Modular end of GST’s SafeDR™ family enables mirrored backup plus off-line copy and cascading with SLR tape technology.

The Big Picture

• Dual SLR75 and SLR140 tape drives in external enclosure.
• Capacity: SLR140 is 70GB native (140GB compressed).
• Speed: SLR140 is 21GB/hour native (43GB/hr compressed).
• Mirrored backup provides disaster recovery support.
• Added functions: off-line copy plus cascading.
• Only dual-drive SLR subsystem available.
• LCD operator panel improves backup efficiency.
• 2-level media protection with SLR75 and SLR140.
• Roadmap to SLR200 and SLR400.
• SLR range: dual-drive unit and autoloader.
• Supports LVD, HVD, and FC connections.

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The Dual SLR Tape Subsystem is part of GST’s SafeDR™ family. These tape subsystems are housed in modular enclosures. SLR75 and SLR140 tape technologies are widely used. The Dual SLR Tape Subsystem supports Mirrored Backup, a function that generates identical sets of backup cartridges so that one set can be safeguarded remotely for disaster recovery while the other set is retained onsite for faster restores; other tape functions add off-line copy and cascading capabilities. An LCD panel provides an advanced operator interface for visibility over the backup operation.

The Dual SLR Tape Subsystem can backup a wide variety of servers. They connect natively with LVD (low voltage differential), HVD (high voltage differential), and FC (Fibre Channel) interfaces.

Model Overview

GST’s Dual SLR Tape Subsystem is available in a variety of models. Each SLR technology (SLR75, SLR140) is available in two server-to-SCSI Adapter interfaces.

Low Voltage Differential (LVD). Maximum SCSI negotiation of 160MB/s; the total server-to-storage peripheral connectivity is 12 meters.

High Voltage Differential (HVD). Maximum SCSI negotiation of 40MB/s; the total server-to-storage peripheral connectivity is 25 meters.

SLR Technology

SLR (Scalable Linear Recording) tape technology has evolved through three generations to the popular versions today: SLR75 and SLR140. Native capacities for SLR75 and SLR140 are 37GB and 70GB (75GB, 140GB compressed) with speeds of 14GB/hour and 21GB/hour (28GB/hour, 43GB/hour compressed). It has a 6-generation roadmap that provides for a native capacity of 200GB per cartridge (400GB compressed) and a transfer rate of up to 115GB/hour (230GB/hour compressed).

SLR technology provides high capacity and performance, backward compatibility, reliability, scalability and the use of existing media now and in the future. Data is recorded in parallel on four tracks for SLR75 and SLR140. Data placement ensures that it can be read during a restore operation even if the media is degraded. The current generation of SLR technology is characterized by large data buffers, In-Line Compression feature and an Auto-Sense function that optimizes tape speed.

Key benefits

Improved DR – Mirrored backup capability produces simultaneous sets of identical backup cartridges with no performance penalty; this permits off-site storage of one set for better disaster recovery and a second set for on-site storage for rapid restore.

Fault-tolerant Backup and Restore – Dual-drive configurations ensure against drive failure since the second drive continues to operate, ensuring the backup is completed successfully.

Added Tape Functions – For dual-drive subsystems, key added tape functions include: dual-drive mirroring for mirrored backups, off-line copying/verifying with no processor penalty, and cascading to extend unattended backup capacity by switching from one drive to the other (doubling capacity).

Space Saver – The small dimensions and weight of the modular configurations facilitate the optimum use of datacenter space.

Media Investment Protection – Each SLR technology is backward-read compatible to earlier generations, and forward-read compatible with future generations.

Serviceability – Modularity of design permits individual drives and GST’s Dual Drive Controller to be easily replaced in building-block fashion by the user.

Key features

Stackable Enclosures – Individual modular enclosures enable each drive and the mirrored backup controller to be handled as separate building blocks; facilitates field upgrade from single to dual drives.

LCD Display Panel – Multi-function LCD Display Panel continuously displays key drive and backup job conditions.

Dual-Drive Controller – Manages mirroring, off-line copying, cascading, and the LCD Display Panel.

Convenient Drive Interface – RS232 interface for updating firmware and optimizing drive performance.

Service and Support – A variety of support programs provide installation and onsite service; includes GST’s Accelerated Ship Program (GASP) to get replacement units on the scene rapidly.

Warranty – Purchase price includes a built-in manufacturer’s warranty of three years.

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