Re: Effects of setting linux block device readahead size

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От Scott Marlowe
Тема Re: Effects of setting linux block device readahead size
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Msg-id dcc563d10809102237s2aa1fa09x1df9276282544342@mail.gmail.com
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Ответ на Re: Effects of setting linux block device readahead size  (James Mansion <james@mansionfamily.plus.com>)
Список pgsql-performance
On Wed, Sep 10, 2008 at 11:21 PM, James Mansion
<james@mansionfamily.plus.com> wrote:
> Greg Smith wrote:
>>
>> Average seek time:      4ms
>> Seeks/second:        250
>> Data read/seek:        1MB    (read-ahead number goes here)
>> Total read bandwidth:    250MB/s
>>
> Most spinning disks now are nearer to 100MB/s streaming.  You've talked
> yourself into twice that, random access!

The fastest cheetahs on this page hit 171MB/second:

http://www.seagate.com/www/en-us/products/servers/cheetah/

Are there any drives that have a faster sequential transfer rate out there?

Checked out hitachi's global storage site and they're fastest drive
seems just a tad slower.

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