Striping Methods; Raid Types - HP storageworks msa1000 Installation Manual

Modular smart array
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Striping Methods

A storage array combines the capacity of several physical hard drives into one
virtual unit called a logical unit (LUN). These LUNs are presented to the
operating system as a disk device. The physical layout of an array can be one of
two configurations:
In a vertical configuration, an array uses physical drives from each storage
enclosure. In a horizontal configuration, the array uses multiple drives contained
within the same storage enclosure.
Vertical and horizontal arrays each have their advantages and disadvantages.
Vertical arrays offer ultimate fault tolerance, but at the price of capacity utilization
and performance, while horizontal arrays allow for the creation of large arrays and
offer the best combination of capacity utilization and performance.

RAID Types

RAID is an acronym for Redundant Array of Inexpensive Disks. RAID
configurations allow you to combine multiple physical drives from one or more
storage enclosures into a single logical unit. RAID configurations can provide
fault-tolerance capabilities, so that one or more drives within the RAID set can
fail without bringing the drive sub-system down.
RAID configuration options provide flexibility to configure logical units in a way
that fits your need for availability, speed, and capacity.
RAID levels include:
The RAID level you choose affects the amount of available storage capacity, and
the performance and availability of your array.
For example, if you require a fault-tolerant system for critical data, use either
RAID 1 (or RAID 1+0), RAID 5, or RAID ADG. RAID 1 (or RAID 1+0) is the
best choice for fault tolerance when I/O performance is also important. RAID 5 or
RAID ADG is the best choice when capacity utilization is also important.
MSA1000 Installation Guide
Vertical striping
Horizontal striping
RAID 0 — data striping only (no fault tolerance)
RAID 1 — drive mirroring
RAID 1+0 — data striping and drive mirroring
RAID 5 — distributed data guarding, with distributed parity data
RAID ADG — Advanced Data Guarding, with two sets of distributed parity
Installation Procedures - for all MSA1000 Deployments
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