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Re: [opensuse] Mundo real Sata-disco de II-a-disco throughput? 77MB/sec

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Subject: Re: [opensuse] Mundo real Sata-disco de II-a-disco throughput? 77MB/sec es que sobre correcto?
From: David Haller <dnh@xxxxxxxxxxxx>
Date: Mon, 26 Sep 2011 00:57:06 +0200
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Hola,

En Sol, 25 *Sep 2011, David *C. *Rankin Escribió:
>  Copiando vídeo entre dos *Seagate ST31500341CUANDO discos con *ext3
>*filesystems consigo sobre 77.8 MB/*sec. Dado son supuestos para
>ser 300 MB/*sec:
>
>  "Es el 77 MB/*sec cierra al mundo real *max tendría que esperar?"
>
>  Entiendo que el 300 MB/*sec es el 'teórico *max'
>*throughput,

Aquel 300 MB/*s es lo que el *SATA-vínculo de II puede teóricamente
transferencia. Los paseos más rápidos *max fuera de sobre 160 MB/*s (lineal
leído). Recuerda, debido a *sheer hechos físicos aquellas velocidades son sólo
logrado en el *outermost sectores del disco. La curva típica sobre
las miradas de capacidad un poco así:

-----___
        ¯¯-
dónde el *innermost la velocidad es sólo sobre medio del máximo.  También,
escribe las velocidades son normalmente más lento que velocidades leídas. Tan, dependiendo en
dónde te leído de y escribir a (y si necesidad de archivos para ser *fragmented
o puede ser leído y escrito *linearly), 77 MB/*s (media) es bastante bien.

*HTH,
-*dnh

-- 
$*max = [$un => $*b] -> [ $un <= $*b ];         ## Simon *Cozens
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A *unsubscribe, *e-correo: *opensuse+unsubscribe@xxxxxxxxxxxx
Puesto que órdenes adicionales, *e-correo: *opensuse+help@xxxxxxxxxxxx


Hello,

On Sun, 25 Sep 2011, David C. Rankin wrote:
>  Copying video between two Seagate ST31500341AS disks with ext3
>filesystems I get about 77.8 MB/sec. Given they are supposed to be
>300 MB/sec:
>
>  "Is the 77 MB/sec close to the real world max I should expect?"
>
>  I understand that the 300 MB/sec is the 'theoretical max'
>throughput,

Those 300 MB/s are what the SATA-II link can theoretically
transfer. The fastest drives max out at about 160 MB/s (linear
read). Remember, due to sheer physical facts those speeds are only
reached in the outermost sectors of the disc. The typical curve over
the capacity looks somewhat like this:

-----___
        ¯¯-
where the innermost speed is only about half of the maximum.  Also,
write speeds are usually slower than read speeds. So, depending on
where you read from and write to (and if files need to be fragmented
or can be read and written linearly), 77 MB/s (average) is quite good.

HTH,
-dnh

-- 
$max = [$a => $b] -> [ $a <= $b ];         ## Simon Cozens
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