| Marc de Vries 2004-07-20, 5:45 pm |
| On Mon, 19 Jul 2004 16:20:13 +0200, "Folkert Rienstra"
<see_reply-to@myweb.nl> wrote:
>"Benno" <0@0.invalid> wrote in message news:40fb75f1$0$284$4d4ebb8e@news.nl.uu.net
>
>512 bytes (one sector) or 4 kB (one cluster) reside in a single 64kB
>stripe so it transfers at single drive speed.
>
>At an STR of 51MB/s this file transfers in .1 ms or .4 ms
>
>With an average access time of 12 ms your average transfer rate is from
>(.1/12.1)*51MB/s 420kB/s to 1.65MB/s (.4/12.4)*51MB/s
>
>Your 350 byte file may run at 350/4096*1.65 MB/s = 400KB/s.
>(And yes, because of that huge difference in access time and actual trans-
>fer time it is trivial whether the disk system reads a sector or a cluster).
So you have finally accepted what I have been telling you for weeks:
that the transferrate of the array is not important for small files
because the access time is soo much bigger. 12 ms vs 0.4 ms.
I glad that you are aparantly capable of listening and learning after
all.
Marc
|