IOPS & SSD Speed questions

[kristoferen 10]

Can someone tell me how IOPS work?

I can measure r/w performance with a few simple commands; is there anything similar to measure IOPS?

Could someone with an SSD drive post results to compare to mine?

:/home# dd if=/dev/zero of=tempfile bs=1M count=1024 conv=fdatasync,notrunc

1024+0 records in

1024+0 records out

1073741824 bytes (1.1 GB) copied, 3.59429 s, 299 MB/s

:/home# echo 3 > /proc/sys/vm/drop_caches

:/home# dd if=tempfile of=/dev/null bs=1M count=1024

1024+0 records in

1024+0 records out

1073741824 bytes (1.1 GB) copied, 3.08678 s, 348 MB/s

:/home# dd if=tempfile of=/dev/null bs=1M count=1024

1024+0 records in

1024+0 records out

1073741824 bytes (1.1 GB) copied, 0.137719 s, 7.8 GB/s

:/home# hdparm -tT /dev/md2

/dev/md2:

Timing cached reads: 12290 MB in 2.00 seconds = 6148.13 MB/sec

Timing buffered disk reads: 1170 MB in 3.00 seconds = 389.55 MB/sec