IO class id,IO class name,Eviction priority,Allocation
0,unclassified,22,1
1,metadata&done,0,1
11,file_size:le:4096&done,9,1
12,file_size:le:16384&done,10,1
13,file_size:le:65536&done,11,1
14,file_size:le:262144&done,12,1
15,file_size:le:1048576&done,13,1
16,file_size:le:4194304&done,14,1
17,file_size:le:16777216&done,15,1
18,file_size:le:67108864&done,16,1
19,file_size:le:268435456&done,17,1
20,file_size:le:1073741824&done,18,1
21,file_size:gt:1073741824&done,19,1
22,direct&done,20,1