2013/7/17 Liu Yuan <namei.unix at gmail.com>: > may you try it on you host too？oflag=sync is always slow. try oflag=direct > instead Right, it was directsync...thank you. root at backup:/mnt/backup# dd if=/dev/zero of=c3 bs=1M count=1024 oflag=direct 536870912 byte (537 MB) copiati, 6,81561 s, 78,8 MB/s root at backup:/mnt/backup# dd if=/dev/zero of=c3 bs=1M count=1024 oflag=direct 1073741824 byte (1,1 GB) copiati, 10,9185 s, 98,3 MB/s root at backup:/mnt/backup# dd if=/dev/zero of=c4 bs=1M count=2048 oflag=direct 2147483648 byte (2,1 GB) copiati, 35,2077 s, 61,0 MB/s root at backup:/mnt/backup# sync root at backup:/mnt/backup# dd if=/dev/zero of=c5 bs=1M count=4096 oflag=direct 4294967296 byte (4,3 GB) copiati, 78,7128 s, 54,6 MB/s root at backup:/mnt/backup# sync root at backup:/mnt/backup# dd if=/dev/zero of=c6 bs=1M count=6144 oflag=direct 6442450944 byte (6,4 GB) copiati, 115,853 s, 55,6 MB/s What do you think about this data? |