QUADStor Storage Virtualization Software


Thin Provisioning


With QUADStor Storage Virtualization, administrators create virtual LUNs (VDisk(s)) which are thin provisioned. A VDisk with a capacity up to 64 TB can be created irrespective of the available capacity in the underlying storage. As underlying storage capacity is utilized, additional capacity can be provisioned on a need basis


SAN / NAS Data Deduplication


With fast inline deduplication algorithms, duplicate data present in incoming write requests is identified and never stored. Duplicate data is eliminated on the fly with the option of byte per byte verification of duplicate data. With archival data, storage utilization can be reduced by as much as 90% and by about 40% with primary data. Read more


File-System Independent Primary Storage Data Deduplication


Data deduplication is provided at the disk layer and hence file systems created on top of the VDisk automatically support data deduplication. Data deduplication is transparent to the file system whether Ext3-4, NTFS etc.


Global Deduplication


Data are deduplicated across VDisks which basically means that duplicate data is identified from all VDisks and not just the VDisk which received write data.


Block level mirroring (Synchronous mirroring) and High availability


Support for synchronous mirroring of data between nodes with support for active-active failover


Shared Storage Clustering and High Availability (Enterprise Edition Only)


Support for clustering of nodes for high availability and active-active failover


Data Mirroring and Data Cloning


Clone virtual disks locally withing seconds and also mirror virtual disks to another machine


Data Compression


Storage utilization is reduced even further by enabling data compression. Compression rations between 1:2 and 1:4 can be achieved.


Easy of Management


Configuring storage, creating VDisks etc can be easily performed via a simple, easy to use HTML GUI. Tasks can be performed by just a few clicks.


Unified Storage


VDisks can be accessed via Fiber Channel, iSCSI or locally. Locally accessible VDisks can be used to export CIFS and NFS shares.


vStorage APIs for Array Integration / VAAI


Support for vStorage APIs for Array Integration / VAAI has is now available. VAAI together with data deduplication gives more power to the storage array and reduces load on servers and network. Read more


Windows Server 2012 failover clusters


QUADStor synchronous mirroring technology combined with Server 2012 failover clustering technology for twice the benefits - High Availability Servers with High Availability Storage


Windows Server 2012 offloaded data transfers


With ODX support copy operations are offloaded to the storage array thereby reducing network bandwith requirements and improving IO performance significantly. Combined QUADStor's support for ODX technology and QUADStor's data deduplication technology, copy operations performance is increased ten-fold.

Also see: http://www.quadstor.com/offloaded-data-transfers-odx.html


Runs on FreeBSD and Linux


QUADStor Storage Virtualization can be easily installed on FreeBSD, RHEL/CentOS, SLES and Debian



QUADStor Storage Virtualization can be setup in a matter of few minutes.


Virtual Tape Library (VTL)


What is a Virtual Tape Library ? An Introduction


Tape technology remains the most cost effective backup solution till date. With current tape technology, tape media have a lifetime of 30 years or more and therefor are the number one choice for data archival. In recent years disk based backup gained popularity due to a drop in disk prices and due a lesser need for manual intervention. The performance of disk based backup is generally consider faster and individual file restores from disk are significantly faster due to faster seek times.


A virtual tape library (VTL) is a disk based backup system which appears to the backup host as a real tape library system. Backup streams are however written to and restored from disk. The biggest advantage of a VTL over other disk based backup solutions is its seamless integration into an existing tape backup infrastructure. Backup applications, policies, licenses etc need not change due to a VTL emulating an existing tape library system.


Benefits of a Virtual Tape Library (VTL) system


Improved backup and restore times


Disk based backup offers faster backup and restore times. Sequential access of data is still maintained by VTL system by writing the backup data to disk in a sequential manner. When compared to other disk-to-disk backup (D2D) solutions, virtual tape libraries are high performance solutions with access to the virtual devices over the storage area network (SAN) while a D2D system utilizes a NAS network. QUADStor VTL devices can be accessed over iSCSI, Fiber Channel (FC) and an InfiniBand network.


Reduced tape media handling


Handling of tape media is greatly reduced, hence lesser manual intervention is required. Only data needed for archival purposes would have to be transferred to a physical tape, reducing the amount of tape media that is eventually needed.


Easy integration and Interoperability


Tape libraries and drives from leading manufacturers are emulated. From a backup application’s point of view nothing needs to change, and to it there isn’t a difference between a virtual tape and a physical tape library. The integration of the VTL solution into the backup environment is seamless and non‐disruptive.


