Because there are 8 bits in a byte, a 100 MBps transfer rate is equivalent to an 800 Mbps transfer rate. However, most Ultra320 SCSI drives perform better and are better at multiuser read/write operations, too.ĭon’t confuse MBps and Mbps. With an average seek time of 8.5 msec and an MTTF of 1 million hours, the drive performs comparably to other 7,200 RPM SATA II drives. The Seagate Barracuda 7200 SATA II drive has a rotational speed of 7,200 RPM and an average sustained transfer rate of 58 MBps. The average sustained transfer rate is the most important factor. Sometimes you’ll see a maximum external transfer rate (per the specification to which the drive complies) and an average sustained transfer rate. A rate of 1.5 Gbps is equivalent to a data rate of 187.5 MBps, and 3.0 Gbps is equivalent to 375 MBps. Transfer rates can also be expressed in gigabits per second (Gbps). The Seagate Cheetah 15K.4 has a maximum sustained data transfer rate of up to 96 MBps. For example, the Maxtor Atlas 15K II has a maximum sustained data transfer rate of up to 98 megabytes per second (MBps). For example, if you compare Ultra320 SCSI drives with 15,000 RPM rotational speed from different vendors, you will probably find similar transfer rates and MTTF. Most drives of comparable quality have similar transfer rates and MTTF. Nonoperational temperatures Measurements of the temperatures at which the drive fails Mean time to failure (MTTF) A measurement of how many hours of operation you can expect to get from the drive before it fails Maximum sustained data transfer rate A measurement of how much data the drive can continuously transfer Other factors to consider include the following: A drive with a seek time of 3.5 msec gives you a 25–30 percent response time improvement over a drive with a seek time of 4.7 msec. As an example, a drive with a rotational speed of 15,000 RPM gives you 45–50 percent more I/O per second than the average 10,000 RPM drive, all other things being equal.
Generally speaking, when comparing drives that conform to the same specification, such as Ultra320 SCSI or SATA II, the higher the rotational speed (measured in thousands of rotations per minute) and the lower the average seek time (measured in milliseconds, or msecs), the better. Rotational speed A measurement of how fast the disk spinsĪverage seek time A measurement of how long it takes to seek between disk tracks during sequential input/output (I/O) operations You should consider not only the capacity of the drive but also the following: There really is a substantial difference in speed and performance among various drive specifications. Start by choosing drives or storage systems that provide the appropriate level of performance. When setting up a new server, you should give considerable thought to the drive configuration. SCSI drives use SCSI controllers, PATA drives use PATA controllers, and so on. This interface is used to communicate with a drive controller. The terms SCSI, PATA, and SATA designate the interface type used by the hard disk drives.
#Netdrive 2 initialize serial
Many drive types are available for use with Windows Server 2008 R2, including Small Computer System Interface (SCSI), Parallel ATA (PATA), and Serial ATA (SATA). Typical drives have capacities of 500 gigabytes (GB) to 2 terabytes (TB). The amount of data a drive can store depends on its size and whether it uses compression. Physical drives are the actual hardware devices that are used to store data. Whether you use individual drives or drive sets, you need physical drives. Windows Server 2008 R2 supports drive sets and arrays using redundant array of independent disks (RAID) technology, which is built into the operating system. To improve reliability and performance, you might want a set of drives to work together. In that case, user data is stored on a workstation’s hard disk drive, where it can be accessed and stored locally.Īlthough storing data on a single drive is convenient, it isn’t the most reliable way to store data. For general user data stored on workstations, you might want to configure individual drives as stand-alone storage devices. The technique you choose depends primarily on the type of data you’re working with and the needs of your network environment. With Windows Server 2008 R2, you can configure hard disk drives in a variety of ways. Before you make a hard disk drive available to users, you need to configure it and consider how it will be used.
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