Up until very recently Network Attach Storage
has been viewed as a mid-tier storage solution for the marketplace.
Due to the overwhelming success of these often small and easy-to-use
appliances, businesses were able to instantaneously add gigabytes
of hard disk storage to their network in minutes.
At the same time that NAS technology was being
adopted for its plug-n-play ease of use, enterprises were unable
to efficiently leverage the technology due to its one-dimensional
ability to store and serve files. Comparable storage technologies
such as Storage Area Networks (SAN) were engineered from the very
beginning to address needs concerning storage allocation, volume
sets, partitioning and backup and redundancy. As the network storage
market continues to mature however a combination of customer demand
for the price and flexibility of NAS technology, with the robust
features and redundancy of SAN are driving the market to deliver
solutions that offer the best of both worlds.
DISCSTOR/nas High Availability is a network attach
storage solution that combines complementary storage architectures
to ensure that data will be available when needed. Evolving beyond
the standard version of DISCSTOR/nas, the High Availability product
employs clustering technology to meet the availability demands of
the enterprise marketplace. DISCSTOR/nas HA is one of the most comprehensive
storage solutions on the market today, and is one of the first products
to offer the ease of use connectivity of NAS with the scalability
and feature-set of optical storage technology
|DISCSTOR/nas HA clustering technology
allows for mirrored library systems which appear on the network
as a single device
DISCSTOR/nas HA Features
DISCSTOR/nas HA employs a number of unique features
that capitalize upon the inherent advantages of hard disk and optical
storage to offer a self-backing and self-healing storage system
which consists of mirrored library systems that appear on the network
as a single device.
Redundancy & Clustering
Redundant, fault-tolerant storage is achieved
by using clustered data storage and real-time archiving to optical
storage. Clustering technology provides data security by using mirrored
member systems that appear on the network as a single device under
one IP address. Cluster members may be located either in close proximity
to one another, or may be distributed across the network for security
and logistics concerns, and are capable of real-time mirroring for
both the hard disk and optical storage components.
Real-time archiving to optical storage works as
an effective data backup method and allows for file versioning and
data rollback functionality. The traditional methods of scheduled
backups, or network snapshots, to magnetic tape leave data vulnerable
until the actual process is completed. With DISCSTOR/nas HA the
most current data file versions residing on the optical media can
quickly and easily retrieved and restored.
During normal operation the DISCSTOR/nas
HA system will monitor network health and will test the public,
and private, networks for the ability of each member of the cluster
to contact one another. In the event that a member node in the cluster
fails, the surviving member continues to accept and store information.
Once the affected member node has been repaired and brought online,
it will connect to the surviving node. The affected node will then
discover that the surviving node had previously failed, and will
wait for the acting master to replicate changed data. Because optical
storage technology is used for the archive component, the mirrored
systems can be quickly re-synchronized by copying only the data
that has been added to the surviving member to the failed member,
thus reducing recovery time.
File System Journaling
Data integrity on the hard disk drive-based storage
portion of DISCSTOR/nas HA is indexed using File System Journaling,
a process which constantly updates, and backs up, the hard disk
log files and recovers unsaved data. This feature ensures that in
the event of a system failure, the data tables, links and configurations
on the hard disk drive storage prior to the crash can be restored
quickly and easily.
UDF File System
Data is written to the optical storage portion
of the system using the UDF file system standard which was developed
to achieve consistency amongst data written to various optical mediums.
The real world application is that data written to optical media
in DISCSTOR/nas can be physically exported out of the storage device,
and read by popular storage system products on the market today,
adding a dimension of instant portability to the solution.
DISCSTOR/nas HA is easily managed using standard
browser-based utilities where configuration, storage hierarchy,
shares, user quotas and cluster management settings are available
from any Internet-accessible location.
DISCSTOR/nas HA provides redundant, clustered
storage to ensure that data will be available when needed. Unique
amongst clustered storage products on the market, DISCSTOR/nas HA
is the only product which combines the characteristics of hard disk
drive with the inherent reliability and portability of optical technology
which results in a self-backing, self-healing storage and archive