[clue-talk] Benefits of SSDs : was new processors

[chris fedde]

On my sata attached ssd boot disk I see sequential write rates of:

dd if=/dev/zero of=/tmp/foo bs=4k count=100000
100000+0 records in
100000+0 records out
409600000 bytes (410 MB) copied, 4.76564 s, 85.9 MB/s

and read rates are:

dd of=/dev/null if=/tmp/foo bs=4k count=100000
100000+0 records in
100000+0 records out
409600000 bytes (410 MB) copied, 4.57398 s, 89.6 MB/s

On my sata II based data disk I see write rates:

dd if=/dev/zero of=foo bs=4k count=100000
100000+0 records in
100000+0 records out
409600000 bytes (410 MB) copied, 8.84794 s, 46.3 MB/s

and read rates:

dd of=/dev/null if=foo bs=4k count=100000
100000+0 records in
100000+0 records out
409600000 bytes (410 MB) copied, 7.73974 s, 52.9 MB/s

So the ssd is almost twice as fast as the 7200rpm sata II
Doing this test with count <= 10000 was much faster since the whole
file could sit in io buffers.


On Mon, Jan 4, 2010 at 2:46 PM, YES NOPE9 <yes at nope9.com> wrote:
>>
>> On Jan 4, 2010, at 12:13 PM, Nate Duehr wrote:
>>
>> Quick note: Sorry, top-posted because I'm on a webmail interface right
>> now...
>>
>> The speed difference between disk and everything else
>> (processor/RAM/video/etc) is being closed with SSD drives.  Still not
>> "100% ready for prime time" yet, looking over some of the errata on the
>> early drives, but... with a good brand name (meaning: Intel right now),
>> I'd trust one.
>>
>> (Some of the others have had some lovely bugs in firmware.  Kinda makes
>> sense, Intel's a chip manufacturer and the hard drive manufacturers are
>> learning how to do that, in a way.)
>>
>> Having seen a couple of machines with SSD's in them doing various tasks,
>> I can unequivocally state that the spinning hard disk platter for
>> anything other than mass storage, is dead.  It just doesn't know it yet.
>>
>> My next personal laptop will have an SSD for the OS's and swap, for
>> sure... and the data for whatever e-mail and PIM type client software
>> I'm using will also go on it to speed those common applications up.
>>
>> It's too big of a performance increase to ignore, from what I've seen.
>>
>> --
>>  Nate Duehr
>>  nate at natetech.com
>
>
> What kind of performance gains have you seen ?
> If you provide anecdotal stories  that is fine .
> What kind of data rates and latency do you get out of SSDs ?
> Gus
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