FusionIO card speed difference

/dev/md0 (RAID1 FusionIO, 320GB drive)

/dev/sda3 (Dell R910 local SAS drive)

Read performance:

# dd iflag=direct if=/dev/md0 of=/dev/null bs=1M count=10000

10000+0 records in

10000+0 records out

10485760000 bytes (10 GB) copied, 16.389 seconds, 640 MB/s

# dd iflag=direct if=/dev/sda3 of=/dev/null bs=1M count=10000

10000+0 records in

10000+0 records out

10485760000 bytes (10 GB) copied, 76.8867 seconds, 136 MB/s

# echo “scale=3;640/136″|bc -l

4.705

Write performance:

# dd if=/dev/zero of=/FusionMount/wuhai.txt bs=1M count=1000 conv=fdatasync
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 3.35998 seconds, 312 MB/s

# dd if=/dev/zero of=/tmp/wuhai.txt bs=1M count=1000 conv=fdatasync
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 9.21373 seconds, 114 MB/s

$ echo “scale=3;312/114″|bc -l
2.736

FusionIO cards in RAID0:

# dd iflag=direct if=/dev/md0 of=/dev/null bs=1M count=10000

10000+0 records in

10000+0 records out

10485760000 bytes (10 GB) copied, 10.1195 seconds, 1.0 GB/s

# dd if=/dev/zero of=/FusionIO/wuhai.txt bs=1M count=1000 conv=fdatasync

1000+0 records in

1000+0 records out

1048576000 bytes (1.0 GB) copied, 2.35316 seconds, 446 MB/s

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