Samsung PM380 Performance
Created: 02 Aug 2012 | 1 comment
Just out of interest, on today's train journey I took a look at the read performance of my laptop's SSD,
So this is in pretty good agreement with the stated performance of this drive being that it can deliver upto 500MB/s.
As an FYI, A Windows Explorer large file copy on WIndows XP tends to read in 64K chunks which gives a throughput of about 300MB/s. Explorer on Windows 7 though tends to read large files in 1MB chunks which gives a throughput closer to 450MB/s.
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Thought it would be interesting to present the above graph a little differently.
If we first look at transfers of 512 byte blocks, the SSD has a throughput of 5MB/s. From here, as we double the block size, the drive throughput is also doubled. The dotted line represents this linear trend (ok, it is confusing that this 'linear' trendline is curved, but that's just because i've chosen a logarithmicaly scaled x-axis).
Once we start dealing with 32K block sizes, the drive throughput is approaching 50% of it's 500MB/s maximum throughput. The SSD throughput figures at this point begin to feel the force of the approaching limit, and depart from the small-block behaviour.
Below are some interesting links I found in today's musing on my laptop's performance...
http://www.mindshare.com/files/ebooks/SATA%20Storage%20Technology.pdf
http://www.lostcircuits.com/mambo/
Ian Atkin, IT Services, Oxford University, UK
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