On Fri, Dec 07, 2001 at 05:39:53PM -0500, Chris Friesen wrote:
>
> A number of people have privately pointed out that hdparm -T doesn't
> actually go to the disk at all. Guess I should RTFM...I though that
> this was reading from the disk's cache, not linux's cache. Oops.
>
> I'm still kind of curious why raid-1 reads don't seem to get any
> performance increase over reads from a single disk. Any ideas?
For one single large sequential read, the current RAID-1 code will
not show any significant benefit over the single-disk case.
However, if you read many smaller files, or have multiple concurrent
readers, you should see a good speedup.
Try running two bonnies at the same time.
--
................................................................
: jakob@unthought.net : And I see the elder races, :
:.........................: putrid forms of man :
: Jakob Østergaard : See him rise and claim the earth, :
: OZ9ABN : his downfall is at hand. :
:.........................:............{Konkhra}...............:
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This archive was generated by hypermail 2b29 : Sat Dec 15 2001 - 21:00:15 EST