SAS-6GBits (Serial Attached SCSI) technology overview
SAS-6GBits (Serial Attached SCSI) is a technology used in modern hard disk drives that provides high-speed data transfer rates and enhanced reliability. It is a standard for connecting computer storage devices, such as hard disk drives and solid-state drives, to the rest of the system.
SAS-6GBits is the latest version of the SAS technology, providing a data transfer rate of 6 gigabits per second (Gbps), which is twice as fast as the previous version, SAS-3GBits. This increased data transfer rate allows for faster access to data stored on the hard disk drive.
In addition to speed, SAS-6GBits also offers several other benefits, including improved reliability and data integrity. It features advanced error-correction capabilities and supports hot-plugging, which allows for the replacement of failed drives without having to power down the entire system.
SAS-6GBits also supports a variety of RAID configurations, which provide redundancy and data protection by mirroring data across multiple drives.
RAID (Redundant Array of Independent Disks) support and benefits
RAID (Redundant Array of Independent Disks) is a technology that allows multiple hard disk drives to be combined into a single logical unit. RAID provides increased data reliability, fault tolerance, and performance, and is commonly used in server and storage systems.
RAID works by storing data across multiple hard drives, which provides redundancy and protects against data loss in the event of a hard drive failure. There are several different RAID configurations, each with its own advantages and disadvantages:
- RAID 0 - Provides improved performance by striping data across two or more hard drives, but offers no data redundancy.
- RAID 1 - Provides data redundancy by mirroring data across two hard drives, but does not improve performance.
- RAID 5 - Provides both data redundancy and improved performance by striping data across multiple hard drives and using parity information to protect against data loss.
- RAID 6 - Similar to RAID 5, but with an additional level of redundancy to protect against the failure of two hard drives.
- RAID 10 - Combines the benefits of RAID 1 and RAID 0 by mirroring data across multiple sets of striped hard drives.
MTBF (Mean Time Between Failure) and error correction features
MTBF (Mean Time Between Failure) is the average number of hours that a product or system can function without failure. Error correction systems are designed to identify, detect, and correct errors in a system, improving system reliability and performance.
Error correction features can be implemented using various coding techniques, such as Hamming codes, CRC codes, and BCH codes. These codes are used to detect, identify, and correct errors in a system. Hamming code, for example, is a type of error-correcting code that adds a number of parity bits to a word before sending it. These parity bits help to detect, identify, and correct errors that occur during transmission.
CRC codes are used to check for errors by calculating a checksum for the data being sent. A checksum is a number derived from the data that can be used to detect errors. BCH codes are also used to detect and correct errors. These codes use polynomial equations to detect errors and then correct them.
In conclusion, MTBF measures the average number of hours a system can function without failure, while error correction systems are used to detect, identify, and correct errors in a system. Error correction features can be implemented using various coding techniques such as Hamming codes, CRC codes, and BCH codes.
- Manufacturer : Hp-Compaq
- Manufacturer Part Number : 625271-001
- Manufacturer Website Address : www.hp.com
- Brand Name : HP
- Product Name : Hard Drive.
- Product Type : Hard Drive
- Product Model: 625271-001
- Storage Capacity : 300GB
- Rotational Speed : 10000 RPM
- Hard Drive Interface: Serial Attched SCSI (SAS)6GBITS
- "Times New Roman";mso-ansi-language:EN-US;mso-fareast-language:EN-US;
- mso-bidi-language:AR-SA">Drive Dimensions : 2.5 Inch
About Refurbished Products
Serial attached SCSI SAS 3gbps hard drives are commonly used in servers and bring with them immense benefits. However, choosing the right hard drive is very important depending on your projects. Avoid putting greater emphasis on the pricing of the hard drives, since it may lead to a complete disaster.
The preserve of the SAS 3Gbps HDD is in servers and high-end workstations where speed considerations are most important. The hard drives are available as 3.5-inch form factor and 2.5-inch form factor depending on your specific applications. These HDDs will process data and complete reads/writes faster than SATA drives – actually, it takes just a fraction of the time. It makes them ideal for enterprise applications since they perform efficiently, faster, and under rigorous conditions. The faster throughput is the idea behind getting SAS hard drives for your applications, seeing that the latest SAS 12Gbps hard disks are super-fast and incorporate RAID hardware controllers.
The throughput of a SAS 3Gbps disk drive is rated at 300 MB/s. Bandwidth typically represents the theoretical maximum level of data that passes through a channel. On the other hand, throughput is the actual measure of how much data actually travels through the channel successfully. Therefore, bandwidth is a theoretical value whereas throughout is the real value.
The key features and capabilities of the popular SAS 3Gbps HDDs are:
- Performance – You will benefit from performance levels that reach 3Gbps (300MB/s throughout), full-duplex transmissions, wide ports for aggregated bandwidth, advanced command queuing, and port aggregation.
- Flexibility – the flexibility of the SAS 3Gbps lies in physical and software compatibility on SATA drives as well as backward-compatibility with SCSI software.
- Scalability – you cannot go wrong with the broad address range allowing connection to physical devices and external storage systems using the long cables and small connectors.
- Reliability and availability – you can achieve point-to-point connections, redundancy paths, and dual active port support with the SAS 3Gbps drives.
We have recommended the SAS 3Gbps to a good number of clients since they are best suited for 24/7 workloads. These hard drives are best suited for servers due to the 100% duty cycle. SAS hot-swap hard drives will always win on the reliability front since they are designed to read/write data throughout the day. The SAS 3Gbps HDD cannot be compared to SATA drives commonly used for desktops that have 20-30% duty cycles. Drive speed is a major determinant of throughput and is measured in RPMs whereby SAS drives will operate at between 7200 and 15000 RPM. For better understanding, the faster a drive rotates, the higher the read/write speeds and the higher the throughput. The net effect will apply for slower drive speeds which negatively impact read/write speed and throughput.
The only downside with the SAS 3Gbps hard drives is the storage capacities available. Generally, SAS hard drive disks have a smaller storage capacity format compared to SATA drives. The common storage sizes available for SAS 3Gbps drives include: 73GB-10K RPM, 146GB-15K RPM, 300GB-15000 RPM, 450GB-15K RPM, 600GB-10K RPM, 1TB1TB-7.2K RPM, and 2TB-7.2K RPM which are ideal for servers and high-end machines used for production content.
SAS cables are required for connection and feature a continuous connector for both power and data. The SAS cable cannot be used to connect SATA controllers using a SATA connector since they carry higher power voltages. A distinctive feature of the SAS cables is that they are more than 30-feet in length compared to SATA cables that can only reach a maximum of 3-feet in length. However, it is possible to connect a SAS drive to a SATA controller using a continuous/SAS connector.
We have different specifications of the SAS 3Gbps hard drive which are ideal for high-performance applications and for highly virtualized environments that typically handle critical applications and high volumes of users.
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What is the Manufacturer/Brand Warranty?
In general, a manufacturer's warranty service/support is a written guarantee to the buyer of a product. Its terms assure the replacement or repair of the product, if necessary, within a specified period after the purchase (2-5 years depending on the brand/manufacturer). It is typically included in the price of the product. Products are brand new and sealed and the original manufacturer box is complete with the Manufacturer's genuine warranty. For most of the brand new/retail products that come with the manual and box, exceptions may apply (i.e., Cisco, Juniper Networks).
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