ext3和ext4文件系统的不完全比较

ext3和ext4文件系统的不完全比较:

[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