•MaxAdpat Feature Set
-Rotational Vibration Compensation (RVC)
-Adaptive Bias Estimation (ABE)
-Virtual Cache Line (VCL)
-Adaptive Active Filtration (AAF)
•Advanced Ultra160 SCSI-LVD, Ultra320 SCSI-LVD, Ultra2-LVD, and Ultra-SE with 68-pin wide connector or 80-pin SCA-2 connector
•Superior data integrity:
•352-bit Reed-Solomon quad-burst ECC provides fast on-the-fly correction for small errors and robust software-based correction for larger errors
•EDC internal protection from SCSI bus to media
Note: 1The drives are in compliance with the SCSI-3 draft proposed ANSI standards as they exist at the time of product release; SCSI-3 features may not be enabled on drives when shipped.
Many of these features are described in this chapter.
The drive contains a large, segmented buffer in RAM that is used to maximize the throughput for sequential read streams. This cache is organized as a number of separate segments.
The buffer is also used to combine or coalesce I/O data on a track-by-track basis, prior to accessing the disk media. Performance is greatly improved by gathering and combining the data on a track basis rather than on a command basis. With this unique system, multiple commands for a particular track are coalesced in the buffer before accessing the media.
As a result, multiple I/O commands, that address a single track are logically combined to avoid multiple disk accesses on multiple rotations. Since most reads and writes are sequential, this greatly increases throughput for most applications.
6.2WRITE-BACK CACHING
The drive supports write-back caching. In this case, writes are considered complete when the data is loaded into the cache, before it is written to the media. This allows the host to go on to other tasks, while the drive assumes responsibility for the data and ensuring that it is written to media as soon as possible. If write-back caching is employed, it is recommended that an uninterruptible power source (UPS) be provided for optimal data security.
