Users Guide

PERC Capability CEM configuration Capable Controller
(PERC 9.1 or later)
CEM configuration Non-capable
Controller (PERC 9.0 and lower)
Real-time
NOTE: For the 14th generation of
PowerEdge servers, PERC 9 and
PERC 10 controllers are supported.
If there is no existing pending or scheduled
jobs for the controller, then configuration is
applied.
If there are pending or scheduled jobs for
that controller, then the jobs have to be
cleared or you must wait for the jobs to be
completed before applying the configuration
at run-time. Run-time or real-time means, a
reboot is not required.
Configuration is applied. An error message is
displayed. Job creation is not successful and
you cannot create real-time jobs using Web
interface.
Staged If all the set operations are staged, the
configuration is staged and applied after
reboot or it is applied at real-time.
Configuration is applied after reboot
Topics:
• Understanding RAID concepts
• Supported controllers
• Supported enclosures
• Summary of supported features for storage devices
• Inventorying and monitoring storage devices
• Viewing storage device topology
• Managing physical disks
• Managing virtual disks
• Managing controllers
• Managing PCIe SSDs
• Managing enclosures or backplanes
• Choosing operation mode to apply settings
• Viewing and applying pending operations
• Storage devices — apply operation scenarios
• Blinking or unblinking component LEDs
Understanding RAID concepts
Storage Management uses the Redundant Array of Independent Disks (RAID) technology to provide Storage Management capability.
Understanding Storage Management requires an understanding of RAID concepts, as well as some familiarity with how the RAID
controllers and operating system view disk space on your system.
What is RAID
RAID is a technology for managing the storage of data on the physical disks that reside or are attached to the system. A key aspect of
RAID is the ability to span physical disks so that the combined storage capacity of multiple physical disks can be treated as a single,
extended disk space. Another key aspect of RAID is the ability to maintain redundant data which can be used to restore data in the event
of a disk failure. RAID uses different techniques, such as striping, mirroring, and parity, to store and reconstruct data. There are different
RAID levels that use different methods for storing and reconstructing data. The RAID levels have different characteristics in terms of
read/write performance, data protection, and storage capacity. Not all RAID levels maintain redundant data, which means for some RAID
levels lost data cannot be restored. The RAID level you choose depends on whether your priority is performance, protection, or storage
capacity.
NOTE:
The RAID Advisory Board (RAB) defines the specifications used to implement RAID. Although RAB defines the
RAID levels, commercial implementation of RAID levels by different vendors may vary from the actual RAID
specifications. An implementation of a particular vendor may affect the read and write performance and the degree of
data redundancy.
184 Managing storage devices