By providing native USB DDS/DAT drives there is no need for customers to purchase
additional host-bus adapters
HP's USB 2.0 implementation benefits from the built-in reliability and failure recovery
inherent in the underlying SCSI protocol
USB 2.0 has multiple levels of physical error detection and recovery which ensure reliability
on a par with SCSI and Fibre-channel interfaces.
USB 2.0 compliance certification provides thorough, ongoing reliability and quality control.
A well implemented USB network should use only USB 2.0 compliant components,
including USB 2.0 certified cables.
Sustainable performance
In HP tests it has been shown that USB 2.0 can sustain the performance of an HP DDS/DAT
drive at around 30MB/sec, a bandwidth that would sustain the HP DAT 72 drive operating
with a compression ratio of 9:1!
USB 2.0 performance provides sufficient bandwidth to support all future generations of
DDS/DAT drives specified on the DAT Manufacturers Group Roadmap
Compression
CompressionCompression
Compression
DDS uses built-in hardware compression using the 'DCLZ' data compression algorithm. Data
compression is host-selectable with the default that compression is turned on. Typical data compression
is 2:1, but actual compression depends on the type of data being compressed and can be more or less
than 2:1.
SCSI Offline Hot-Swap
SCSI Offline Hot-SwapSCSI Offline Hot-Swap
SCSI Offline Hot-Swap
Technology
TechnologyTechnology
Technology
NOTE:
NOTE:NOTE:
NOTE:
this feature is available for SCSI products. USB variants of HP DAT drives already benefit from
hot-plug capability through the USB 2.0 interface.
The HP StorageWorks DAT SCSI tape drives are available as offline hot-swap models to increase your
uptime. With these models, you never have to take down your system to replace a failed or non-
responding tape device.
The HP StorageWorks Tape Array 5300 supports "offline hot-swap" (sometimes referred to as "warm-
swap") array modules, including DAT drives. This means the drives can be removed and replaced with
the power on and the SCSI cables attached to the server. Because the array's SCSI buses are not
buffered, however, drive replacement should only take place while the SCSI bus is quiescent (no SCSI
activity from the tape drive or any other device on the same bus).
With the HP StorageWorks DAT or array modules, the server does not need to be taken offline to install
the tape drive. Simply insert the tape drive into the server's Tape Array 5300's drive bay and install or
configure the backup software.
QuickSpecs
HP StorageWorks Tape Drives
HP StorageWorks Tape DrivesHP StorageWorks Tape Drives
HP StorageWorks Tape Drives
Product Highlights
DA - 11883 Worldwide — Version 25 — August 6, 2007
Page 10
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