With the growing scale of the computer storage systems, the likelihood of multi-disk failures happening in the storage systems has increased dramatically. Based on a thorough analysis on the fault-tolerance capability on various existing storage systems, we propose a new hierarchical, highly reliable, multi-disk fault-tolerant storage system architecture: High Availability Object Storage System (HAOSS). In the HAOSS, each object has an attribute field for reliability level, which can be set by the user according to the importance of data. Higher reliability level corresponds to better data survivability in case of multi-device failure. The HAOSS is composed of two layers: the upper-layer and the lower-layer. The upper-layer achieves the high availability by storing multiple replicas for each storage object in a set of storage devices. The individual replicas can service the I/O requests in parallel so as to obtain high performance. The lower-layer deploys RAID5, RAID6 or RAID_Blaum coding schemes to tolerate multi-disk failures. In addition, the disk utilization rate of RAID_Blaum is higher than that of multiple replicas, and it can be further improved by growing the RAID group size. These advantages come at the price of more complicated fault-tolerant coding schemes, which involve a large amount of calculation for encoding and cause an adverse impact on the I/O performance, especially on the write performance. Results from both our internal experiments and third-party independent tests have shown that HAOSS servers have better multi-disk- failure tolerance than existing similar products. In a 1000Mb Ethernet interconnection environment, with a request block size of 1024KB, the sequential read performance for a HAOSS server reaches 104MB/s, which is very close to the theoretical maximum effective bandwidth of Ethernet networks. The HAOSS offers a complete storage solution for high availability applications without the compromises that today's storage systems require in either performance or fault-tolerance.
Vertical degree of pick-up and disc is an important factor that influences reading and writing date in DVD drive. Measuring and adjusting vertical degree of pick-up and disc is a key working procedure in DVD drive manufacture. Now, measuring method in actual production is an indirect measuring, which measure parallel between spindle motor and traverse. It’s not very accuracy as there are error in pick-up assembles. The paper suggests a new method to measure vertical degree of pick-up and disc, new method measure vertical degree of pick-up and disc directly. The key of new method is measure position of laser from pick-up. A specialty optical circuit and fine CCD camera is need. The CCD camera is responsibility for collection information of laser image of pick-up and sends information to a computer. The specialty software responsibility for calculating position of laser and calculating incline angle between pick-up and disc. Because of characteristic of DVD drive manufacture, the algorithm calculating position of laser image must be design for accuracy and quickness. The paper suggests a specialty algorithm to calculating position of laser image. The algorithm is very accuracy and quickly, it can measure 0.05-degree incline angle error. The new method is helpful to automatic adjusting technique vertical degree of pick-up and disc.