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Chapter 1. Version 5.0

DX Storage is a hardware agnostic, high performance, massively scalable software product that is

different from anything on the market today. These release notes contain information about the new

features in DX Storage 5.0 as well as important information about using and managing DX Storage.

Release 5.0 has the following features and updates:

• DX Storage extends its high performance, massive scalability and data integrity features for public

and private clouds to a new type of objects, named objects. Designed for applications that require

symbolic names for files or objects, named objects work alongside and are completely compatible

with traditional DX Storage objects that are identified by a Universally Unique Identifier (UUID),

which are referred to as unnamed objects.

For example, you can access named objects stored in a DX Storage cluster using a URL like

http://cluster.example.com/marketing/ads/about-object-naming.m4v.

• This release adds support for multi-tenancy, which enables enterprises to host multiple

companies or departments within a public or enterprise-wide cloud. To define a new tenant,

simply add a domain container in the cluster, which gives each tenant an independent name

space and authorization lists.

Each tenant's domain organizes objects into multiple bucket containers that are each protected

with their own security realms and authorization lists. Individual objects can also have attached

authorization lists that provide full control over who has permission to view and change the object.

• All SCSP operations can be authenticated on a per-object basis using a new metadata header,

Castor-Authorization. For example, you can allow users in a security realm named

administrators to perform PUT, COPY, APPEND, or DELETE on an object but only users in a

security realm named operators can perform a GET or HEAD on an object.

For more information, see the DX Object Storage Application Guide.

• DX Storage is optimized for SCSP operations on individual objects. If SCSP operations are

performed on domains or buckets, which are centralized resources, you should not make bucket

POST or DELETE calls on the high availability code path of your client application.

Instead, Dell recommends you perform POST and DELETE on buckets using a separate

initialization or setup routine that runs less frequently.

• A new custom metadata header is supported, x-*-meta-*. See the DX Object Storage

Application Guide for more information.

• New content caching technology accelerates read access by configuring additional RAM as

cache. Frequently read objects automatically replicate to nodes closer to the geographic location

from which they are requested. This greatly reduces latency and improves throughput.

DX Storage automatically identifies high-demand objects and dynamically caches those objects.

When the demand wanes, the objects are automatically removed from cache, leaving room for

higher-demand objects that are then moved into cache.

Version 5.0

December 2010