On Tue Feb 14, 2012 at 05:27:43PM -0600, Stan Hoeppner wrote:
> Maybe I simply don't understand this 'magic' of the f2 and far layouts.
> If you only read the "faster half" of a spindle, does this mean writes
> go to the slower half? If that's the case, how can you read data that's
> never been written?
>
Writes go to both halves, as normal for a mirrored setup, which is why
its write performance is lower than that of a near layout array (more
head movement required). Reads will (normally) come from the faster
(outer) half of the disk though, so read performance is better. In most
cases workloads are read-heavy, so this comes out as a significant gain.
Cheers,
Robin
--
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( ' } | Robin Hill <robin@xxxxxxxxxxxxxxx> |
/ / ) | Little Jim says .... |
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