In general, storage resources are allocated to each application separately. As it is almost impossible to define
storage requirements of an application exactly in advance administrators are usually allocating too much storage
to be prepared for the worst case. But so plenty of capacity is wasted in all other case.
With the intelligent storage management of OSL Storage Cluster on behalf of global storage pools there is no excess
or wasted capacity remaining. OSL's device driver allows to create virtual volumes from different disks or LUNs.
Such a virtual volume may well consist of physically separate disks from different storage systems. But disks
can not only be put together as an assembly. It is also possible to cut any size of volume from a disk or to put
a volume together from parts of different disks (such as waste capacities).
With this concept OSL is going a step further than the well-known technology of thin provisioning. No only
virtually existing storage has to be pretended. The administrator can increase virtual volumes easily on demand.
Thanks to the waste-free allocation lavishness of expensive RAID resources is part of the past. The software is
also able to increase performance by striping disks.
Clusters are generally recognized as very suitable solutions for high availability and reliability. But they are
also known, in part because of old-fashioned software concepts of some well-known solutions, as "elitist and
complex". This is a main obstacle for small and medium business customers to use modern cluster technology.
OSL does away with this prejudice. Unlike many competetive solutions OSL Storage Cluster does not require a
redundant cluster interconnect. On behalf of centralized stored information (cluster database in RAID system) the
cluster nodes are communicating over storage network (eg FC-SAN). The transferred cluster-own data needs even with
older hardware a barely measurable bandwidth of the storage connection.
So not at least a significant reduction of complexity is achieved. By the way, OSL Storage Cluster avoids with that
concept a cluster typical problem: With conventional cluster software it is never clear if there is a real failure
of the host or only a problem of the heartbeat. With a clear command syntax, centralized administration from any
cluster node and consistent uniform device names OSL Storage Cluster stands out with ease of use rather than
Conventional cluster solutions usually rely on standby machines, which are jumping in if a productive
server quits the service. Depending on the operating condition of the secondary machine this is called
active / active or active / passive cluster. To obtain high availability, a very high price has to be
paid: One has to steadily retain current hardware, which would not be done regularly.
OSL follows also at this point a different path. With OSL Storage Cluster, you can assign a priority
to your applications. Thus, for example, productive business applications are prioritized higher, test or
QA systems even lower. If a productive server fails, the application moves to the server running the
lowest priority application. The less important application is shut down and restarts as soon as
sufficient server capacity is available again.
This intelligent application migration is supported by a resource-based self-management. The cluster
software automatically identifies by benchmark, whether the computing power of a server is sufficient for
an application or not. Optionally OSL Storage Cluster is aware to assign all applications to cluster
nodes according their cpu and memory needs automatically (resource based self management / adaptive
Please find more information about high availability under
Usually, in professional IT operations a dedicated server is used for each productive application.
But this is really no need! Finally, modern servers have become so powerful that a server is well able to
handle the load of multiple applications.
This, however, needs a powerful framework enabling different applications to work separately from
each other. Mostly, this is the task of virtual machines. But especially in business critical
fields where a lot of administrative work is done for tasks like backup, restore processes and
disaster prevention VMs have considerable weaknesses.
With the concept of Virtual Runtime Environments OSL Storage Cluster provides an interesting
alternative. Seamlessly integrated into the operating system environment, compelling solutions for
just these problems are getting possible. In addition, a full integration
with individual backup procedures is possible in almost every case. More information about this
topic can be found under
Furthermore, OSL users are getting an environment that reduces the number of objects to be
administrated compared to other technologies significantly through a consistent implementation
of cluster concepts. This reduces complexity and leads to more certainty in operation.
OSL Storage Cluster consistently implements a central administrative concept being very easy to understand.
The whole high availability environment can be managed from any cluster node. Devices and paths are named
the same regardless from which host the information is requested. The nomenclature for virtual volumes can
be freely defined. Where competing solutions come up with complicated but maybe arty browser
interfaces OSL Storage Cluster convinces with a clear command-line syntax. This provides clarity and helps
to keep a clear head in complex environments and critical situations.
OSL customers usually know the value of consistently user-friendly designed tools and their editing ability
with standard Unix tools. Those who are preferring the comfort of a curses-based configuration tools can of course
make use of its features.
Modern business management software is a great support for sales, administration and management.
Unfortunately, it is good enough to block any I/O in the SAN through huge database queries. To
handle such situations more smoothly, or better yet, prevent them completely, OSL Storage Cluster
3.1 has an integrated bandwidth control. For individual volumes or complete applications this allows
both strict and flexible load-sensitive bandwidth limitations. As a consequence, all systems always
remain manageable. Productive applications won't get disabled any longer completely.
Further, an important use case of this function exists beside I/O regulation. Bandwidth control can
restrict resource requirements of synchronization operations in mirroring environments effectively.
So even at high traffics trouble-free operation of productive applications can be secured.
Some years ago, many customers began to invest in data center concepts with disk based backups (B2D) - a
trend still continuing. In fact B2D, mostly implemented by virtual tape libraries, brings several
advantages: online backup, reduction of storage network loads and due to streaming of tapes a
material-saving and high-performance tape backup or archiving.
Nevertheless, at this point the benefits of a disk backup solution are far away from being exhausted.
Why is in case of disaster no productive access directly to a backup application image feasible? OSL has
taken this path consequently. If primary storage fails, there are ready for restart application images
available in the secondary storage. With an intelligent design of asynchronous and synchronous mirroring
of application data and log files, OSL offers a high performant backup concept without any loss of
For testing and development purposes, professional data centers quite often have to create
copies of productive applications. This usually effects considerable efforts. Regularly external
providers have to be paid for such services. OSL Storage Cluster provides comfortable functions
for this purpose. Clone applications can be created easily with a few commands. The software
automatically selects allocated volumes. A powerful toolset provides precise integration into
To be prepared for increasing capacity and performance demands, in professional IT business
it is essential to invest in new storage hardware on a regular basis. For the migration of
data from old to new systems downtimes should be scheduled. Ways to avoid downtimes are
manifold. But often this means a costly use of additional hardware or long-winded projects
with external service providers.
When using OSL's Extended Data Management (XDM), the user gets a powerful
toolset for online migration of data at no extra costs. Unlike most other solutions XDM shines consistently
with ease of use, so the administrator has no longer to be supported by external service
OSL provides individual support, either in German or English. A system engineer is assigned to each customer.
He knows both the technical staff and the environment of the customer. So support requests will be done
easily, quickly and competently in terms of customer satisfaction. The support hotline of OSL offers a
24 / 7 access. Extremely short reaction times of up to one hour are possible. The telephone
support is secured by high qualified system engineers who are able to resolve problems immediately.
For customers outside of the German language territory support is provided by authorized OSL service
partner Fujitsu Technology Solutions (Luxembourg) S.A. Fujitsu runs a hotline and provides qualified human
resources for OSL customer support.