Do a bunch of benchmarking and update ceph-benchmarking section

content/ceph-benchmarking/fio_randwrite.ini

@@ -0,0 +1,40 @@
+[global]
+ioengine=libaio
+direct=1
+size=4G
+numjobs=1
+runtime=60s
+time_based
+startdelay=5s
+group_reporting
+stonewall
+
+name=randwrite
+rw=randwrite
+filename=bench
+
+[1io_4k]
+iodepth=1
+bs=4k
+[1io_8k]
+iodepth=1
+bs=8k
+[1io_64k]
+iodepth=1
+bs=64k
+[1io_4M]
+iodepth=1
+bs=4M
+
+[32io_4k]
+iodepth=32
+bs=4k
+[32io_8k]
+iodepth=32
+bs=8k
+[32io_64k]
+iodepth=32
+bs=64k
+[32io_4M]
+iodepth=32
+bs=4M