[mythtv-users] Raid Performance Tweaking

Jens Axboe mythtv-users at kernel.dk
Sat Jul 8 10:34:35 UTC 2006


On Fri, Jul 07 2006, Blammo wrote:
> While your average current disk drive, on sustained SINGLE threaded
> reads, sits about 40MB a second, flipping to reads/writes, or 2/3/4
> simult reads/writes from different parts of the disk, and now your
> throughput on that single spindle is going to be WAY down below that
> magical 40MB number, and you will start having performance issues.

That's only really true for the 'classic' io schedulers that are work
conserving. At least on Linux, using 'cfq' or 'as' easily do a lot
better for many reading clients (or mixed read/write workload) at the
cost of slightly higher latency.

-- 
Jens Axboe



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