Understanding performance anomalies of SSDs and their impact in enterprise application environment
Jian Hua Hu, Hong Jiang, Prakash Manden · 2012
SSD is known to have the erase-before-write and out-of-place update properties. When the number of invalidated pages is more than a given threshold, a process referred to as garbage collection (GC) is triggered to erase blocks after valid pages in these blocks are copied somewhere else. GC degrades both the performance and lifetime of SSD significantly because of the read-write-erase operation sequence.