Hi, I set the following parameters in ceph.conf [client] rbd cache=true rbd cache size= 25769803776 rbd readahead disable after byte=0
map a rbd image to a rbd device then run fio testing on 4k read as the command ./fio -filename=/dev/rbd4 -direct=1 -iodepth 64 -thread -rw=read -ioengine=aio -bs=4K -size=500G -numjobs=32 -runtime=300 -group_reporting -name=mytest2 Compared the result with setting rbd cache=false and enable cache model, I did not see performance improved by librbd cache. Is my setting not right, or it is true that ceph librbd cache will not have benefit on 4k seq read? thanks.
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