C6:
dd if=/dev/zero of=test bs=64k count=4k oflag=dsync
4096+0 records in
4096+0 records out
268435456 bytes (268 MB) copied, 125.003 s, 2.1 MB/s
C5:
dd if=/dev/zero of=test bs=64k count=4k oflag=dsync
4096+0 records in
4096+0 records out
268435456 bytes (268 MB) copied, 8.65567 seconds, 31.0 MB/s
同样2个磁盘做的raid,差距咋大? |