Posts tagged ssd

benchmarking: disc access speeds

posted on 2015-03-29 21:15:08

This here is just for the record:

[root@jerrylee /home/jl]# for i in dd home/dd; do dd if=/dev/zero of=/"$i"/test bs=1M count=1024 oflag=direct; done
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 5.63433 s, 191 MB/s
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 14.0452 s, 76.4 MB/s
[root@jerrylee /home/jl]# for i in dd home/dd; do dd if=/dev/zero of=/"$i"/test bs=1M count=1024 oflag=sync; done  
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 11.7655 s, 91.3 MB/s
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 46.4223 s, 23.1 MB/s
[root@jerrylee /home/jl]# for i in dd home/dd; do dd if=/dev/zero of=/"$i"/test bs=1M count=1024; done
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 1.83701 s, 585 MB/s
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 6.30389 s, 170 MB/s
[root@jerrylee /home/jl]# hdparm -t /dev/sda; hdparm -t /dev/sdb               

/dev/sda:
 Timing buffered disk reads: 756 MB in  3.00 seconds = 251.76 MB/sec

/dev/sdb:
 Timing buffered disk reads: 236 MB in  3.02 seconds =  78.02 MB/sec

One was an ordinary hdd, the other a ssd. I cannot be bothered to look up the model names currently.

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