Such algorithm reconstructs the regions which users frequently visit as soon as possible to reduce the disk head movement for reducing the user response time and the reconstruction time.
该算法的核心思想是优先重建被用户频繁访问的数据区域,尽可能地减少磁头移动带来的开销以缩短用户响应时间和重建时间。
参考来源 - 磁盘阵列在线重建与RAID5扩容的设计与实现·2,447,543篇论文数据，部分数据来源于NoteExpress
现在，大多数常用的企业硬盘驱动器(HDD)都受到磁头移动速度、盘片旋转速度和查找延时的限制。
Now, the most commonly used enterprise hard disk drives (HDDs) are limited by the rate of head movement, the speed of the spinning platter, and seek latency.
磁盘盘片在无需移动磁头的前提下即可读取的所有扇区组成一个磁道。
All the sectors on a disk platter that can be read without moving the head constitute a track.
这样一来，我们避免了将任何其他数据写入驱动器，并减少了任何随机磁头的移动。
That way, we avoided having any other data written to the drive, and reduced any random head movement.
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