Read/Write HDD Speed Test

These are the observations I recorded while doing some read/write speed tests on a server.  The main goal was to see the performance difference between RAID1, RAID5, and RAID10.  I also tossed in another RAID5 test with more drives.


The tests were performed with a PERC5 controller using 3 to 5 15K RPM SAS drives.  Each time, building the array and initializing the drives on the controller prior to creating a partition and formatting it ext4 in Linux.  Anyway, here are the results.


Device and Cache read tests were performed using ‘hdparm -tT’.  Write tests were performed using ‘dd if=/dev/zero of=test bs=8k count=250000 && sync’.



Device Read 72.16MB/sec Cache Read 897.15MB/sec Write 62MB/s
RAID5 (3 Drives)
Device Read 181.78MB/sec Cache Read 885.95MB/sec Write 110MB/s
RAID5 (5 Drives)
Device Read 188.76MB/sec Cache Read 901.91MB/sec Write 111MB/s
RAID10 (4 Drives)
Device Read 162.48MB/sec Cache Read 887.93MB/sec Write 136MB/s


So the RAID10 had the fasted write performance at 136MB/s and the RAID5 with 5 drives had the fasted device read performance at 188.76MB/sec and cache read performance at 901.91.

Other random stuff.

Single 7200RPM 1TB drive
iSCSI drive on VMWare
Device Read 42.74MB/sec Cache Read 5,531.82MB/sec Write 11.1MB/s
Hardware RAID0
on local storage of VMWare
Device Read 228.06MB/sec Cache Read 5,668.57MB/sec Write 30.1MB/s
Single drive on local storage of VMWare
Device Read 105.89MB/sec Cache Read 5,905.20MB/sec Write 24.3MB/s