6 Replies - 665 Views - Last Post: 24 June 2013 - 10:20 PM

#1 SpiderPig  Icon User is offline

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SSD random write IOPS @ 1 byte?

Posted 22 June 2013 - 03:49 PM

Hi Everyone, does an SSD with a max random write speed of 100k IOPS @ 4kb mean that the IOPS per byte is something
Like 400,000k?
Thanks :)
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#2 jjl  Icon User is offline

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Re: SSD random write IOPS @ 1 byte?

Posted 24 June 2013 - 03:45 PM

IOPS stands for Input Output Operations Per Second. The 4kb is the size of the IO data being read or written.

If you want't to know the specific read/write speeds, look at the spec. That will give you a better idea of how fast you can read from or write to the SSD.
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#3 SpiderPig  Icon User is offline

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Re: SSD random write IOPS @ 1 byte?

Posted 24 June 2013 - 05:15 PM

Thanks for the reply. What I want to do is randomly access individual bytes of data from a large file on the SSD, just curious if the IOPS at 4kb is 100, 000 per second, whether or not the IOPS per byte would be the same (100, 000 per second) or 4, 000, 000, 000 (4, 000 bytes in a kb makes me think it'll be 4, 000 times faster to write a single byte ... ) :)/>

This post has been edited by SpiderPig: 24 June 2013 - 05:17 PM

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#4 jjl  Icon User is offline

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Re: SSD random write IOPS @ 1 byte?

Posted 24 June 2013 - 07:16 PM

You cannot read individual bytes from a HHD and (I think) a SSD. All accesses are in terms of the pre defined block size, which is usually around 4KB

This post has been edited by jjl: 24 June 2013 - 07:16 PM

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#5 SpiderPig  Icon User is offline

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Re: SSD random write IOPS @ 1 byte?

Posted 24 June 2013 - 07:23 PM

Really? So I can't simply seek through a binary file and read random bytes unless I read them as group of 4kb?
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#6 jjl  Icon User is offline

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Re: SSD random write IOPS @ 1 byte?

Posted 24 June 2013 - 08:44 PM

You can read any size you want from the file; however, you won't be reading directly from disk. The operating system will buffer chunks of the file into memory.
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#7 SpiderPig  Icon User is offline

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Re: SSD random write IOPS @ 1 byte?

Posted 24 June 2013 - 10:20 PM

Okay, I understand now. Thanks for your answers. :)
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