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VersaCache as a SAN Cache
 As a SAN cache, VersaCache improves application
performance by automatically caching all blocks of data going to and from any
Fibre Channel attached storage, including RAID arrays and JBOD. Installation is
transparent - simply attach it between servers and storage and it automatically
caches all host accessed data dramatically improving application performance by
reducing access time to the storage. Its predictive caching is designed to
improve both read and write performance by increasing the chance that read data
will be in the cache when needed, and through buffered destaging of write data.
The system’s caching algorithms are built into firmware and are designed
to overcome the high overhead associated with slow read/write performance
across a large segment of data. Caching methods supported include
write-through, write-back, and read-ahead. The caching methods are user
configurable per subsystem or per LUN.
VersaCache as a File Cache
VersaCache’s high-performance, solid state
disk architecture is ideal for storing performance-demanding data and
accelerating application performance. VersaCache is able to support dozens of
servers while providing up to a 500x reduction in I/O response time when
compared with the best mechanical disks. Reduced I/O response times translate
to higher I/O rates and increased accessibility to critical data and hot
files.
 VersaCache appears as a Fibre Channel compatible
disk to the host server(s) facilitating plug-and-play installation. The unit is
compatible and interoperable with virtually every host operating system
including IBM AIX, Sun Solaris, HP-UX, Linux, Windows, and Apple OS X. It is
also fully tested and compatible with Fibre Channel host bus adapters and
switches from QLogic, Emulex, LSI Logic, Cambex, Brocade, Cisco, and
McData.
When the appropriate ‘hot’ files are placed on the
appliance, VersaCache can accelerate numerous applications across many
industries. Real-world application performance improvements of up to 25-times
can be achieved by VersaCache users when running on-line transaction processing
(OLTP), batch processing, e-mail, database, and other I/O and
bandwidth-intensive operations.
Performance
VersaCache’s state-of-the-art architecture
and DDR RAM memory are optimized for I/O intensive applications. Built for
speed, VersaCache is capable of delivering up to 400,000 I/Os per second
(IOPS).
Each VersaCache subsystem supports up to 8 high-speed 4Gb/s
Fibre Channel ports. All ports can serve data simultaneously without any
performance degradation.
RAS Features
To ensure the highest level of reliability, all
critical components within the VersaCache subsystem are redundant. In addition,
power supplies and back-up disk drives are hot-swappable.
Internal
memory used for data storage is protected by ECC memory error correction which
corrects single-bit data errors in the memory chips.
Host-based
failover software is available to provide full data availability in the event
of an HBA, cable, switch, or other storage path failure in high-availability
configurations.
Manageability
VersaCache can be monitored, managed and
configured remotely and locally via an intuitive browser interface.
Protecting your IT Investment
By accelerating application performance through
intelligent caching, VersaCache increases the useful life of existing server
and storage infrastructures.
In many instances, IT organizations have
been forced to deploy additional server and storage resources to achieve
acceptable application response times. Deploying VersaCache in a storage
network environment dramatically increases the number of simultaneous users
that can access mission-critical data without experiencing unacceptable wait
times.
In addition, customers can fully utilize their existing disk
storage capacities without application performance degradation. Striping data
over many disk drives to boost performance is no longer necessary - a method
that often left up to 50% of the disk storage capacity unused.
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