Ch 3: Installing Optional Devices

Disk Array

What is a disk array?

“Disk array” refers to the use of two or more hard disks concatenated into one logical disk. It is also called Redundant Arrays of Inexpensive Disks (RAID).

Disk array has two main advantages:

Increasing I/O performance

By dividing data into several units and distributing them to hard disks within an array (called “data striping”), I/O performance as the entire array is better than the I/O performance obtained when each disk is separately used.

Restoring data

Creation of an array parity enables you to restore data even if one of the hard disks within the array should fail, thereby preventing data from being lost.

Even if you use disk arrays, you cannot prevent data loss due to non-hard-disk failures, software crash, or incorrect manipulation. Make sure you create backup copies for system data in case of unexpected failures.

Types of Disk Arrays

Disk arrays are classified into six types (0 to 5) according to the RAID level. Of the six types, only RAID0, RAID1, RAID3, and RAID5 are currently usable. The method and features of each RAID level are shown below.

NOTE: Hitachi PC VisionBase 8450H/R Server supports RAID0, RAID1, and RAID5 as well as RAID7, which is used to install hard disks (used discretely) in the disk array controller.

RAID0

Data is striped extending over several hard disks.

 

Advantage:

Throughput increases, especially for large-volume files.

 

 

 

 

 

 

Disadvantage:

No array parity is created; therefore, if at least one of the hard disks within the array fails, all data will be lost.

 

 

 

 

 

 

 

 

 

Number of hard disks required: 2 (min.) to 6 (max.)

Hitachi PC VisionBase 8450H/R Server

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Hitachi 8450H/R manual What is a disk array?, Types of Disk Arrays

8450H/R specifications

The Hitachi 8450H/R is a powerful and versatile machine designed for heavy construction and earth-moving tasks. Renowned for its robust design and high performance, it serves as a reliable partner in various industries, including mining, construction, and infrastructure development.

One of the standout features of the Hitachi 8450H/R is its exceptional hydraulic system. This machine is equipped with a highly efficient hydraulic pump and advanced control systems that provide superior lifting and digging capabilities. The hydraulic system not only enhances operational efficiency but also ensures smooth and precise movements, which is critical when working in tight spaces or on uneven terrain.

In terms of engine performance, the Hitachi 8450H/R is powered by a reliable and fuel-efficient engine that offers impressive output while minimizing emissions. This not only helps operators save on fuel costs but also aligns with environmental regulations and sustainability goals. The engine is designed to provide optimal torque and power at various operating speeds, allowing for versatile applications.

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The machine's undercarriage is built for durability, equipped with heavy-duty tracks that ensure stability and traction on various ground conditions. This feature is particularly beneficial in challenging terrains where other machines might struggle. The suspension system further enhances ride comfort, allowing for smooth operation even on rough surfaces.

In addition to its robust build and high performance, the Hitachi 8450H/R is designed for easy maintenance. Key components are accessible, and the machine comes with advanced diagnostic systems that help operators identify potential issues before they escalate. This design philosophy not only reduces downtime but also extends the lifespan of the equipment.

Overall, the Hitachi 8450H/R combines advanced technologies, exceptional performance, and user-friendly features to deliver outstanding results in heavy-duty applications. Its blend of power, durability, and ease of operation makes it a top choice for construction and earth-moving professionals around the globe.