[root@gqas015 gluster-mount]# dd if=/dev/zero of=./my-file2 bs=1024k count=1000 conv=sync
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 3.91386 s, 268 MB/s
[root@gqas015 gluster-mount]# echo 3 > /proc/sys/vm/drop_caches
[root@gqas015 gluster-mount]# dd if=./my-file2 of=/dev/null bs=1024k
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 1.55056 s, 676 MB/s