[Watford] SSD performance - seek test

[Alain Williams]

Seek times:

SSD		 0.13 ms
Hard disk	15.04 ms

The hard disk seek time is ~ twice that mentioned on the spec sheet. What it
measures is the count of: seek + read; what is quoted is probably just seek.
The seeker program is probably more realisitic.

(Read of 1/2 KiB)

Using: http://www.linuxinsight.com/files/seeker.c 
                
[root at polo tmp]# ./seeker /dev/sda
Seeker v2.0, 2007-01-15, http://www.linuxinsight.com/how_fast_is_your_disk.html
Benchmarking /dev/sda [122104MB], wait 30 seconds..............................
Results: 7872 seeks/second, 0.13 ms random access time
[root at polo tmp]# ./seeker /dev/sdb
Seeker v2.0, 2007-01-15, http://www.linuxinsight.com/how_fast_is_your_disk.html
Benchmarking /dev/sdb [1907729MB], wait 30 seconds.............................
Results: 66 seeks/second, 15.04 ms random access time


Interesting: I had never thought of hard disks only doing 66 random access
operations/second. On that basis the SSD is 100 times as fast.

I might play with seeker.c to have some options to do some writes.

-- 
Alain Williams
Linux/GNU Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer.
+44 (0) 787 668 0256  http://www.phcomp.co.uk/
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