Multiple VTL instances


Multiple VTL instances can be created and one or more VTL instances can be dedicated to a host. Each backup server would direct its backups to its own VTL instance, removing the need for tape library sharing and backup stream multiplexing. Also multiple simultaneous backup streams improve overall backup throughput.


Dynamic disk allocation


Storage is allocated to a virtual cartridges on demand removing the need for pre allocation of disk space. Additional disk storage can be configured at a later point of time to increase the available storage capacity. Additionally disk storage can be categorized into storage pools and virtual cartridges can be associated with a storage pool. For example a WORM pool can be created for virtual cartridges with WORM property enabled.


Data deduplication


The VTL extended edition supports inline data deduplication with support for backup data streams from leading backup applications. With data deduplication, store terabytes of backup data for a fraction of the storage cost.


Data compression


Data compression decreases disk capacity requirements with translates to lesser storage costs. Data can be compressed prior to storing on disk, the compression algorithm used is fast and can achieve 2:1 compression ratios.


Disaster Recovery


With the VTL extended edition replication virtual tape data to one or more remote VTL servers for disaster recovery. Auto replication to a remote server is supported for automatic disaster recovery management


Tape Import/Export


Data from a virtual tape can be easily exported to a physical tape either manually or can be triggered by backup application. Storage pool thresholds enable retention of exported virtual tape data for certain periods of time (tape caching)


QUADStor's Virtual Tape Library


QUADStor Virtual Tape Library software is a high performance VTL solution emulating tape libraries and drives from leading hardware vendors.



  • Fiber Channel (FC), iSCSI, InfiniBand and local SCSI access
  • Dynamic storage allocation
  • Data deduplication (Extended Edition Only)
  • VTL replication (Extended Edition Only)
  • T10 logical block protection (Extended Edition Only)
  • Physical tape import/export (Extended Edition Only)
  • Easy storage management with storage pools
  • Simple and intuitive browser based management



Operating System RHEL/CentOS 5.x, 6.x, Debian 6.x, 7.x, SLES 11, FreeBSD 8.x, 9.x
Number of Virtual Tape Libraries Up to 128 VTLs or standalone virtual drives per system
Number of Virtual Cartridges Up to 60000 virtual cartridges per system
Host Connectivity iSCSI, Fiber Channel (FC), InfiniBand and local SCSI access



Vendor Library Emulation
ADIC Scalar 24
  Scalar 50
  Scalar 100
  Scalar i40/80 Series
  Scalar i500
  Scalar i2000
  Scalar i6000
Quantum/ATL M1500
  PX500 Series
HP ESL9000
  ESL E-Series
  EML E-Series
  MSL 2024/4048/8096
  MSL 6000
IBM 3583 UltraScalable Library
  3584 / TS3500
Overland Storage Neo 2000/4000/8000 Series
StorageTek L-Series
L20, L40, L80,
L120, L180, L700
SL150, SL500,
SL3000, SL8500
SpectraLogic 2K/TreeFrog



Vendor Drive Emulation
HP DLT VS80, VS160
  SDLT 220, 320, 600
  Ultrium 232 (LTO-1)
  Ultrium 448, 460 (LTO-2)
  Ultrium 960 (LTO-3)
  Ultrium 1840 (LTO-4)
  Ultrium 3280 (LTO-5)
  Ultrium 6250 (LTO-6)
IBM 3580 Ultrium 1
  3580 Ultrium 2
  3580 Ultrium 3
  3580 Ultrium 4
  3580 Ultrium 5
  3580 Ultrium 6
Quantum SDLT 220 (SuperDLT I)
  SDLT 320 (SuperDLT II)
  SDLT 600
StorageTek 3580 Ultrium 5
  T9840A, T9840B, T9840C, T9840D
  T9940A, T9940B
  T10000A, T10000B, T10000C



Vendor Version Inline Deduplication Support
CA ARCServe 15.x, 16.x Yes
CommVault Simpana 9, 10 Yes
EMC NetWorker 7.x, 8.x Yes
Symantec NetBackup 6.x, 7.x Yes
HP Data Protector 7.x, 8.x Yes
Symantec BackupExec 10.x, 11d, 12.5, 2010, 2012 Yes
Data Protection Manager 2010, 2012 Yes
Quest/BakBone Netvault 7.x, 8.x, 9.x, 10.x Yes
IBM Tivoli Storage Manager 5.x, 6.x, 7.x Yes
Veeam Backup and Replication 7.x Yes