4.4 Storage Performance Optimization
Although you can reduce the pressure on the front part of the data accessed by the cache, but many times, the system disk is still the most serious bottleneck.
And disk availability and fault tolerance are critical to the site of the most important assets of the disk.
4.4.1 mechanical hard disk vs. solid-state drive
Mechanical hard disk for sequential access
Solid state drives for random access
4.4.2 B + Tree Tree vsLSM
In order to improve data access features, the file system or database will usually sort the data storage, which requires constant when the data additions and deletions to constantly change the order. For the B + tree, that is, left and right hand operation.
4.4.3 RAID vs HDFS
4.5 Summary