v An increase in license scope is nondisruptive and takes effect
immediately. A decrease in license scope is also nondisruptive but does
not take effect until the next IML.
v Easy Tier helps keep performance optimized by periodically
redistributing data to help eliminate drive hot spots that can degrade
performance. This function helps balance I/O activity across the drives
in an existing drive tier. It can also automatically redistribute some data
to new empty drives added to a tier to help improve performance by
taking advantage of the new resources. Easy Tier does this I/O activity
rebalancing automatically without disrupting access to your data.
The following examples include activities that are disruptive:
v The installation of an earthquake resistance kit on a raised or nonraised
floor.
v The removal of an expansion frame from the base frame.
Energy reporting
You can use DS8880 to display the following energy measurements
through the DS CLI:
v Average inlet temperature in Celsius
v Total data transfer rate in MB/s
v Timestamp of the last update for values
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 DS8880
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 configuration of the DS8880 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 efficiency, 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 configure 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
24 DS8880 Introduction and Planning Guide
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