vSphere storage APIs – array integration (VAAI) support (VMware only)
Accelerating VMware I/O operations by offloading them to SvSAN.
• Supports the Write Same and Atomic Test & Set (ATS) primitives
Atomic Test & Set (ATS)
An enhanced locking mechanism designed to replace the use of SCSI reservations on VMFS volumes that provides granular locking of disk sectors rather than the whole disk, reducing disk contention issues and allows VMFS volumes to scale to much larger sizes.
One of the most common virtual disk operations and is used to zero portions of the disk for:
• Cloning operations for “eagerzeroedthick” virtual disks
• Allocating new file blocks for thin provisioned virtual disks
• Initializing previous unwritten file blocks for “zerothick” virtual disks
Centralized monitoring and management
Monitor & manage SvSAN VSAs remotely from a single location. Multiple management options including WebGUI to perform individual VSA point management.
• PowerShell CLI for automated scripted VSA deployments, configuration, and management
• SvSAN plug-in provides seamless Integration with the VMware vCenter Web Client enabling alerts to be forwarded and captured on a single pane of glass
• Email Alert Notification using SMTP
• SNMP Integration with support for v2 & v3
The remote witness acts as a quorum or tiebreaker and assists cluster leadership elections to eliminate “split-brain” scenarios.
A single witness can be shared between multiple remote sites and employs a lightweight communication protocol, making efficient use of the available network connectivity allowing it to tolerate low bandwidth, high latency WAN links.
A number of supported witness configurations are available including, local quorum, remote shared quorum or no quorum to suit different customer requirements.
I/O performance statistics
I/O performance statistics provide granular, historical I/O transaction, throughput and latency statistics for each volume, simplifying the troubleshooting of I/O performance issues, or identify I/O trends or patterns.
• Simple, intuitive graphical presentation
• Per iSCSI target statistics
• Displays minimum, maximum, and average values for daily, monthly, yearly time periods
• Data can be exported to CSV for further analysis
Multiple VSA deployment and upgrade
SvSAN has added improvements to the VSA deployment and upgrades. including the ability to deploy multiple VSAs through a single wizard, reducing the time to deploy SvSAN.
In addition to initial deployment, enhancements have been made to the StorMagic dashboard enabling multiple VSAs to be upgraded at the same time. Firmware is selected from a repository and installed onto multiple VSAs. This can be installed immediately or staged where the firmware is uploaded to the VSA in preparation for a later upgrade, for example, out-of-hours.
SvSAN handles the dependencies and performs a health check ensuring that there is no impact to environments during upgrades.
PowerShell script generation
When deploying SvSAN via the GUI it is now possible to automatically generate a custom PowerShell script. These scripts can then be used for mass deployments for large environments removing the need for user interaction.
Predictive Storage Caching
SvSAN includes several I/O acceleration features using both SSD and memory, collectively known as Predictive Storage Caching. These leverage intelligent patent-pending algorithms and include write back SSD caching, predictive read ahead caching and data pinning. These can be used independently or together depending on the application requirements.
Write back caching 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.
Predictive read ahead caching is primarily beneficial to sequential read workloads with the aim to populate a small amount of memory with data prior to being requested. This approach improves storage performance by reducing the number of I/O requests going to disk and serving data from low latency memory.
Data pinning allows data to permanently reside in memory, ensuring that data is always available in the highest performing, lowest latency cache tier. This is particularly suitable for operations that are frequently repeated, for example booting virtual machines or end of month processing, as it allows the memory cache to be “pre-warmed” ahead of time.
The intelligent caching algorithms ensure the efficient use of all available cache resources. This is achieved by identifying only the frequently read data or ‘hot’ data, and promoting it to the highest performing, lowest latency storage tier (memory or SSD). Infrequently read or ‘cold’ data remains on the lowest cost, high capacity storage (hard disk). This process stores meta-data about access frequency in any available memory location that is not being used for read-ahead or data pinning.
SvSAN system requirements
SvSAN has the following minimum hardware requirements:
|CPU||1 x virtual CPU core
• 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
1Additional RAM required when caching is enabled
SvSAN works with any x86 server that exists on the VMware vSphere ESXi or Microsoft Hyper V Hardware Compatibility List (HCL). SvSAN will work with any supported internal server disk storage or JBOD array.
SvSAN works with industry standard hypervisors and is supported on the following versions of VMware vSphere ESXi and Microsoft Windows Server/Hyper-V Server:
|VMware||VMware vSphere 5.5 & updates|
|VMware vSphere 6.0 & updates|
|VMware vSphere 6.5 & updates|
|Microsoft||Microsoft Windows Server 2012|
|Microsoft Hyper-V Server 2012|
|Microsoft Windows Server 2012 R2|
|Microsoft Hyper-V Server 2012 R2|
|Microsoft Windows Server 2016|
|Microsoft Hyper-V Server 2016|
VMware vCenter support
|VMware vCenter version||5.1||5.2||5.3||6.0||6.1|
|VMware vCenter Server 5.5 & updates|
|VMware vCenter Server 6.0 & updates|
|VMware vCenter Server 6.5 & updates|
Witness operating system requirements
The SvSAN remote witness can be installed onto a physical server or virtual machine with the following operating systems:
|Microsoft Windows Server 2012 R2 (64-bit)||Raspbian Jessie (32-bit)1|
|Microsoft Hyper-V Server 2012 R2 (64-bit)||VMware vCenter Server Appliance (vCSA)2|
|Microsoft Windows Server 2016 (64-bit)||StorMagic SvSAN Witness Appliance|
|Microsoft Hyper-V Server 2016 (64-bit)|
1On Raspberry Pi 1, 2 and 3
2VMware vSphere 5.5 and higher
NOTE: The remote witness should be installed onto a server separate from the SvSAN VSA.
StorMagic SvSAN is licensed based on usable VSA storage capacity.
SvSAN licenses are:
- Available for 2TB, 6TB, 12TB & Unlimited usable storage capacities.
- Available in either Standard or Advanced edition (see features table opposite).
- Perpetual – one single payment and the licenses are yours forever. Only renew your Maintenance & Support when required.
- Pricing is based on a 2 node license bundle, with one license key per server (single licenses also available)
For SvSAN license pricing please contact email@example.com.
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.
During the trial period, evaluators will receive support and assistance with the first installation and a product demonstration.
Standard and Advanced
SvSAN is available in Standard or Advanced Edition. The features included in each are below:
|Synchronous mirroring/high availability|
|Stretched/metro cluster support|
|VSA restore (VMware only)|
|VMware vSphere Storage API (VAAI) support|
|Centralized monitoring and management|
|Remote shared witness|
|I/O performance statistics|
|Multiple VSA GUI deployment and upgrade|
|PowerShell script generation|
|Write back caching (SSD)|
|Predictive read ahead caching (SSD and memory)|
SvSAN Maintenance & Support
SvSAN Maintenance & Support provides organizations with access to StorMagic support resources, including product updates, knowledgebase access, live-chat 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, Monday – Friday||24 hours a day2, 7 days a week|
|Length of service||1, 3 or 5 years||1, 3 or 5 years|
|Remote support / WebEx||Yes||Yes|
|Maximum number of support administrators per contract||2||4|
|Target response times|
|– Low||12 business hours||8 business hours|
|– Medium||8 business hours||4 business hours|
|– Critical||4 business hours||1 hour (24/7/365)|
1Gold Support is only available within the timezones of UTC -08:00 to UTC +02:00. If you fall outside of this range, you must purchase Platinum Support.
2Global, 24×7 support for critical issues
More information on SvSAN Maintenance & Support can be found at stormagic.com/resources/support.