SAS device

Any device that conforms to the SAS standard and is attached to the

 

SAS bus by a SAS cable. This includes SAS storage adapters

 

(host adapters) and SAS peripherals.

SATA

Acronym for Serial Advanced Technology Attachment. A physical storage

 

interface standard, SATA is a serial link that provides point-to-point

 

connections between devices. The thinner serial cables allow for better

 

airflow within the system and permit smaller chassis designs.

SMP

Acronym for Serial Management Protocol. SMP enables communicates

 

topology management information directly with an attached SAS

 

expander device. Each PHY on the controller can function as an SMP

 

initiator.

SSP

Acronym for Serial SCSI Protocol. SSP enables communication with

 

other SAS devices. Each PHY on the SAS controller can function as an

 

SSP initiator or SSP target.

STP

Acronym for Serial Tunneling Protocol. STP enables communication with

 

a SATA II device through an attached expander. Each PHY on the SAS

 

controller can function as an STP initiator.

stripe size

The total disk space consumed by a stripe not including a parity disk. For

 

example, consider a stripe that contains 64 Kbytes of disk space and has

 

16 Kbytes of data residing on each disk in the stripe. In this case, the

 

stripe size is 64 Kbytes and the stripe element size is 16 Kbytes. The

 

stripe depth is four (four physical disks in the stripe). You can specify

 

stripe sizes of 8 Kbytes, 16 Kbytes, 32 Kbytes, 64 Kbytes, or 128 Kbytes

 

for each virtual disk. A larger stripe size produces improved read

 

performance, especially if most of the reads are sequential. For mostly

 

random reads, select a smaller stripe size.

striping

Disk striping writes data across two or more disks. Each stripe spans two

 

or more disks but consumes only a portion of each disk. Each disk,

 

therefore, may have several stripes. The amount of space consumed by

 

a stripe is the same on each disk included in the stripe. The portion of

 

a stripe that resides on a single disk is a stripe element. Striping by itself

 

does not provide data redundancy; striping in combination with parity

 

provides data redundancy.

A-4

Glossary of Terms and Abbreviations

 

Copyright © 2006-2007 by LSI Corporation. All rights reserved.

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IBM MegaRAID 8480 manual SAS device, Stripe size, Striping
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MegaRAID 8480 specifications

The IBM MegaRAID 8480 is a high-performance RAID (Redundant Array of Independent Disks) controller designed for enterprise-class storage environments. It delivers advanced data protection, high availability, and exceptional scalability, making it an ideal choice for businesses that require robust data management solutions.

One of the main features of the IBM MegaRAID 8480 is its support for both SAS (Serial Attached SCSI) and SATA (Serial ATA) drives, providing flexibility in storage configurations. This controller supports up to 128 devices, allowing organizations to build large, efficient storage arrays that can accommodate extensive data needs.

The MegaRAID 8480 utilizes advanced RAID levels, including RAID 0, 1, 5, 6, 10, 50, and 60, enabling users to select the level of data redundancy and performance that best fits their specific requirements. The controller also supports online capacity expansion and RAID level migration, ensuring that users can seamlessly adapt their storage configurations as their business evolves.

In terms of performance, the MegaRAID 8480 is equipped with 8GB of DDR4 cache memory, which significantly enhances data access speeds and provides improved I/O performance. With the ability to process a large number of transactions simultaneously, this controller is well-suited for demanding enterprise applications, such as database management systems and virtualized environments.

To further enhance data protection, the MegaRAID 8480 features battery-backed write cache technology. This ensures that data in the cache is not lost in the event of a power failure, safeguarding critical information. Furthermore, the MegaRAID SafeStore technology offers additional protection through encryption-key management, which helps safeguard sensitive data from unauthorized access.

Another notable characteristic is the intuitive management interface provided by the MegaRAID Storage Manager software. This tool streamlines storage monitoring and enables users to easily manage their RAID configurations. Additionally, the controller supports advanced diagnostic features that assist administrators in identifying and resolving potential issues before they escalate.

The IBM MegaRAID 8480 is designed for the modern data-driven enterprise, combining performance, reliability, and scalability into a comprehensive storage solution. With its robust set of features and cutting-edge technology, it empowers organizations to enhance their data management strategies while ensuring that their critical applications remain available and secure. This makes the MegaRAID 8480 a standout choice for businesses seeking to future-proof their storage infrastructure.
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