IBM DS8900F User Manual

The derived values are averaged over a 5-minute period. For more information about energy-related
commands, see the commands reference.
You can also query power usage and data usage with the showsu command. For more information,
see the showsu description in the Command-Line Interface User's Guide.
National Institute of Standards and Technology (NIST) SP 800-131A security enablement
NIST SP 800-131A requires the use of cryptographic algorithms that have security strengths of 112
bits to provide data security and data integrity for secure data that is created in the cryptoperiod
starting in 2014. The DS8900F is enabled for NIST SP 800-131A. Conformance with NIST SP
800-131A depends on the use of appropriate prerequisite management software versions and
appropriate conguration of the DS8900F and other network-related entities.
Storage pool striping (rotate capacity)
Storage pool striping is supported on the DS8000 series, providing improved performance. The
storage pool striping function stripes new volumes across all arrays in a pool. The striped volume
layout reduces workload skew in the system without requiring manual tuning by a storage
administrator. This approach can increase performance with minimal operator effort. With storage
pool striping support, the system automatically performs close to highest efciency, which requires
little or no administration. The effectiveness of performance management tools is also enhanced
because imbalances tend to occur as isolated problems. When performance administration is
required, it is applied more precisely.
You can congure and manage storage pool striping by using the DS8000 Storage Management GUI,
DS CLI, and DS Open API. The rotate capacity allocation method (also referred to as rotate volumes)
is an alternative allocation method that tends to prefer volumes that are allocated to a single
managed array, and is not recommended. The rotate extents option (storage pool striping) is designed
to provide the best performance by striping volumes across arrays in the pool. Existing volumes can
be recongured nondisruptively by using manual volume migration and volume rebalance.
The storage pool striping function is provided with the DS8000 series at no additional charge.
Performance statistics
You can use usage statistics to monitor your I/O activity. For example, you can monitor how busy the
I/O ports are and use that data to help manage your SAN. For more information, see documentation
about performance monitoring in the DS8000 Storage Management GUI.
Sign-on support that uses Lightweight Directory Access Protocol (LDAP)
The DS8000 system provides support for both unied sign-on functions (available through the
DS8000 Storage Management GUI), and the ability to specify an existing Lightweight Directory Access
Protocol (LDAP) server. The LDAP server can have existing users and user groups that can be used for
authentication on the DS8000 system.
Setting up unied sign-on support for the DS8000 system is achieved by using IBM Copy Services
Manager or IBM Spectrum Control.
Note: Other supported user directory servers include IBM Directory Server and Microsoft Active
Directory.
Easy Tier
Easy Tier is designed to determine the appropriate tier of storage based on data access requirements
and then automatically and nondisruptively move data, at the subvolume or sub-LUN level, to the
appropriate tier on the DS8000 system. Easy Tier is an optional feature that offers enhanced
capabilities through features such as auto-rebalancing, hot spot management, rank depopulation, and
manual volume migration.
Easy Tier enables the DS8900F system to automatically balance I/O access to drives to avoid hot
spots on arrays. Easy Tier can place data in the storage tier that best suits the access frequency of the
data. Highly accessed data can be moved nondisruptively to a higher tier, and likewise cooler data is
moved to a lower tier.
Easy Tier also can benet homogeneous drive pools because it can move data away from over-utilized
arrays to under-utilized arrays to eliminate hot spots and peaks in drive response times.
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IBM DS8900F: DS8900F Introduction and Planning Guide

IBM DS8900F Specifications

General

Brand	IBM
Model	DS8900F
Category	Storage
Language	English