ext3和ext4的不完全比较 - System - 系统※网络技术实验室

[root@AS5 lvm]# time dd if=/dev/zero of=/backup/dd_test bs=2048MB count=1
1+0 records in
1+0 records out
2048000000 bytes (2.0 GB) copied, 20.4339 seconds, 100 MB/s

real    0m20.461s
user    0m0.000s
sys     0m5.743s
[root@AS5 lvm]# time dd if=/dev/zero of=/opt/dd_test bs=2048MB count=1
1+0 records in
1+0 records out
2048000000 bytes (2.0 GB) copied, 25.0835 seconds, 81.6 MB/s

real    0m26.331s
user    0m0.000s
sys     0m5.515s

/dev/sdb1 ext4dev 68G 25G 39G 40% /backup

/dev/sda8 ext3 25G 2.2G 22G 10% /opt